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1.
Tzanova, Alexandrina.
Linking Late Miocene-Pliocene sea surface temperatures,
terrestrial biome transitions and intensification of glaciation
using alkenone paleothermometry.
Degree: PhD, Geological Sciences, 2015, Brown University
URL: https://repository.library.brown.edu/studio/item/bdr:419502/
► This work presents novel Miocene – Pliocene (13 - 2.6 Ma) sea surface temperatures (SST) from the Mediterranean Sea, North Atlantic, South Atlantic and North…
(more)
▼ This work presents novel Miocene – Pliocene (13 - 2.6
Ma) sea surface temperatures (SST) from the Mediterranean Sea,
North Atlantic, South Atlantic and North Pacific. The focus of this
research is to contextualize major terrestrial evolutionary
transitions for this time period in the framework of emerging
Northern Hemisphere glaciation. The SSTs show a unique perspective
into the warmth and temperature dynamics of the Late Miocene, which
is not available via pre-existing, published records. In this work
we present the first continuous SST record from the Monte dei Corvi
Mediterranean section obtained through alkenone paleothermometry.
We extended the use of the alkenone proxy into Late Miocene
uplifted sections in order to capitalize on the Mediterranean’s
sensitivity to continental climate. The Mediterranean SSTs bridge
global continental biome shifts and temperature decrease in the
Late Miocene. We found that the temperature trends we first
reconstructed in the Mediterranean can be traced globally with the
SSTs we reconstructed in the North Atlantic (ODP Sites 907, 982),
South Atlantic (ODP Site 1088) and North Pacific (ODP Sites
883/884, 887) and likely represent a prelude to glaciation during a
warm period that predates large-scale glacial-interglacial cycles.
Furthermore, this work demonstrates that the first record of Late
Miocene Mediterranean SST significantly revises the timing of
Mediterranean salinity increase related to the desiccation of the
basin at 5.9 Ma. The reconstructions show that Mediterranean
salinity increased significantly above the Late Miocene mean after
6.7 Ma and not earlier as previously suggested by other authors.
Lastly, this work traces and compares SST between the Gulf of Cadiz
(IODP Site U1387) and the Mediterranean Sea in the Pliocene in
order to address the temperature component of the
Mediterranean-Atlantic connection prior to large-scale Northern
Hemisphere glaciation. The purpose of the comparison is to
reconstruct the temperature component of density of Mediterranean
inflow and outflow, which can have broad reaching implications for
global thermohaline circulation.
Advisors/Committee Members: Herbert, Timothy (Director), Clemens, Steven (Reader), Hastings, Meredith (Reader), Tullis, Jan (Reader), Wright, James (Reader).
Subjects/Keywords: paleoclimate
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APA (6th Edition):
Tzanova, A. (2015). Linking Late Miocene-Pliocene sea surface temperatures,
terrestrial biome transitions and intensification of glaciation
using alkenone paleothermometry. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:419502/
Chicago Manual of Style (16th Edition):
Tzanova, Alexandrina. “Linking Late Miocene-Pliocene sea surface temperatures,
terrestrial biome transitions and intensification of glaciation
using alkenone paleothermometry.” 2015. Doctoral Dissertation, Brown University. Accessed March 08, 2021.
https://repository.library.brown.edu/studio/item/bdr:419502/.
MLA Handbook (7th Edition):
Tzanova, Alexandrina. “Linking Late Miocene-Pliocene sea surface temperatures,
terrestrial biome transitions and intensification of glaciation
using alkenone paleothermometry.” 2015. Web. 08 Mar 2021.
Vancouver:
Tzanova A. Linking Late Miocene-Pliocene sea surface temperatures,
terrestrial biome transitions and intensification of glaciation
using alkenone paleothermometry. [Internet] [Doctoral dissertation]. Brown University; 2015. [cited 2021 Mar 08].
Available from: https://repository.library.brown.edu/studio/item/bdr:419502/.
Council of Science Editors:
Tzanova A. Linking Late Miocene-Pliocene sea surface temperatures,
terrestrial biome transitions and intensification of glaciation
using alkenone paleothermometry. [Doctoral Dissertation]. Brown University; 2015. Available from: https://repository.library.brown.edu/studio/item/bdr:419502/
2.
Theroux, Susanna.
Diversity and Ecology of Lacustrine Haptophyte Algae:
Implications for Paleothermometry.
Degree: PhD, Geological Sciences, 2013, Brown University
URL: https://repository.library.brown.edu/studio/item/bdr:320529/
► This thesis investigates the diversity and ecology of alkenone-producing haptophyte algae. Focusing on lake-dwelling haptophytes, this thesis describes the paleoclimate implications of haptophyte diversity. Additionally,…
(more)
▼ This thesis investigates the diversity and ecology of
alkenone-producing haptophyte algae. Focusing on lake-dwelling
haptophytes, this thesis describes the
paleoclimate implications of
haptophyte diversity. Additionally, this thesis describes the
isolation and cultivation of novel haptophyte species and the
characterization of their alkenone lipid profiles.
Advisors/Committee Members: Huang, Yongsong (Director), Amaral-Zettler, Linda (Director), Herbert, Timothy (Reader), Russell, James (Reader), Coolen, Marco (Reader).
Subjects/Keywords: Paleoclimate
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APA ·
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APA (6th Edition):
Theroux, S. (2013). Diversity and Ecology of Lacustrine Haptophyte Algae:
Implications for Paleothermometry. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:320529/
Chicago Manual of Style (16th Edition):
Theroux, Susanna. “Diversity and Ecology of Lacustrine Haptophyte Algae:
Implications for Paleothermometry.” 2013. Doctoral Dissertation, Brown University. Accessed March 08, 2021.
https://repository.library.brown.edu/studio/item/bdr:320529/.
MLA Handbook (7th Edition):
Theroux, Susanna. “Diversity and Ecology of Lacustrine Haptophyte Algae:
Implications for Paleothermometry.” 2013. Web. 08 Mar 2021.
Vancouver:
Theroux S. Diversity and Ecology of Lacustrine Haptophyte Algae:
Implications for Paleothermometry. [Internet] [Doctoral dissertation]. Brown University; 2013. [cited 2021 Mar 08].
Available from: https://repository.library.brown.edu/studio/item/bdr:320529/.
Council of Science Editors:
Theroux S. Diversity and Ecology of Lacustrine Haptophyte Algae:
Implications for Paleothermometry. [Doctoral Dissertation]. Brown University; 2013. Available from: https://repository.library.brown.edu/studio/item/bdr:320529/
3.
Konecky, Bronwen L.
Decadal to Orbital Scale Climate Change in the Indian Ocean
Region: Precipitation Isotopic Perspectives from East Africa and
Indonesia.
Degree: PhD, Geological Sciences, 2014, Brown University
URL: https://repository.library.brown.edu/studio/item/bdr:386126/
► Climate variability in the Indian Ocean region affects the livelihoods of billions of people. Paleoclimate reconstructions can provide critical insights into the fundamental oceanic-atmospheric processes…
(more)
▼ Climate variability in the Indian Ocean region affects
the livelihoods of billions of people.
Paleoclimate reconstructions
can provide critical insights into the fundamental
oceanic-atmospheric processes that drive long-term variations in
rainfall in this region, and how these processes might respond to
global climate change. In this dissertation, I use stable isotopes
of leaf wax compounds preserved in lake sediments to reconstruct
climatic and ecological changes in East Africa and Indonesia, two
sides of the Indian Ocean. I focus on two time periods – the late
Pleistocene (particularly the past 60,000 years) and the Common Era
(the past 2,000 years) – to investigate climate variability under a
range of mean climate states and timescales, from decadal (tens of
years) to orbital (tens of thousands of years). I find that the
reconstructed precipitation D/H ratio (δDprecip), when adequately
constrained with other geochemical and lithological tracers, can
track a variety of important climate processes in the Indian Ocean
region. On multi-decadal to centennial timescales, reconstructed
δDprecip illuminates how variations in the intensity of the Indian
and Australasian Monsoons and their relationship to remote sea
surface temperatures affected droughts and pluvials in East Africa
and southwestern Indonesia. On millennial to orbital timescales,
and particularly under the glacial boundary conditions of the late
Pleistocene, reconstructed δDprecip reveals that rainfall in East
Africa and central Indonesia was driven by major changes the locus,
strength, and spatial extent of tropical convergence. When compared
with isotope-enabled General Circulation Model experiments, it
becomes clear that on climatic and paleoclimatic timescales, the
relationships between tropical atmospheric circulation and
continental rainfall are not always stable. Spatial and temporal
patterns in reconstructed δDprecip help to evaluate several
competing hypotheses for climatic changes, and allow for an
informed assessment of the circulation changes that accompanied
major tropical climatic transitions in East Africa and Indonesia
during the late Pleistocene, the Holocene, and the 20th century.
These findings are not only critical for understanding this
poorly-studied region’s climatic history, but are also critical for
applying these lessons to questions facing the region during the
21st century.
Advisors/Committee Members: Russell, James (Director), Prell, Warren (Reader), Huang, Yongsong (Reader), Fischer, Karen (Reader), Vuille, Mathias (Reader).
Subjects/Keywords: paleoclimate
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Konecky, B. L. (2014). Decadal to Orbital Scale Climate Change in the Indian Ocean
Region: Precipitation Isotopic Perspectives from East Africa and
Indonesia. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:386126/
Chicago Manual of Style (16th Edition):
Konecky, Bronwen L. “Decadal to Orbital Scale Climate Change in the Indian Ocean
Region: Precipitation Isotopic Perspectives from East Africa and
Indonesia.” 2014. Doctoral Dissertation, Brown University. Accessed March 08, 2021.
https://repository.library.brown.edu/studio/item/bdr:386126/.
MLA Handbook (7th Edition):
Konecky, Bronwen L. “Decadal to Orbital Scale Climate Change in the Indian Ocean
Region: Precipitation Isotopic Perspectives from East Africa and
Indonesia.” 2014. Web. 08 Mar 2021.
Vancouver:
Konecky BL. Decadal to Orbital Scale Climate Change in the Indian Ocean
Region: Precipitation Isotopic Perspectives from East Africa and
Indonesia. [Internet] [Doctoral dissertation]. Brown University; 2014. [cited 2021 Mar 08].
Available from: https://repository.library.brown.edu/studio/item/bdr:386126/.
Council of Science Editors:
Konecky BL. Decadal to Orbital Scale Climate Change in the Indian Ocean
Region: Precipitation Isotopic Perspectives from East Africa and
Indonesia. [Doctoral Dissertation]. Brown University; 2014. Available from: https://repository.library.brown.edu/studio/item/bdr:386126/
4.
Tierney, Jessica Erin.
An Organic Geochemical Perspective on Tropical East African
Paleoclimate.
Degree: PhD, Geological Sciences, 2010, Brown University
URL: https://repository.library.brown.edu/studio/item/bdr:11100/
► Recent development of biomarker-based paleoclimate proxies provides new analytical capabilities through which paleoenvironmental change can be inferred. Here, I explore the utility of these organic…
(more)
▼ Recent development of biomarker-based
paleoclimate
proxies provides new analytical capabilities through which
paleoenvironmental change can be inferred. Here, I explore the
utility of these organic proxies towards solving problems of
tropical paleoclimatology within East Africa. Specifically, I apply
compound-specific deuterium/hydrogen (D/H) ratios, compound-specific
carbon isotopic ratios, and tetraether-based paleoproxies to lake
sediments from East Africa (Lake Tanganyika and Lake Challa) to
test the ability of these novel proxies to infer past changes in
the hydrological cycle, terrestrial vegetation, and surface
temperature. I demonstrate that compound-specific D/H ratios, as
measured on terrestrial higher plant leaf waxes, are a robust,
albeit complex proxy for past changes in East African hydrology
over a variety of timescales (multidecadal-orbital). The use of
glycerol dialkyl glycerol tetraethers (GDGTs) as paleothermometers
in lacustrine environments is also explored in depth. I show that
the Tetraether Index of 86 Carbons (TEX86) proxy is a reliable
proxy for lake surface temperature in Lake Tanganyika over both
short (last two millennia) and long (60,000 years) timescales.
However, TEX86 is not universally applicable in lacustrine systems.
With this in mind, I demonstrate in a surface transect study that
branched GDGTs, ubiquitous compounds in terrestrial soils, are also
abundant in East African lake sediments, and show considerable
promise as an alternative lacustrine paleothermometer. In summary,
I demonstrate that organic geochemical techniques provide powerful
new insights on East African
paleoclimate, including orbital
controls on climate, and the influence of remote, high-latitude
teleconnections. Furthermore, D/H ratios inferred from leaf waxes
and tetraether-inferred changes in temperature provide quantitative
paleodata suitable for proxy-model comparison.
Advisors/Committee Members: Russell, James (Director), Herbert, Timothy (Reader), Huang, Yongsong (Reader), Saal, Alberto (Reader), Oppo, Delia (Reader).
Subjects/Keywords: paleoclimate
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Tierney, J. E. (2010). An Organic Geochemical Perspective on Tropical East African
Paleoclimate. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:11100/
Chicago Manual of Style (16th Edition):
Tierney, Jessica Erin. “An Organic Geochemical Perspective on Tropical East African
Paleoclimate.” 2010. Doctoral Dissertation, Brown University. Accessed March 08, 2021.
https://repository.library.brown.edu/studio/item/bdr:11100/.
MLA Handbook (7th Edition):
Tierney, Jessica Erin. “An Organic Geochemical Perspective on Tropical East African
Paleoclimate.” 2010. Web. 08 Mar 2021.
Vancouver:
Tierney JE. An Organic Geochemical Perspective on Tropical East African
Paleoclimate. [Internet] [Doctoral dissertation]. Brown University; 2010. [cited 2021 Mar 08].
Available from: https://repository.library.brown.edu/studio/item/bdr:11100/.
Council of Science Editors:
Tierney JE. An Organic Geochemical Perspective on Tropical East African
Paleoclimate. [Doctoral Dissertation]. Brown University; 2010. Available from: https://repository.library.brown.edu/studio/item/bdr:11100/

Oregon State University
5.
Shakun, Jeremy D., 1981-.
Analyzing large paleoclimate datasets : implications for past and future climate change.
Degree: PhD, Geology, 2010, Oregon State University
URL: http://hdl.handle.net/1957/18836
► This dissertation presents the results of statistical analyses of large climate datasets from two time intervals – the 20th century instrumental record and the proxy…
(more)
▼ This dissertation presents the results of statistical analyses of large climate datasets from two time intervals – the 20th century instrumental record and the proxy record of the last deglaciation – in order to understand the forcings and mechanisms of past climate variability.
A longstanding question in climate dynamics concerns the origin of Pacific decadal variability (PDV). This issue is addressed by calculating the Southern Hemisphere equivalent of the Pacific Decadal Oscillation (PDO) index from Pacific sea surface temperature (SST) anomalies over the 20th century, which is found to be similar to its Northern Hemisphere counterpart. The Northern and Southern PDO indices both exhibit pronounced seasonality in autocorrelation with interannual persistence of winter SST anomalies despite their absence during the intervening summer, suggesting a role for reemergence. These two indices can be reasonably well reproduced using a first-order autoregressive model forced by the El Niño-Southern Oscillation, suggesting that Pacific decadal variability on both sides of the equator may largely be a reddened response to tropical forcing.
Over 100 high-resolution proxy climate time series spanning parts or all of the Last Glacial Maximum (LGM) to Holocene interval are analyzed to characterize spatiotemporal patterns of glacial-interglacial climate change. Peak glacial and
interglacial conditions occurred statistically synchronously between the Northern (22.1 ± 4.3 ka and 8.0 ± 3.2 ka) and Southern (22.3 ± 3.6 ka and 7.4 ± 3.7 ka) Hemispheres, suggesting that the hemispheres were synchronized by greenhouse gases, local insolation, and/or ocean circulation. Global cooling during the LGM was likely ≥4.9°C, but only ~0.6°C during the Younger Dryas. Younger Dryas climate anomalies exhibit a general hemispheric seesaw pattern with the largest negative anomalies in the high northern latitudes, mixed sign anomalies in the low latitudes, and modest positive anomalies in the high southern latitudes, consistent with an ocean circulation driver of this event. Empirical Orthogonal Function analysis of 71 records from 19-11 ka indicates that 72% of deglacial climate variability can be explained by two modes. The first mode (61% of the variance) shows a globally near-uniform signal and its associated principal component is strongly correlated with ice-core records of atmospheric CO₂. The second mode (11% of the variance) displays a more variable spatial pattern and its principal component parallels variations in Atlantic Meridional Overturning Circulation (AMOC) strength.
Averaging 77 calibrated proxy temperature records over the last deglaciation indicates that global mean temperature was highly correlated and varied nearly in phase with the rise in CO₂, which differs from ice-core studies suggesting Antarctic temperature led CO₂. This result thus suggests a primary role for CO₂ in driving deglacial warming and the global deglaciation. Northern and Southern Hemisphere mean temperature time series both bear the imprint of CO₂…
Advisors/Committee Members: Clark, Peter U. (advisor), Brook, Edward J. (committee member).
Subjects/Keywords: paleoclimate; Paleoclimatology
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Shakun, Jeremy D., 1. (2010). Analyzing large paleoclimate datasets : implications for past and future climate change. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/18836
Chicago Manual of Style (16th Edition):
Shakun, Jeremy D., 1981-. “Analyzing large paleoclimate datasets : implications for past and future climate change.” 2010. Doctoral Dissertation, Oregon State University. Accessed March 08, 2021.
http://hdl.handle.net/1957/18836.
MLA Handbook (7th Edition):
Shakun, Jeremy D., 1981-. “Analyzing large paleoclimate datasets : implications for past and future climate change.” 2010. Web. 08 Mar 2021.
Vancouver:
Shakun, Jeremy D. 1. Analyzing large paleoclimate datasets : implications for past and future climate change. [Internet] [Doctoral dissertation]. Oregon State University; 2010. [cited 2021 Mar 08].
Available from: http://hdl.handle.net/1957/18836.
Council of Science Editors:
Shakun, Jeremy D. 1. Analyzing large paleoclimate datasets : implications for past and future climate change. [Doctoral Dissertation]. Oregon State University; 2010. Available from: http://hdl.handle.net/1957/18836

University of California – Santa Cruz
6.
Wu, Fei.
Insight Into Climate Variations Of The Early Middle Eocene: High-Resolution Benthic Stable Isotope Data From Site 1408, Newfoundland Ridge.
Degree: Earth Science, 2015, University of California – Santa Cruz
URL: http://www.escholarship.org/uc/item/6tv6g2dm
► The middle Eocene is a transitional period from the greenhouse early Eocene to the ice-house Eocene-Oligocene Transition. Due to lack of high-resolution records, the details…
(more)
▼ The middle Eocene is a transitional period from the greenhouse early Eocene to the ice-house Eocene-Oligocene Transition. Due to lack of high-resolution records, the details of this long-term cooling trend are not clear. Low-resolution atmospheric CO2 records suggest declining, but highly variable levels during the middle Eocene which might have driven transient climate variations. However, high-resolution stable isotope records are lacking to document the true climate patterns over this period. Moreover, orbital scale climate reconstructions are essential for reconciling how the sensitivity to orbital forcing changed, if at all, as the greenhouse boundary conditions changes from the early to late Eocene. High-resolution isotope and trace metal records are also essential for constraining the evolution of northern hemispheric sea-ice and continental glaciation as well as North Atlantic Deep Water in the middle Eocene. To address these shortcomings, I have generated high-resolution stable isotope and trace element data for a site in the northern Atlantic on Newfoundland Ridge (IODP, Site 1408). The records span Chron20r (46.4~43.8 Ma), and are the first orbital-scale stable isotope records for the early middle Eocene. With the exception of the uppermost portion of the section, the δ18O data indicate gradual cooling of 0.8~1.2 ⁰C/Myr over much of the section from 46.4Ma to 44.3 Ma which is consistent with the long-term global cooling trend. This is accompanied by a decrease in Mg/Ca records, while the paired δ18O-Mg/Ca analysis shows no pronounced shift in δ18Osw implying no variation in ice volume. In the upper part of the section (44.3~43.8 Ma), the δ18O shows a slight reversal consistent with warming, while Mg/Ca proxy indicates a continuous cooling. One hypothesis for the apparent between the two records is that the water mass reflects changes in the salinity of local bottom water and a possible shift toward a higher-latitude, cooler and less salty water source. In addition, clear astronomically paced cycles are observed in the stable isotopic and lithological records, and spectral analysis demonstrate that the cycles are dominated by 41-kyr obliquity cycles, a unique feature of Paleocene-Eocene records which are typically dominated by precession and eccentricity. This could reflect either shift in orbital configuration (low eccentricity signals or change in Earth’s tilt), or gradual climatic variation toward the ice-house world in the middle Eocene. Interbasin δ13C gradient reveals relatively low δ13C values at this northern Atlantic site compared with records from the Southern Ocean, indicating the meridional circulation was northward and/or North Atlantic Deep Water formation was absent or weak during this time.
Subjects/Keywords: Paleoclimate science
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Wu, F. (2015). Insight Into Climate Variations Of The Early Middle Eocene: High-Resolution Benthic Stable Isotope Data From Site 1408, Newfoundland Ridge. (Thesis). University of California – Santa Cruz. Retrieved from http://www.escholarship.org/uc/item/6tv6g2dm
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wu, Fei. “Insight Into Climate Variations Of The Early Middle Eocene: High-Resolution Benthic Stable Isotope Data From Site 1408, Newfoundland Ridge.” 2015. Thesis, University of California – Santa Cruz. Accessed March 08, 2021.
http://www.escholarship.org/uc/item/6tv6g2dm.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wu, Fei. “Insight Into Climate Variations Of The Early Middle Eocene: High-Resolution Benthic Stable Isotope Data From Site 1408, Newfoundland Ridge.” 2015. Web. 08 Mar 2021.
Vancouver:
Wu F. Insight Into Climate Variations Of The Early Middle Eocene: High-Resolution Benthic Stable Isotope Data From Site 1408, Newfoundland Ridge. [Internet] [Thesis]. University of California – Santa Cruz; 2015. [cited 2021 Mar 08].
Available from: http://www.escholarship.org/uc/item/6tv6g2dm.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wu F. Insight Into Climate Variations Of The Early Middle Eocene: High-Resolution Benthic Stable Isotope Data From Site 1408, Newfoundland Ridge. [Thesis]. University of California – Santa Cruz; 2015. Available from: http://www.escholarship.org/uc/item/6tv6g2dm
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of California – Berkeley
7.
Englebrecht, Amy.
Late Holocene Climate Change on Isla Isabela, Gulf of California.
Degree: Earth & Planetary Science, 2010, University of California – Berkeley
URL: http://www.escholarship.org/uc/item/5p38g9pj
► Sediments from the crater lake on Isla Isabela, in the southern Gulf of California, were used to investigate precipitation and evaporation changes in this region…
(more)
▼ Sediments from the crater lake on Isla Isabela, in the southern Gulf of California, were used to investigate precipitation and evaporation changes in this region over the past 6,000 years. Stable isotopes of oxygen and carbon provided a proxy record of Pacific climate variability on timescales ranging from decadal to millennial. Strength in the dominant periodicities of the Pacific Decadal Oscillation appears to have been intermittent over the past two millennia, suggesting changes in Pacific forcing not previously recognized. In addition, productivity in the lake varies on timescales that suggests a link between increased productivity and solar maxima. Although the precise role of solar activity on climate variations remains unclear, this data represents a convergence of model output with empirical evidence over the past millennium. Over the late Holocene, it appears that there have been a number of pronounced dry periods that generally coincide with cold sea surface temperatures in the eastern Pacific, and generally dry conditions across western North America.
Subjects/Keywords: Paleoclimate science
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Englebrecht, A. (2010). Late Holocene Climate Change on Isla Isabela, Gulf of California. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/5p38g9pj
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Englebrecht, Amy. “Late Holocene Climate Change on Isla Isabela, Gulf of California.” 2010. Thesis, University of California – Berkeley. Accessed March 08, 2021.
http://www.escholarship.org/uc/item/5p38g9pj.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Englebrecht, Amy. “Late Holocene Climate Change on Isla Isabela, Gulf of California.” 2010. Web. 08 Mar 2021.
Vancouver:
Englebrecht A. Late Holocene Climate Change on Isla Isabela, Gulf of California. [Internet] [Thesis]. University of California – Berkeley; 2010. [cited 2021 Mar 08].
Available from: http://www.escholarship.org/uc/item/5p38g9pj.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Englebrecht A. Late Holocene Climate Change on Isla Isabela, Gulf of California. [Thesis]. University of California – Berkeley; 2010. Available from: http://www.escholarship.org/uc/item/5p38g9pj
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
8.
Nichols, Jonathan E.
Reconstructing Holocene Hydroclimate in Eastern North
America from Ombrotrophic Peatland Sediments.
Degree: PhD, Geological Sciences, 2010, Brown University
URL: https://repository.library.brown.edu/studio/item/bdr:11051/
► Ombrotrophic peatlands are a huge, largely untapped resource in the study of continental paleoclimate. In this dissertation I develop and implement novel proxies for climate…
(more)
▼ Ombrotrophic peatlands are a huge, largely untapped
resource in the study of continental
paleoclimate. In this
dissertation I develop and implement novel proxies for climate
parameters to be used in ombrotrophic sediments. Further, I
synthesize continental and marine records of
paleoclimate derived
using both novel and well-established methods of reconstruction to
define mechanisms of climate change during the Holocene and to test
hypotheses about ocean-atmosphere interactions. I present novel
indicators of peatland hydrologic change using the abundances and
stable isotope ratios of specific organic compounds. Three novel
methods for
paleoclimate reconstruction are presented and applied
to ombrotrophic sediments from several locations in North America
and Europe. The Sphagnum/Vascular Ratio (SVR) is a paleoecological
indicator based on leaf wax biomarkers, which takes advantage of
differential n-alkane distributions of the wet-loving Sphagnum and
dry-tolerant ericads. Evaporation from a peatland surface can be
quantitatively modeled using compound-specific stable isotope
ratios of plant biomarkers. The contrast in hydrogen isotope ratios
between the Sphagnum biomarkers – derived from evaporatively evolved
surface water – and vascular plant biomarkers – derived from
unevaporated peatland water – can be used to calculate the amount of
evaporation at the peatland surface. The carbon isotope ratios of
Sphagnum biomarkers can be used to estimate the amount of
methane-derived CO2 used by Sphagnum. The symbiotic methanotrophic
bacteria, which provide Sphagnum with CO2, are most active (i.e.,
providing 20% of the Sphagnum's CO2) when the peatland surface is
saturated, and dormant when it is dry. In this way, the amount of
methane derived CO2, can be calculated from the δ13C of Sphagnum
biomarkers.The application of these new proxies to peatland
sediments has yielded new records of hydrologic change at
sub-centennial to decadal resolution from areas in eastern North
America and arctic Norway. In the North American sites, an abrupt,
widespread shift to drier conditions is observed at the
mid-Holocene (~5500 yr). This is observation, while consistent with
other, low resolution, records from this region, it is opposite of
the western parts of the continent, which experienced a wetter late
Holocene
Advisors/Committee Members: Huang, Yongsong (Director), Herbert, Timothy (Reader), Mustard, John (Reader), Russell, James (Reader), Booth, Robert (Reader).
Subjects/Keywords: Holocene paleoclimate
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APA (6th Edition):
Nichols, J. E. (2010). Reconstructing Holocene Hydroclimate in Eastern North
America from Ombrotrophic Peatland Sediments. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:11051/
Chicago Manual of Style (16th Edition):
Nichols, Jonathan E. “Reconstructing Holocene Hydroclimate in Eastern North
America from Ombrotrophic Peatland Sediments.” 2010. Doctoral Dissertation, Brown University. Accessed March 08, 2021.
https://repository.library.brown.edu/studio/item/bdr:11051/.
MLA Handbook (7th Edition):
Nichols, Jonathan E. “Reconstructing Holocene Hydroclimate in Eastern North
America from Ombrotrophic Peatland Sediments.” 2010. Web. 08 Mar 2021.
Vancouver:
Nichols JE. Reconstructing Holocene Hydroclimate in Eastern North
America from Ombrotrophic Peatland Sediments. [Internet] [Doctoral dissertation]. Brown University; 2010. [cited 2021 Mar 08].
Available from: https://repository.library.brown.edu/studio/item/bdr:11051/.
Council of Science Editors:
Nichols JE. Reconstructing Holocene Hydroclimate in Eastern North
America from Ombrotrophic Peatland Sediments. [Doctoral Dissertation]. Brown University; 2010. Available from: https://repository.library.brown.edu/studio/item/bdr:11051/

University of California – Berkeley
9.
Bhattacharya, Tripti.
Causes and Impacts of Rainfall Variability In Central Mexico on Multiple Timescales.
Degree: Geography, 2016, University of California – Berkeley
URL: http://www.escholarship.org/uc/item/04j0w63x
► The eastern sector of Mexico’s Trans-Mexican Volcanic Belt is a semi-arid region, where interannual rainfall variability is significantly stresses regional water resources and the livelihood…
(more)
▼ The eastern sector of Mexico’s Trans-Mexican Volcanic Belt is a semi-arid region, where interannual rainfall variability is significantly stresses regional water resources and the livelihood of millions. The region is linked to a broader summertime rainfall regime known as the North American Monsoon (NAM). My dissertation uses multiple lines of evidence, from geochemistry to climate model output, to understand the causes of long-term droughts in this region.My first dissertation chapter uses instrumental data to diagnose the causes of El Niño-induced droughts in Mexico. This work explores the mechanisms responsible for rainfall changes over Central Mexico during the developing versus decaying phase of an El Niño event. This study was the first to demonstrate the importance of moisture transport anomalies in reducing rainfall in highland Mexico during the decay phase of an El Niño. My second dissertation chapter uses the oxygen stable isotope ratios (δ18O) of lacustrine carbonates as well as elemental geochemistry to reconstruct late Holocene drought in Central Mexico. This sub-centennially resolved record is the first to identify a significant dry interval in central Mexico from 1300-1100 cal yr. B.P., which may be temporally coherent with increased drought frequencies recorded on the Yucatan Peninsula. These results also hint at a role for climate change in regional prehistoric cultural changes at the nearby site of Cantona. My third dissertation chapter explores impacts of late Holocene droughts on the terrestrial ecosystems in Central Mexico. I reconstructed past vegetation and fire dynamics from pollen and microscopic charcoal, and compared these data to our stable-isotope based climate reconstruction and regional archaeological records. My fourth chapter is an exploration of the causes of centennial-scale across Mexico and Central America in the late Holocene. This work identifies the spatiotemporal patterns of late Holocene drought by synthesizing Mesoamerican proxy records. It presents a new hypothesis pointing to the role of changes in Atlantic circulation in causing droughts in Mesoamerica. Finally, I synthesize the knowledge in each of the dissertation chapters and point to avenues of future research.
Subjects/Keywords: Paleoclimate science; Paleoecology; Drought; Mesoamerica; Paleoclimate
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MLA ·
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APA (6th Edition):
Bhattacharya, T. (2016). Causes and Impacts of Rainfall Variability In Central Mexico on Multiple Timescales. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/04j0w63x
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bhattacharya, Tripti. “Causes and Impacts of Rainfall Variability In Central Mexico on Multiple Timescales.” 2016. Thesis, University of California – Berkeley. Accessed March 08, 2021.
http://www.escholarship.org/uc/item/04j0w63x.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bhattacharya, Tripti. “Causes and Impacts of Rainfall Variability In Central Mexico on Multiple Timescales.” 2016. Web. 08 Mar 2021.
Vancouver:
Bhattacharya T. Causes and Impacts of Rainfall Variability In Central Mexico on Multiple Timescales. [Internet] [Thesis]. University of California – Berkeley; 2016. [cited 2021 Mar 08].
Available from: http://www.escholarship.org/uc/item/04j0w63x.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bhattacharya T. Causes and Impacts of Rainfall Variability In Central Mexico on Multiple Timescales. [Thesis]. University of California – Berkeley; 2016. Available from: http://www.escholarship.org/uc/item/04j0w63x
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
10.
Lambert, Nolen Frank.
A multiproxy high resolution paleoclimate study of Lake Mirabad, Iran.
Degree: 2011, California State University, Long Beach
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1490303
► The upper 200 cm of a 7.2 m long sediment core from Lake Mirabad, Iran, were examined for oxygen and carbon isotope values, trace-elements…
(more)
▼ The upper 200 cm of a 7.2 m long sediment core from Lake Mirabad, Iran, were examined for oxygen and carbon isotope values, trace-elements and carbon nitrogen ratios in order to create a climate record for the last 1500 years. The chronology (A.D. 566-1943) was established using AMS dating. Evaporative enrichment was secondary to atmospheric vapor exchange and/or seasonality of precipitation as a forcing mechanism on δ18O ratios throughout most of this period. Temperatures and effective moisture increased during the Medieval Climate Anomaly. The Spörer Minimum, at the beginning of the Little Ice Age (LIA), brought lower temperatures and a decrease in effective moisture which continued throughout the LIA, resembling climatic conditions during the last glacial maximum. The Maunder Minimum, at the end of the LIA, was accompanied by shifts in the seasonality of precipitation. Evaporative enrichment became the dominant forcing mechanism from A.D. 1850 onward as lake levels increased.
Subjects/Keywords: Paleoclimate Science; Geochemistry
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Lambert, N. F. (2011). A multiproxy high resolution paleoclimate study of Lake Mirabad, Iran. (Thesis). California State University, Long Beach. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1490303
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lambert, Nolen Frank. “A multiproxy high resolution paleoclimate study of Lake Mirabad, Iran.” 2011. Thesis, California State University, Long Beach. Accessed March 08, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=1490303.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lambert, Nolen Frank. “A multiproxy high resolution paleoclimate study of Lake Mirabad, Iran.” 2011. Web. 08 Mar 2021.
Vancouver:
Lambert NF. A multiproxy high resolution paleoclimate study of Lake Mirabad, Iran. [Internet] [Thesis]. California State University, Long Beach; 2011. [cited 2021 Mar 08].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1490303.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lambert NF. A multiproxy high resolution paleoclimate study of Lake Mirabad, Iran. [Thesis]. California State University, Long Beach; 2011. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1490303
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
11.
White, Sarah Marie.
Millennial-scale Variability to 735 ka| High-resolution Climate Records from Santa Barbara Basin, CA.
Degree: 2013, University of California, Davis
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1530014
► Determining the ultimate cause and effect of millennial-scale climate variability remains an outstanding problem in paleoclimatology, partly due to the lack of high- resolution…
(more)
▼ Determining the ultimate cause and effect of millennial-scale climate variability remains an outstanding problem in paleoclimatology, partly due to the lack of high- resolution records extending beyond the last glacial period. New cores from Santa Barbara Basin provide ∼5000 year "windows" of climate with ∼50-year resolution dating to ∼293 ka (the MIS 8.6-8.5 transition), ∼460 ka (MIS 12), and ∼735 ka (MIS 18). These records span the Late Pleistocene, during which the 100-kyr cycle gained power in global climate records and the magnitude of glacial-interglacial cyclicity increased. Thus, these records provide a test of the dependence of millennial-scale behavior on variations in glacial-interglacial cyclicity. Planktonic foraminiferal δ 18O indicates that millennial-scale variability is present in all three intervals, and is similar to that during MIS 3. Stadial <i>G. bulloides </i> δ18O values were 2.75-1.75 ‰ (mean 2.25 ‰) and interstadial values were 1.75-0.5 ‰ (mean 1 ‰), with rapid interstadial initiations of 1-2 ‰, as in MIS 3. Interstadials were ∼300-1300 years long and spaced ∼750-1500 years apart, consistent with MIS 3 interstadial durations. Upwelling increased during interstadials, but did not vary synchronously with surface water temperatures, again similar to MIS 3. These high-resolution records provide evidence that millennial-scale variability was an inherent feature of glacial climates in the Northern Hemisphere throughout the past 735 ka.
Subjects/Keywords: Paleoclimate Science; Geochemistry
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
White, S. M. (2013). Millennial-scale Variability to 735 ka| High-resolution Climate Records from Santa Barbara Basin, CA. (Thesis). University of California, Davis. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1530014
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
White, Sarah Marie. “Millennial-scale Variability to 735 ka| High-resolution Climate Records from Santa Barbara Basin, CA.” 2013. Thesis, University of California, Davis. Accessed March 08, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=1530014.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
White, Sarah Marie. “Millennial-scale Variability to 735 ka| High-resolution Climate Records from Santa Barbara Basin, CA.” 2013. Web. 08 Mar 2021.
Vancouver:
White SM. Millennial-scale Variability to 735 ka| High-resolution Climate Records from Santa Barbara Basin, CA. [Internet] [Thesis]. University of California, Davis; 2013. [cited 2021 Mar 08].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1530014.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
White SM. Millennial-scale Variability to 735 ka| High-resolution Climate Records from Santa Barbara Basin, CA. [Thesis]. University of California, Davis; 2013. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1530014
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
12.
Nonu, Mounga E.
Eagle Lake Climate Change during the Holocene and during the Last 100 Years.
Degree: 2018, California State University, Long Beach
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10638771
► Multi-proxy comparative analyses of sediment from Eagle Lake, including TOC, δ13C and δ15N composition of bulk organic material, n-alkane distribution, and biogenic silica, was…
(more)
▼ Multi-proxy comparative analyses of sediment from Eagle Lake, including TOC, δ13C and δ15N composition of bulk organic material, n-alkane distribution, and biogenic silica, was used to document hydroclimatic changes during the early and late Holocene. Eagle Lake is currently located near the transition zone of the North American Precipitation Dipole, with the timing of precipitation showing a winter-wet scenario common to the Pacific Northwest, but overall precipitation (e.g. aridity) showing a Pacific Southwest pattern. The width and position of this transition is poorly constrained during the Holocene and is hypothesized to have migrated, particularly in response to the North American Monsoon. Eagle Lake is thus ideal in providing insights to the past positions of the dipole. Multi-proxy analyses results in differences between the early and late Holocene at Eagle Lake. TOC is lower in the early Holocene, however C:N ratios are much more variable indicating a transition from algal source material to terrestrial and back to algal material prior to the Mazama ash. There are also greater fluctuations of biogenic silica during the early Holocene, suggesting rapid changes in productivity. To place these Holocene changes within the context of known climatic and anthropogenic conditions of the 20th century, a ~100 year record of hydrologic change is compared to drought and lake-level drops induced by the formation of the Bly Tunnel. Importantly, the effects of the tunnel on lake level is superimposed on the 1930s drought, making it difficult to disentangle the two impacts. However, the TOC and C:N ratios clearly mirror variations in lake level suggesting that they are effective indicators of Holocene variations.
Subjects/Keywords: Geology; Paleoclimate science
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Nonu, M. E. (2018). Eagle Lake Climate Change during the Holocene and during the Last 100 Years. (Thesis). California State University, Long Beach. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10638771
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Nonu, Mounga E. “Eagle Lake Climate Change during the Holocene and during the Last 100 Years.” 2018. Thesis, California State University, Long Beach. Accessed March 08, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=10638771.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nonu, Mounga E. “Eagle Lake Climate Change during the Holocene and during the Last 100 Years.” 2018. Web. 08 Mar 2021.
Vancouver:
Nonu ME. Eagle Lake Climate Change during the Holocene and during the Last 100 Years. [Internet] [Thesis]. California State University, Long Beach; 2018. [cited 2021 Mar 08].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10638771.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nonu ME. Eagle Lake Climate Change during the Holocene and during the Last 100 Years. [Thesis]. California State University, Long Beach; 2018. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10638771
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Victoria University of Wellington
13.
Lowry, Daniel P.
Deglacial climate and ice sheet evolution of the Ross Embayment, Antarctica.
Degree: 2019, Victoria University of Wellington
URL: http://hdl.handle.net/10063/8593
► Reconstructing past grounding-line evolution can help inform future sea level projections by constraining marine ice sheet sensitivities to changes in climate. The Ross Embayment, the…
(more)
▼ Reconstructing past grounding-line evolution can help inform future sea level projections by constraining marine ice sheet sensitivities to changes in climate. The Ross Embayment, the largest sector of Antarctica, experienced substantial grounding-line retreat since the Last Glacial Maximum. However, different interpretations for the timing and spatial pattern of deglacial grounding-line retreat in this region persist, suggesting either very high or low sensitivity to external forcings. Complicating matters is the sparse
paleoclimate record, which is limited spatially and temporally. In this thesis, I address these issues by analysing the output of two transient climate simulations in relation to Antarctic ice core and marine sediment records, and performing and analysing the largest ensemble to date of regional ice sheet model simulations of the last deglaciation in the Ross Sea. The climate models and
paleoclimate proxy records exhibit key differences in the timing, magnitude and duration of millennial-scale climate change events through the deglacial period. Using this diverse set of deglacial climate trajectories as ocean and atmosphere forcings, the ice sheet model ensemble produces a wide range of ice sheet responses, supporting the view that external forcings are the main drivers of past grounding-line retreat in the region. The simulations demonstrate that atmospheric conditions early in the deglacial period can enhance or diminish ice sheet sensitivity to rising ocean temperatures, thereby controlling the initial timing and spatial pattern of grounding-line retreat. Through the Holocene, grounding-line position is more sensitive to sub-shelf melt rates as the ocean cavity below the ice shelf expands. Model parameters that control the physical properties of the bed, deformation of the continental shelf, and rheological properties of the ice strongly influence the sensitivity of ice sheets to external forcing. Basin-wide differences in these forcings, driven by oceanic and atmospheric circulation, and spatial heterogeneity of bed properties likely contribute to the asynchronous pattern of retreat in the eastern and western parts of the embayment, as indicated by marine and terrestrial proxy records.
Advisors/Committee Members: Golledge, Nicholas, Bertler, Nancy.
Subjects/Keywords: Antarctica; Deglaciation; Paleoclimate
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lowry, D. P. (2019). Deglacial climate and ice sheet evolution of the Ross Embayment, Antarctica. (Doctoral Dissertation). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/8593
Chicago Manual of Style (16th Edition):
Lowry, Daniel P. “Deglacial climate and ice sheet evolution of the Ross Embayment, Antarctica.” 2019. Doctoral Dissertation, Victoria University of Wellington. Accessed March 08, 2021.
http://hdl.handle.net/10063/8593.
MLA Handbook (7th Edition):
Lowry, Daniel P. “Deglacial climate and ice sheet evolution of the Ross Embayment, Antarctica.” 2019. Web. 08 Mar 2021.
Vancouver:
Lowry DP. Deglacial climate and ice sheet evolution of the Ross Embayment, Antarctica. [Internet] [Doctoral dissertation]. Victoria University of Wellington; 2019. [cited 2021 Mar 08].
Available from: http://hdl.handle.net/10063/8593.
Council of Science Editors:
Lowry DP. Deglacial climate and ice sheet evolution of the Ross Embayment, Antarctica. [Doctoral Dissertation]. Victoria University of Wellington; 2019. Available from: http://hdl.handle.net/10063/8593

Queens University
14.
Miller, Cody.
Cenozoic Evolution of the Nullarbor Plain Paleokarst, Southern Australia
.
Degree: Geological Sciences and Geological Engineering, 2012, Queens University
URL: http://hdl.handle.net/1974/7319
► The Nullarbor Plain in southern Australia is an uplifted succession of Cenozoic marine carbonates whose surface has been exposed for ~14 m.y. This succession of…
(more)
▼ The Nullarbor Plain in southern Australia is an uplifted succession of Cenozoic marine carbonates whose surface has been exposed for ~14 m.y. This succession of limestones, particularly in the surfical middle Miocene Nullarbor Limestone, hosts a complex and prolonged record of meteoric diagenesis. Alteration took place through 3 broad phases of diagenesis encompassing 8 stages that are interpreted to have taken place over a dramatic regional climate change. Phase 1 diagenesis occurred under a humid middle Miocene climate and involved mineralogical equilibration with meteoric fluids, calcite cementation, widespread microkarst, and regional lacustrine and palustrine sedimentation producing copious amounts of ooids. These ooids are interpreted to have formed via microbial secretions and sediment aggradation over multiple seasons of changing rainfall and soil hydration states. Cortical laminations are proposed to represent microbial mucus envelopes during wet seasons alternating with dehydration during dry seasons and precipitation of fibrous clay minerals and CaCO3 that preserve the pre-existing microbial fabrics. Phase 2 alterations took place under a more temperate climate from the late Miocene to Pliocene with a later pronounced humid interlude. This phase encompassed ~8 m.y. and was dominated by karst process where deep cave dissolution occurred at depressed water tables related to globally low sea levels and later shallow caves developed during a Pliocene sea level highstand. Phase 3 has occurred since the late Pliocene and is indicative of the onset of modern semi-arid climatic conditions. This final phase involved the creation of subsoil hollows filled with blackened limestone lithoclasts, deep and shallow dolines, and indurated pedogenic calcrete that now forms much of the surface of the Nullarbor Plain. Blackened limestone clasts have been shown to form at the B-C boundary in soil profiles where roots have their cellular structures calcified and during this process incorporate trapped organics that ultimately produce the distinctive black colouration. The importance of this comprehensive diagenetic record is its direct applicability to the understanding of ancient subaerial exposure surfaces.
Subjects/Keywords: Paleoclimate
;
Carbonate Diagenesis
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Miller, C. (2012). Cenozoic Evolution of the Nullarbor Plain Paleokarst, Southern Australia
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/7319
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Miller, Cody. “Cenozoic Evolution of the Nullarbor Plain Paleokarst, Southern Australia
.” 2012. Thesis, Queens University. Accessed March 08, 2021.
http://hdl.handle.net/1974/7319.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Miller, Cody. “Cenozoic Evolution of the Nullarbor Plain Paleokarst, Southern Australia
.” 2012. Web. 08 Mar 2021.
Vancouver:
Miller C. Cenozoic Evolution of the Nullarbor Plain Paleokarst, Southern Australia
. [Internet] [Thesis]. Queens University; 2012. [cited 2021 Mar 08].
Available from: http://hdl.handle.net/1974/7319.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Miller C. Cenozoic Evolution of the Nullarbor Plain Paleokarst, Southern Australia
. [Thesis]. Queens University; 2012. Available from: http://hdl.handle.net/1974/7319
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
15.
Ice, Bryan w.
RECONSTRUCTING THE PALEOCLIMATE OF THE MIDDLE DEVONIAN USING
MARCELLUS SHALE GEOCHEMICAL SIGNATURES, SENECA FALLS, NY.
Degree: MS, College of Arts and Sciences / Department of
Geology, 2019, Kent State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=kent1566402595586501
► The Marcellus Shale has long been an important economic resource in the oil and gas industry here in the United States. The advent of unconventional…
(more)
▼ The Marcellus Shale has long been an important
economic resource in the oil and gas industry here in the United
States. The advent of unconventional drilling techniques has
ultimately developed the Marcellus shale and its three members
(Cherry Valley Limestone, Union Springs, and Oatka Creek) into a
fully explored black shale play. While economically important, the
climatic and depositional conditions which allowed for the
deposition and formation of the Marcellus Shale are not fully
understood, and to this day is a topic of debate in the geologic
sciences. This research aims to create a better understanding of
the depositional conditions, through the use of geochemical and
mineralogical proxies. Climatic conditions determined through
geochemical proxies include an analysis of the major element
abundances, incorporation of the chemical index of alteration(CIA),
and a ratio of K relative to Al. Depositional conditions of the
Appalachian basin have been determined using the redox sensitive
trace element proxies of V/Cr and V/(V+Ni). In Terms of
mineralogical proxies, a relative ratio of kaolinite against illite
has been incorporated to further validate the claims of the major
element proxies. The Marcellus Formation is Middle Devonian in age,
and underlies a large area, ranging from western and central New
York, Pennsylvania, West Virginia, and Eastern Ohio. Within this
research the Union Springs Member of the Marcellus Shale has been
examined in depth using multiple geochemical proxies in order to
infer the climatic and depositional conditions which were favorable
for the formation of an economically important black shale play.
The study site for this research is in Seneca Falls, NY, wherein
three stratigraphic profiles have been collected at a quarry with
fresh exposures of the Union Springs Member. This research aims to
identify the relative climate in terms of arid vs humid, as well as
determine the redox conditions of the depositional basin during the
time of deposition. In order to complete this research, several lab
instruments have been utilized to obtain geochemical and
mineralogical data. The ED-XRF has been used to determine major,
minor, and trace element concentrations and fluctuations throughout
the stratigraphic profiles. An Elemental Analyzer has been used to
determine total organic carbon, and mineralogy has been partially
obtained using an XRD, as well as visible derivative spectroscopy
techniques (VDS). An additional goal to this research is to improve
the application of visible derivative spectroscopy (VDS) to black
shale systems. VDS is a technique which utilizes the reflectance of
mineral properties in the visible light range (400-700nm). VDS has
been widely applied to several geologic and aquatic systems, most
recently in tracking harmful algal bloom cell counts. However, the
use of VDS has not been widely applied to black shale systems, and
some challenges are presented in doing so. Therefore, a portion of
this research is to develop improvements in the application to help
yield robust analysis…
Advisors/Committee Members: Williams, Jeremy (Advisor).
Subjects/Keywords: Geology; Paleoclimate Science
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ice, B. w. (2019). RECONSTRUCTING THE PALEOCLIMATE OF THE MIDDLE DEVONIAN USING
MARCELLUS SHALE GEOCHEMICAL SIGNATURES, SENECA FALLS, NY. (Masters Thesis). Kent State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=kent1566402595586501
Chicago Manual of Style (16th Edition):
Ice, Bryan w. “RECONSTRUCTING THE PALEOCLIMATE OF THE MIDDLE DEVONIAN USING
MARCELLUS SHALE GEOCHEMICAL SIGNATURES, SENECA FALLS, NY.” 2019. Masters Thesis, Kent State University. Accessed March 08, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=kent1566402595586501.
MLA Handbook (7th Edition):
Ice, Bryan w. “RECONSTRUCTING THE PALEOCLIMATE OF THE MIDDLE DEVONIAN USING
MARCELLUS SHALE GEOCHEMICAL SIGNATURES, SENECA FALLS, NY.” 2019. Web. 08 Mar 2021.
Vancouver:
Ice Bw. RECONSTRUCTING THE PALEOCLIMATE OF THE MIDDLE DEVONIAN USING
MARCELLUS SHALE GEOCHEMICAL SIGNATURES, SENECA FALLS, NY. [Internet] [Masters thesis]. Kent State University; 2019. [cited 2021 Mar 08].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=kent1566402595586501.
Council of Science Editors:
Ice Bw. RECONSTRUCTING THE PALEOCLIMATE OF THE MIDDLE DEVONIAN USING
MARCELLUS SHALE GEOCHEMICAL SIGNATURES, SENECA FALLS, NY. [Masters Thesis]. Kent State University; 2019. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=kent1566402595586501

University of South Carolina
16.
Millar, Ian William.
Baldcypress growth in South Carolina and Georgia| Lapses in its correlation with spring precipitation.
Degree: 2010, University of South Carolina
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1473065
► There are apparent multiyear periods of breakdown in the relationship between growth indices and local spring precipitation, stream flow and drought data for the…
(more)
▼ There are apparent multiyear periods of breakdown in the relationship between growth indices and local spring precipitation, stream flow and drought data for the Baldcypress chronologies on the Georgia/South Carolina (GA/SC) coastal plain. The correlations of Baldcypress tree ring growth with local growth season precipitation-related indicators exhibit a sequence of high and low periods between 1870 (when early precipitation records start) and 1985 (the year of the latest tree indices). The length of a high/low cycle is approximately 60 years. The highs and lows are most evident in correlations of tree indices with March through June (MAMJ) season local precipitation, in spite of the Baldcypress stem growth season having been generally accepted as being May through August (MJJA). The change in correlation over time of tree growth indices with MAMJ season precipitation is probably climate driven. The signal is evident in all four of the chronologies located across 200 miles of the GA/SC plain and the signal is a sequence of correlation highs and lows which are contemporaneous across chronologies and coincident with climate signatures. However, the signal is not evident in Baldcypress chronologies farther north in North Carolina and Virginia and farther south in the Florida Panhandle. The hypothesis for the cause of this temporal change in correlation is the temporal change of precipitation spatial homogeneity on the GA/SC coastal plain. There is no actual breakdown of the precipitation/growth relationship during the correlation lows. The apparent breakdowns are the result of mismatches between the precipitation experienced by a chronology and the precipitation measured at local weather stations because of the spatially heterogeneous precipitation associated with a predominance of airmass thunderstorms. The correlation highs are caused by a predominance of spatially homogeneous precipitation associated with frontal systems. Baldcypress tree stem growth in Georgia and South Carolina does not correlate well with the local precipitation of the stem growth season (MJJA). Even though Baldcypress growth is responsive to rainfall (rather than ground moisture or standing water), it correlates best with the local precipitation of the MAMJ season. The hypothesis to explain this apparent conundrum is a combination of drivers. The main driver is that the spatial homogeneity of precipitation tends to be greater in the MAMJ season than in the MJJA season. The secondary drivers are: extreme temperature episodes disrupting the precipitation/stem growth relationship in July/August much more than in the spring; the precipitation/height growth relationship in March/April contributing to determining a year’s subsequent stem growth.
Subjects/Keywords: Climate Change; Meteorology; Paleoclimate Science
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
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APA (6th Edition):
Millar, I. W. (2010). Baldcypress growth in South Carolina and Georgia| Lapses in its correlation with spring precipitation. (Thesis). University of South Carolina. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1473065
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Millar, Ian William. “Baldcypress growth in South Carolina and Georgia| Lapses in its correlation with spring precipitation.” 2010. Thesis, University of South Carolina. Accessed March 08, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=1473065.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Millar, Ian William. “Baldcypress growth in South Carolina and Georgia| Lapses in its correlation with spring precipitation.” 2010. Web. 08 Mar 2021.
Vancouver:
Millar IW. Baldcypress growth in South Carolina and Georgia| Lapses in its correlation with spring precipitation. [Internet] [Thesis]. University of South Carolina; 2010. [cited 2021 Mar 08].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1473065.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Millar IW. Baldcypress growth in South Carolina and Georgia| Lapses in its correlation with spring precipitation. [Thesis]. University of South Carolina; 2010. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1473065
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
17.
Ayers, Meredith.
Stable isotopes of speleothems from the Yucatan Peninsula, Mexico.
Degree: 2010, Northern Illinois University
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1477111
► Two stalagmites, SAN-H and TABI-I were collected from caves in the northern Yucatan Peninsula to analyze for the stable isotopes of carbon and oxygen.…
(more)
▼ Two stalagmites, SAN-H and TABI-I were collected from caves in the northern Yucatan Peninsula to analyze for the stable isotopes of carbon and oxygen. The δ13C value can be used to determine whether C3 or C4/CAM vegetation was dominant and the δ 18O value can theoretically be used to determine whether the climate was wet or arid. Samples were cut, polished, dated using U/Th dating, and sampled using a micromill. SAN-H was dated as Early Classic (1650-1350 B.P.) to the Middle Preclassic 2850-2250 B.P) and the δ13C and δ18O appears to reinforce the interpretations from similar studies. The range of isotope values for δ18O and δ13C were -2.3 to -5.5‰ and -4.0 to -10.3‰, respectively. Although the U/Th dates for TABI-I range from Historical to Late Classic(1350-1050 B.P.), the early Late Classic date is almost certainly invalid, and is the result of presence of clastic material in the sample. TABI-I's range of isotope values for δ18O and δ 13C were –2.1 to -4.9‰ and –4.7 to -9.6‰, respectively. TABI-I's δ18O values appear to be supportive of interpretations found in the literature based on lakecore, stalagmite and sediment studies, and δ13C values could be informative about possible vegetation and land use in the immediate vicinity. Problems with dating reversal and dating accuracy prevented more detailed interpretations of the data.
Subjects/Keywords: Geology; Paleoclimate Science; Geochemistry
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ayers, M. (2010). Stable isotopes of speleothems from the Yucatan Peninsula, Mexico. (Thesis). Northern Illinois University. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1477111
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ayers, Meredith. “Stable isotopes of speleothems from the Yucatan Peninsula, Mexico.” 2010. Thesis, Northern Illinois University. Accessed March 08, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=1477111.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ayers, Meredith. “Stable isotopes of speleothems from the Yucatan Peninsula, Mexico.” 2010. Web. 08 Mar 2021.
Vancouver:
Ayers M. Stable isotopes of speleothems from the Yucatan Peninsula, Mexico. [Internet] [Thesis]. Northern Illinois University; 2010. [cited 2021 Mar 08].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1477111.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ayers M. Stable isotopes of speleothems from the Yucatan Peninsula, Mexico. [Thesis]. Northern Illinois University; 2010. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1477111
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
18.
Fenner, Lindsay A.
Changing Landscapes During the Terminal Pleistocene/Early Holocene| The Archaeology and Paleoclimate of the Mud Lake Basin, Nye County, Nevada.
Degree: 2011, University of Nevada, Reno
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1494143
► Archaeological investigation along Pleistocene lakeshores is a longstanding and common approach to prehistoric research in the Great Basin. Continuing in this tradition, this thesis…
(more)
▼ Archaeological investigation along Pleistocene lakeshores is a longstanding and common approach to prehistoric research in the Great Basin. Continuing in this tradition, this thesis considers the archaeological remains present from pluvial Mud Lake, Nye County, Nevada coupled with an examination of paleoclimatic conditions to assess land-use patters during the terminal Pleistocene/early Holocene. Temporally diagnostic lithic assemblages from 44 localities in the Mud Lake basin provide the framework for which environmental proxy records are considered. Overwhelmingly occupied by Prearchaic groups, comprising 76.6% of all diagnostic artifacts present, Mud Lake was intensively utilized right up to its desiccation after the Younger Dryas, estimated at 9,000 radiocarbon years before present. Intermittently occupied through the remainder of the Holocene, different land-use strategies were employed as a result of shifting subsistence resources reacting to an ever changing environment. The results of this thesis complement the existing knowledge base on Prearchaic groups in the Great Basin, with particular contributions to the lesser studied small pluvial basins.
Subjects/Keywords: Anthropology, Archaeology; Paleoclimate Science
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Fenner, L. A. (2011). Changing Landscapes During the Terminal Pleistocene/Early Holocene| The Archaeology and Paleoclimate of the Mud Lake Basin, Nye County, Nevada. (Thesis). University of Nevada, Reno. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1494143
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Fenner, Lindsay A. “Changing Landscapes During the Terminal Pleistocene/Early Holocene| The Archaeology and Paleoclimate of the Mud Lake Basin, Nye County, Nevada.” 2011. Thesis, University of Nevada, Reno. Accessed March 08, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=1494143.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Fenner, Lindsay A. “Changing Landscapes During the Terminal Pleistocene/Early Holocene| The Archaeology and Paleoclimate of the Mud Lake Basin, Nye County, Nevada.” 2011. Web. 08 Mar 2021.
Vancouver:
Fenner LA. Changing Landscapes During the Terminal Pleistocene/Early Holocene| The Archaeology and Paleoclimate of the Mud Lake Basin, Nye County, Nevada. [Internet] [Thesis]. University of Nevada, Reno; 2011. [cited 2021 Mar 08].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1494143.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Fenner LA. Changing Landscapes During the Terminal Pleistocene/Early Holocene| The Archaeology and Paleoclimate of the Mud Lake Basin, Nye County, Nevada. [Thesis]. University of Nevada, Reno; 2011. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1494143
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Oklahoma State University
19.
Joines, Jason Paul.
17,000 years of climate change| The phytolith record from Hall's Cave, Texas.
Degree: 2012, Oklahoma State University
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1506715
► <i>Scope and Method of Study.</i> We used modern analog technique to develop phytolith-based transfer functions. We applied these transfer functions to phytolith assemblages in…
(more)
▼ <i>Scope and Method of Study.</i> We used modern analog technique to develop phytolith-based transfer functions. We applied these transfer functions to phytolith assemblages in sediments from Hall's Cave, Texas to reconstruct mean annual precipitation and temperature for the central Edwards Plateau from 17,550 BP to 730 BP and tested these reconstructions for statistical significance. We also interpreted the phytolith assemblage and applied phytolith indices of woody cover and of C3 versus C4 grasses to reconstruct Edwards Plateau vegetation over the same period. <i>Findings and Conclusions.</i> Reconstructed mean annual precipitation (RMAP) was less than 450 mm during the last glacial period with the exception of a spike to over 1150 mm at 17,160 BP. As glacial conditions ended RMAP progressively increased with oscillations between modern (800 mm) and higher values until reaching a high of over 1200 mm at 9860 BP. Then RMAP gradually decreased to less than 825 mm at 6890 BP followed by a gradual increase to over 1325 mm at 2560 BP. RMAP then dropped sharply to less than 625 mm at 1640 BP followed by an increase to above modern values by 730 BP. Reconstructed mean annual temperature (RMAT) followed a similar trend. RMAT was much cooler than present with a minimum of less than 10°C during the last glacial period. RMAT also spiked at 17,160 BP approaching 15°C before declining again. After glacial conditions ended RMAT generally increased reaching 17°C by 3620 BP. After 2560 BP RMAT declined sharply to near 12.5°C at 1640 BP before increasing again reaching 14°C by 730 BP. RMAP proved to be statistically significant. We also have confidence in the trend exhibited by RMAT but temperatures may be underestimated. Vegetation on the Edwards Plateau near the end of the last glacial period was open woodland or savanna with mixed C3 and C4 grasses changing to closed woodland by 16,740 BP and transitioning to forest by 14,940 BP with grasses nearly absent. Forest with little or no grass was the most common vegetation for the next 12,000 years. Open woodland or savanna with mixed C3 and C4 grasses reappeared at 2560 BP transitioning to a mixed C3 and C3 grassland by 2230 BP and to C 4 grassland by 730 BP.
Subjects/Keywords: Climate Change; Paleoecology; Paleoclimate Science
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Joines, J. P. (2012). 17,000 years of climate change| The phytolith record from Hall's Cave, Texas. (Thesis). Oklahoma State University. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1506715
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Joines, Jason Paul. “17,000 years of climate change| The phytolith record from Hall's Cave, Texas.” 2012. Thesis, Oklahoma State University. Accessed March 08, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=1506715.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Joines, Jason Paul. “17,000 years of climate change| The phytolith record from Hall's Cave, Texas.” 2012. Web. 08 Mar 2021.
Vancouver:
Joines JP. 17,000 years of climate change| The phytolith record from Hall's Cave, Texas. [Internet] [Thesis]. Oklahoma State University; 2012. [cited 2021 Mar 08].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1506715.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Joines JP. 17,000 years of climate change| The phytolith record from Hall's Cave, Texas. [Thesis]. Oklahoma State University; 2012. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1506715
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
20.
Afshar, Sara.
High-resolution windows into abrupt and millennial-scale changes in climate and ocean since the mid-Pleistocene transition, Santa Barbara basin, California.
Degree: 2012, California State University, Long Beach
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1507626
► Two high-resolution, multi-proxy records were produced for ∼ 5-kyr windows at ∼ 290 ka and ∼ 735 ka, from piston cores acquired in Santa…
(more)
▼ Two high-resolution, multi-proxy records were produced for ∼ 5-kyr windows at ∼ 290 ka and ∼ 735 ka, from piston cores acquired in Santa Barbara basin, California. These records show that abrupt, millennial- to sub-millennial-scale oscillations in weight % total organic carbon carbonate and, at lower resolution, biogenic silica, have occurred concurrent with climatic changes indicated by δ18O of planktonic foraminifera <i> Globigerina bulloides.</i> These oscillations are similar in magnitude and periodicity to the Dansgaard-Oeschger events observed at Ocean Drilling Program (ODP) Site 893 during Marine Isotopic Stage 3. In both records, the relationships in the proxies suggest higher sea-surface temperatures and productivity, associated with decreased benthic oxygenation during interstadials that, at least at ∼ 290 ka, resulted in anoxic conditions. Combined with ODP Site 893 data, these records provide three almost equally spaced datums for studying high-frequency climate behavior and the sensitivity of oceanic biogeochemical responses since the Mid-Pleistocene Transition.
Subjects/Keywords: Geology; Marine Geology; Paleoclimate Science
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Afshar, S. (2012). High-resolution windows into abrupt and millennial-scale changes in climate and ocean since the mid-Pleistocene transition, Santa Barbara basin, California. (Thesis). California State University, Long Beach. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1507626
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Afshar, Sara. “High-resolution windows into abrupt and millennial-scale changes in climate and ocean since the mid-Pleistocene transition, Santa Barbara basin, California.” 2012. Thesis, California State University, Long Beach. Accessed March 08, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=1507626.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Afshar, Sara. “High-resolution windows into abrupt and millennial-scale changes in climate and ocean since the mid-Pleistocene transition, Santa Barbara basin, California.” 2012. Web. 08 Mar 2021.
Vancouver:
Afshar S. High-resolution windows into abrupt and millennial-scale changes in climate and ocean since the mid-Pleistocene transition, Santa Barbara basin, California. [Internet] [Thesis]. California State University, Long Beach; 2012. [cited 2021 Mar 08].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1507626.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Afshar S. High-resolution windows into abrupt and millennial-scale changes in climate and ocean since the mid-Pleistocene transition, Santa Barbara basin, California. [Thesis]. California State University, Long Beach; 2012. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1507626
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
21.
Weide, Denise Marie.
Freshwater diatoms as a proxy for Late Holocene monsoon intensity in Lac Ba Be in the Karst Region of Northern Viet Nam.
Degree: 2013, California State University, Long Beach
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1522269
► Diatom assemblages from a sediment core from Lac Ba Bê in the northern mountains of Viêt Nam were analyzed at sub-decadal to sub-annual resolution…
(more)
▼ Diatom assemblages from a sediment core from Lac Ba Bê in the northern mountains of Viêt Nam were analyzed at sub-decadal to sub-annual resolution to assess environmental change over the last 500 years. The most striking feature of the core is the change in diatom assemblages in the top 4 cm of the core (late 1970s/early 1980s). This section is distinguished by a flora that is characterized by a high planktic to benthic ratio and the dominant species require relatively low nutrients when compared to diatoms in the rest of the core. In particular, it marks the introduction of two <i> Cyclotella</i> species that become the dominant planktic species and a related decline in <i>Aulacoseira</i> species. The change in flora is interpreted as a possible response to a weakened Southeast Asian Monsoon beginning in the 1970s. In addition to the environmental change, a new species of <i>Aulacoseira</i> is described from Ba Bê.
Subjects/Keywords: Paleontology; Paleoecology; Paleoclimate Science
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Weide, D. M. (2013). Freshwater diatoms as a proxy for Late Holocene monsoon intensity in Lac Ba Be in the Karst Region of Northern Viet Nam. (Thesis). California State University, Long Beach. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1522269
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Weide, Denise Marie. “Freshwater diatoms as a proxy for Late Holocene monsoon intensity in Lac Ba Be in the Karst Region of Northern Viet Nam.” 2013. Thesis, California State University, Long Beach. Accessed March 08, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=1522269.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Weide, Denise Marie. “Freshwater diatoms as a proxy for Late Holocene monsoon intensity in Lac Ba Be in the Karst Region of Northern Viet Nam.” 2013. Web. 08 Mar 2021.
Vancouver:
Weide DM. Freshwater diatoms as a proxy for Late Holocene monsoon intensity in Lac Ba Be in the Karst Region of Northern Viet Nam. [Internet] [Thesis]. California State University, Long Beach; 2013. [cited 2021 Mar 08].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1522269.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Weide DM. Freshwater diatoms as a proxy for Late Holocene monsoon intensity in Lac Ba Be in the Karst Region of Northern Viet Nam. [Thesis]. California State University, Long Beach; 2013. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1522269
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
22.
Barclay, Richard Shern.
Testing The Driving Mechanisms For Ocean Anoxic Event 2 (94Ma) Using pCO2 Estimates And Carbon Isotopes Derived From Fossil Plant Material In The Dakota Formation Of Southwestern Utah.
Degree: 2011, Northwestern University
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3456521
► The main goal of this dissertation was to construct a record of atmospheric CO2 concentration (<i>p</i>CO2) using the stomatal proxy method on fossil plant…
(more)
▼ The main goal of this dissertation was to construct a record of atmospheric CO2 concentration (<i>p</i>CO2) using the stomatal proxy method on fossil plant cuticle in the Dakota Formation of Utah. A complimentary δ13Corg record was developed from the same samples to constrain the mechanisms that produced marine anoxia during Ocean Anoxic Event 2 (OAE2). This ~600ka event in the late Cenomanian (94 Ma) represented one of most significant shifts among interdependent biogeochemical cycles known from the geologic record, including a +4 / excursion in δ 13Corg used to define the event globally. Using the established marine to terrestrial correlation, it was possible to assess the response of marine and terrestrial systems over a one million year period that bracketed the onset of OAE2. Stomatal index values from two cuticle morphospecies were used to create a continuous sequence, converted to <i>p</i>CO2 values using two modern analogue species of Lauraceae that matched the fossil material. This analysis demonstrated that decreases in <i>p</i>CO2 closely tracked the global δ13Corg record from fossil plant material. The data in this dissertation supports the hypothesis that elevated primary productivity led to enhanced burial of marine organic carbon and resulted in two significant decreases in <i>p</i>CO 2 at the onset of OAE2. This suggested that the atmospheric, terrestrial, and marine carbon reservoirs were tightly coupled during the Cenomanian. The <i>p</i>CO2 decreases within OAE2 were overlain on a longer term <i>p</i>CO2 rise that began as much as 500 ka before the event. Background <i>p</i>CO2 levels of ∼370 +100/-70 ppm increased to a peak of ∼500 +400/-180 ppm in the early stages of OAE2. The steady increase in <i>p</i>CO2 began 22 m below the onset of OAE2 and was coincident with a large negative δ13C org excursion. This was followed by a consistent -1.56 / shift in δ 13CorgC that tracked the gradual 90 ppm increase <i> p</i>CO2 leading into OAE2. A mass balance approach that used the δ13Corg and <i>p</i>CO 2 shifts as constraints on the isotopic value of the atmosphere provided support for the volcanic initiation hypothesis prior to OAE2, but suggested that the CO2 originated as thermogenic methane or oxidized terrestrial organic carbon.
Subjects/Keywords: Paleontology; Biogeochemistry; Paleoclimate Science
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Barclay, R. S. (2011). Testing The Driving Mechanisms For Ocean Anoxic Event 2 (94Ma) Using pCO2 Estimates And Carbon Isotopes Derived From Fossil Plant Material In The Dakota Formation Of Southwestern Utah. (Thesis). Northwestern University. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3456521
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Barclay, Richard Shern. “Testing The Driving Mechanisms For Ocean Anoxic Event 2 (94Ma) Using pCO2 Estimates And Carbon Isotopes Derived From Fossil Plant Material In The Dakota Formation Of Southwestern Utah.” 2011. Thesis, Northwestern University. Accessed March 08, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=3456521.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Barclay, Richard Shern. “Testing The Driving Mechanisms For Ocean Anoxic Event 2 (94Ma) Using pCO2 Estimates And Carbon Isotopes Derived From Fossil Plant Material In The Dakota Formation Of Southwestern Utah.” 2011. Web. 08 Mar 2021.
Vancouver:
Barclay RS. Testing The Driving Mechanisms For Ocean Anoxic Event 2 (94Ma) Using pCO2 Estimates And Carbon Isotopes Derived From Fossil Plant Material In The Dakota Formation Of Southwestern Utah. [Internet] [Thesis]. Northwestern University; 2011. [cited 2021 Mar 08].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3456521.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Barclay RS. Testing The Driving Mechanisms For Ocean Anoxic Event 2 (94Ma) Using pCO2 Estimates And Carbon Isotopes Derived From Fossil Plant Material In The Dakota Formation Of Southwestern Utah. [Thesis]. Northwestern University; 2011. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3456521
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Delaware
23.
Venti, Nicholas L.
The role of the Kuroshio Extension in the Pliocene-Pleistocene climate transition.
Degree: 2012, University of Delaware
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3498548
► Despite the North Pacific's potential role as a connection between high and low latitudes during the Pliocene-Pleistocene climate transition, the region remains largely unexplored.…
(more)
▼ Despite the North Pacific's potential role as a connection between high and low latitudes during the Pliocene-Pleistocene climate transition, the region remains largely unexplored. Here, from Ocean Drilling Program Site 1208 in the Kuroshio Current Extension (KCE), I present the region's first long, orbital-scale (2500-year time step) surface (3.00–1.76 Ma) and deep (3.70–1.76 Ma) marine records to span this cooling episode. A benthic foraminifer (<i>Planulina wuellerstorfi</i>) δ18O record provides orbital-scale age control and confirms continuous stratigraphy at the single-hole site. The δ18O time series records ice-volume changes, following a 41-kyr cycle that intensifies in amplitude with stepwise advances of northern hemisphere glaciers (NHG) toward mid-latitudes at 3.3 and 2.7 Ma. Accordingly, alkenone-based sea surface temperature (SST) estimates reveal cooling at 2.7 Ma with the onset of widespread NHG, and at 2.2 Ma with the appearance of cool waters in the eastern equatorial Pacific (EEP). On the orbital scale, SSTs follow a 41-kyr cycle that doubles in amplitude at 2.7 Ma, low temperatures corresponding to glacial intervals. In contrast, summer surface hydrography (mostly temperature) as reconstructed through Globigerinoides (Gs.) ruber δ18O measurements suggest warming of the KCE at 2.7 Ma, coincident with the intensification of NHG, supporting the idea that a warm North Pacific provided moisture for expanding glaciers. At the orbital scale, the summer hydrographic reconstruction varies predominantly on precesional (∼1/20-kyr frequency) rhythms, reflecting the influence of subtropical insolation. The contrast between KCE cooling (alkenones) with the advance of NHG to mid-latitudes and the insensitivity of summer hydrography (Gs. ruber δ18O) to ice volume changes implies winter heat loss to the atmosphere, and thus the emergence of the region as a major locus of ocean-atmosphere heat transfer at 2.7 Ma. Shifts in the timing of the 41-kyr KCE cooling cycle suggests the competing influence of glacial climate and insolation over the subtropical sea surface. After evolving in rhythm from 3.0 to 2.1 Ma, a timing offset between KCE and EEP SST cycles develops to reveal a decoupling of the two ends of the subtropical gyre after the upwelling of cool waters in the equatorial Pacific that ended permanent El Niño.
Subjects/Keywords: Climate Change; Paleoclimate Science; Geochemistry
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Venti, N. L. (2012). The role of the Kuroshio Extension in the Pliocene-Pleistocene climate transition. (Thesis). University of Delaware. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3498548
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Venti, Nicholas L. “The role of the Kuroshio Extension in the Pliocene-Pleistocene climate transition.” 2012. Thesis, University of Delaware. Accessed March 08, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=3498548.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Venti, Nicholas L. “The role of the Kuroshio Extension in the Pliocene-Pleistocene climate transition.” 2012. Web. 08 Mar 2021.
Vancouver:
Venti NL. The role of the Kuroshio Extension in the Pliocene-Pleistocene climate transition. [Internet] [Thesis]. University of Delaware; 2012. [cited 2021 Mar 08].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3498548.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Venti NL. The role of the Kuroshio Extension in the Pliocene-Pleistocene climate transition. [Thesis]. University of Delaware; 2012. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3498548
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of California, Berkeley
24.
Jones, Claudia Meredith.
Reconstruction of microbial and environmental conditions in an Australian hypersaline ecosystem from the mid-Pleistocene through the present.
Degree: 2012, University of California, Berkeley
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3498990
► This research provides empiric constraints on regional climate shifts in southeastern Australia through multiple glacial-interglacial cycles over the past ∼400 ka. Because lake sediment…
(more)
▼ This research provides empiric constraints on regional climate shifts in southeastern Australia through multiple glacial-interglacial cycles over the past ∼400 ka. Because lake sediment records have the potential to provide a contiguous history of temperature and aridity in a terrestrial environment, we collected cores from the lakebed and through the lunette of Lake Tyrrell in northern Victoria, Australia. Lake Tyrrell is hypersaline and ephemeral; consequently, deflation of sediments has created gaps in the sediment sequence, and many sedimentary elements traditionally used for palaeoenvironmental reconstruction are poorly-preserved or absent. Since all of the lakes in the region share these limitations, it was necessary to develop methods to extract useful information from the available sampling sites. As a new approach, we combined the analyses of the identities, quantities and isotopic signatures of preserved lipid biomarkers with traditional proxies such as pollen, charcoal, mineral content and sedimentary textures. Together, these data describe changes in the chemistry of the lake, in the community composition of microbes within the lake, and in the higher plant ecosystem around the lake and within the catchment. Evidence of at least three glacial-interglacial cycles is preserved in Tyrrell lakebed and lunette sediments, though the temporal sequence is uncertain due to the lack of dateable materials within the Tyrrell sediments. During what we interpret as the two most recent glacial maxima (∼20 ka and 140 ka), the lake dried completely and higher plants colonized the surface following leaching of salt from the surface sediment. At one of the two preceding glacial maxima (either 260 ka or 340 ka), the lake dried to <1m depth, became groundwater-fed, and supported the growth of microbial mats. These mats colonized the interface between the halite crust and the sediment surface. Halophilic archaea and algae lived within the water column. Both the chemistry and microbiology of the lake were comparable to the modern system. During interglacial periods, increased precipitation and runoff increased lake depth to several meters. Lower salinity promoted the growth of dinoflagellates and eustigmatophyte algae in the water column, and of anaerobic bacteria within sediments. In contrast to the shifts in lake water levels and chemistry, the plant community within the catchment stayed relatively constant through the end of the Pleistocene. It was composed of a dryland casuarina wood with a grassy understory. During the Holocene, increased precipitation following the last glacial maxima (LGM) caused the casuarina woodland to be replaced by <i> Callitris</i> thickets and grasses. Two shifts in the isotopic signature of plant waxes indicate changes in the relative abundance of C3 vs C4 grasses over this period. Increased dominance of C4 grasses following the last glacial maximum points to a strengthening in the Australian summer monsoon.…
Subjects/Keywords: Biogeochemistry; Chemistry, Organic; Paleoclimate Science
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Jones, C. M. (2012). Reconstruction of microbial and environmental conditions in an Australian hypersaline ecosystem from the mid-Pleistocene through the present. (Thesis). University of California, Berkeley. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3498990
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Jones, Claudia Meredith. “Reconstruction of microbial and environmental conditions in an Australian hypersaline ecosystem from the mid-Pleistocene through the present.” 2012. Thesis, University of California, Berkeley. Accessed March 08, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=3498990.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Jones, Claudia Meredith. “Reconstruction of microbial and environmental conditions in an Australian hypersaline ecosystem from the mid-Pleistocene through the present.” 2012. Web. 08 Mar 2021.
Vancouver:
Jones CM. Reconstruction of microbial and environmental conditions in an Australian hypersaline ecosystem from the mid-Pleistocene through the present. [Internet] [Thesis]. University of California, Berkeley; 2012. [cited 2021 Mar 08].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3498990.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Jones CM. Reconstruction of microbial and environmental conditions in an Australian hypersaline ecosystem from the mid-Pleistocene through the present. [Thesis]. University of California, Berkeley; 2012. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3498990
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
25.
Fantozzi, Joanna Marie.
Reconstruction of hydrologic variability at Lake Elsinore, California, during the late-Glacial to Holocene transition.
Degree: 2011, California State University, Fullerton
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1499352
► A multi-proxy sedimentological study was completed on a section of a sediment core from Lake Elsinore, California, that spans the late-Glacial to Holocene transition…
(more)
▼ A multi-proxy sedimentological study was completed on a section of a sediment core from Lake Elsinore, California, that spans the late-Glacial to Holocene transition (17,619–9,587 calendar years before present [cy BP]). The results of the study provide the first high resolution terrestrial climate record from Southern California that spans this interesting interval In Earth's climate history. The results indicate that the depositional and climatic environments of Lake Elsinore changed significantly across this transition. Interpretation of the results suggests that the lake was relatively deep during the last glacial period, but then became relatively shallow near the beginning of the Holocene interglacial. Interpretation of the results also suggests that the Lake Elsinore deglaciation sequence was characterized by a two step drying trend, which is explained here by changes in North American ice sheet extent and variations in the intensity of the Atlantic Meridional Overturning Circulation. Together, the latter two forcings acted to modulate the average position of the circumpolar jet stream, the mean latitude of the Intertropical Convergence Zone, and their combined impacts on the Northern Hemisphere winter storm tracks, which determine the annual hydrologic budget of Southern California. A comparison of the Lake Elsinore record with other regional paleoclimate records shows strong evidence for synchronous hydrologic change between study sites throughout southwestern North America. Additionally, a comparison of the Lake Elsinore record with the Greenland ice core record provides evidence for a coupling between changes in climate over the North Atlantic and Southern California during the late-Glacial to Holocene transition.
Subjects/Keywords: Sedimentary Geology; Paleoclimate Science
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Fantozzi, J. M. (2011). Reconstruction of hydrologic variability at Lake Elsinore, California, during the late-Glacial to Holocene transition. (Thesis). California State University, Fullerton. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1499352
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Fantozzi, Joanna Marie. “Reconstruction of hydrologic variability at Lake Elsinore, California, during the late-Glacial to Holocene transition.” 2011. Thesis, California State University, Fullerton. Accessed March 08, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=1499352.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Fantozzi, Joanna Marie. “Reconstruction of hydrologic variability at Lake Elsinore, California, during the late-Glacial to Holocene transition.” 2011. Web. 08 Mar 2021.
Vancouver:
Fantozzi JM. Reconstruction of hydrologic variability at Lake Elsinore, California, during the late-Glacial to Holocene transition. [Internet] [Thesis]. California State University, Fullerton; 2011. [cited 2021 Mar 08].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1499352.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Fantozzi JM. Reconstruction of hydrologic variability at Lake Elsinore, California, during the late-Glacial to Holocene transition. [Thesis]. California State University, Fullerton; 2011. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1499352
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
26.
Tierney, Jessica E.
An organic geochemical perspective on tropical East African paleoclimate.
Degree: 2010, Brown University
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3430215
► Recent development of biomarker-based paleoclimate proxies provides new analytical capabilities through which paleoenvironmental change can be inferred. Here, I explore the utility of these…
(more)
▼ Recent development of biomarker-based paleoclimate proxies provides new analytical capabilities through which paleoenvironmental change can be inferred. Here, I explore the utility of these organic proxies towards solving problems of tropical paleoclimatology within East Africa. Specifically, I apply compound-specific deuterium/hydrogen (D/H) ratios, compound-specific carbon isotopic ratios, and tetraether-based paleoproxies to lake sediments from East Africa (Lake Tanganyika and Lake Challa) to test the ability of these novel proxies to infer past changes in the hydrological cycle, terrestrial vegetation, and surface temperature. I demonstrate that compound-specific D/H ratios, as measured on terrestrial higher plant leaf waxes, are a robust, albeit complex proxy for past changes in East African hydrology over a variety of timescales (multidecadal-orbital). The use of glycerol dialkyl glycerol tetraethers (GDGTs) as paleothermometers in lacustrine environments is also explored in depth. I show that the Tetraether Index of 86 Carbons (TEX86) proxy is a reliable proxy for lake surface temperature in Lake Tanganyika over both short (last two millennia) and long (60,000 years) timescales. However, TEX86 is not universally applicable in lacustrine systems. With this in mind, I demonstrate in a surface transect study that branched GDGTs, ubiquitous compounds in terrestrial soils, are also abundant in East African lake sediments, and show considerable promise as an alternative lacustrine paleothermometer. In summary, I demonstrate that organic geochemical techniques provide powerful new insights on East African paleoclimate, including orbital controls on climate, and the influence of remote, high-latitude teleconnections. Furthermore, D/H ratios inferred from leaf waxes and tetraether-inferred changes in temperature provide quantitative paleodata suitable for proxy-model comparison.
Subjects/Keywords: Geology; Paleoclimate Science; Geochemistry
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Tierney, J. E. (2010). An organic geochemical perspective on tropical East African paleoclimate. (Thesis). Brown University. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3430215
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tierney, Jessica E. “An organic geochemical perspective on tropical East African paleoclimate.” 2010. Thesis, Brown University. Accessed March 08, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=3430215.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tierney, Jessica E. “An organic geochemical perspective on tropical East African paleoclimate.” 2010. Web. 08 Mar 2021.
Vancouver:
Tierney JE. An organic geochemical perspective on tropical East African paleoclimate. [Internet] [Thesis]. Brown University; 2010. [cited 2021 Mar 08].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3430215.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tierney JE. An organic geochemical perspective on tropical East African paleoclimate. [Thesis]. Brown University; 2010. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3430215
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Southern California
27.
Berkelhammer, Max B.
Perspectives on drought and temperature variability for the southwestern United States from a new hydro-isotopic network.
Degree: 2011, University of Southern California
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3434545
► To directly test the relationship between atmospheric circulation and the isotopic composition of precipitation in the southwestern US, I develop a catalog of 120…
(more)
▼ To directly test the relationship between atmospheric circulation and the isotopic composition of precipitation in the southwestern US, I develop a catalog of 120 individual storm events striking the west coast over a 5-year period. The cause of isotopic variability is assessed using an isotope-enabled GCM simulation that has been nudged to Reanalysis fields. The results from this analysis show that changes in meridional moisture flux from the low latitudes leave a tangible mark on precipitation in the region. This relationship can theoretically be quantified by a linear relationship between the modeled isotopic composition of precipitation and the relative percentage of low latitude tagged water that is delivered with the storm system. The controls on the isotopic variability of precipitation change substantially moving eastward into the North American Monsoon region where moisture is not delivered by large frontal storms but rather through localized convection. In these regions, variability of the moisture source is subdued and isotopic variability arises principally as a function of depth of convection, which leads to a close correlation between temperature and δ18O. Mechanistic constraints are placed on the cause of isotopic variability in the cellulose chronologies using a forward modeling approach where meteorological data and the isotopic composition of soil water and vapor from an ensemble of isotope-enabled GCM simulations are fed into a geochemical model that captures the isotopic fractionation associated with the biogeochemical processes in the tree prior to cellulose metabolism. At sites where precipitation is predominantly from winter precipitation the intra-ring isotopic cycles are driven largely by the relative humidity and temperature at the leaf boundary while the higher amplitude interannual variability arises from changes in the trees source water. Variations in the shape of the cycle reflect not only differences in growing season climate but also changes in the length of the growing season. At sites where moisture is predominantly from summer rains, the cycle directly tracks the isotopic composition of precipitation during the growing season. The isotope chronology from the Almagre Mountains in Colorado shares little covariance with the more western sites, because it relies predominately on monsoonal moisture whose isotopic composition tracks temperature. The record from this sites provides a 500-year reconstruction of growing season temperatures for this region. Growing season temperatures in the southern Rocky Mountains display a high degree of multi-decadal variability between the 18<i> th</i>-20<i>th</i> century but only subdued variability prior (15<i>th</i>-18<i> th</i> centuries). The temperature reconstruction presented here differs markedly from the tree-ring width based temperature reconstruction from the same site but agrees with regional temperature reconstructions based on instrumental temperature…
Subjects/Keywords: Climate Change; Paleoclimate Science
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Berkelhammer, M. B. (2011). Perspectives on drought and temperature variability for the southwestern United States from a new hydro-isotopic network. (Thesis). University of Southern California. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3434545
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Berkelhammer, Max B. “Perspectives on drought and temperature variability for the southwestern United States from a new hydro-isotopic network.” 2011. Thesis, University of Southern California. Accessed March 08, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=3434545.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Berkelhammer, Max B. “Perspectives on drought and temperature variability for the southwestern United States from a new hydro-isotopic network.” 2011. Web. 08 Mar 2021.
Vancouver:
Berkelhammer MB. Perspectives on drought and temperature variability for the southwestern United States from a new hydro-isotopic network. [Internet] [Thesis]. University of Southern California; 2011. [cited 2021 Mar 08].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3434545.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Berkelhammer MB. Perspectives on drought and temperature variability for the southwestern United States from a new hydro-isotopic network. [Thesis]. University of Southern California; 2011. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3434545
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Portland State University
28.
Harden, Tessa Maureen.
Late-Holocene Flood History, Flood-Frequency, and Paleoclimate Analysis of the Central Black Hills, South Dakota.
Degree: 2012, Portland State University
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3518434
► Stratigraphic records in four basins in the central Black Hills in combination with hydraulic calculations show that all basins have experienced multiple large floods…
(more)
▼ Stratigraphic records in four basins in the central Black Hills in combination with hydraulic calculations show that all basins have experienced multiple large floods in the last 2,000 years with flow rates substantially larger than those gaged historically. Flood-frequency analyses for the study reaches account for 29 paleofloods inferred from interpretation of stratigraphic records locally extending back 1,000 to almost 2,000 years. The addition of paleoflood data to the gaged and historical data significantly reduced uncertainties related to flood-frequency. For all study reaches the 95-percent confidence intervals about the low-probability quantile estimates (100-, 200-, and 500-year recurrence-intervals) were reduced by at least 78 percent relative to those for the gaged records only. In some cases, 95-percent uncertainty intervals were reduced by 99 percent or more. Additionally, a stratigraphic record of 35 large paleofloods and four large historical floods during the last 2,000 years (including several floods not used in the frequency analyses due to age constraints) reveal four flooding episodes at A.D.: 130-40, 640-670, 900-1290, and 1410 to present. During the Medieval Climate Anomaly (∼A.D. 900-1300) the Black Hills experienced 13 large floods compared to nine large floods in the previous 800 years. This high concentration of large flooding events were likely caused by: 1) instability of air masses caused by stronger than normal westerlies; 2) larger or more frequent hurricanes in the Gulf of Mexico and Atlantic Ocean; and/or 3) reduced land covering vegetation and an increase in forest fires caused by the severe drought. By examining the response of streamflow to the MCA, it seems likely that if severe long-term drought conditions persist for the Black Hills region, an increase in the frequency and magnitude of large floods can be expected. The Black Hills paleofloods represent some of the largest known floods, relative to drainage area, for the United States. Many of the other largest known United States floods are in areas with physiographic and climatologic conditions broadly similar to the Black Hills—semi-arid and rugged landscapes that intercept and focus heavy precipitation from convective storm systems.
Subjects/Keywords: Geology; Hydrology; Geomorphology; Paleoclimate Science
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Harden, T. M. (2012). Late-Holocene Flood History, Flood-Frequency, and Paleoclimate Analysis of the Central Black Hills, South Dakota. (Thesis). Portland State University. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3518434
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Harden, Tessa Maureen. “Late-Holocene Flood History, Flood-Frequency, and Paleoclimate Analysis of the Central Black Hills, South Dakota.” 2012. Thesis, Portland State University. Accessed March 08, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=3518434.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Harden, Tessa Maureen. “Late-Holocene Flood History, Flood-Frequency, and Paleoclimate Analysis of the Central Black Hills, South Dakota.” 2012. Web. 08 Mar 2021.
Vancouver:
Harden TM. Late-Holocene Flood History, Flood-Frequency, and Paleoclimate Analysis of the Central Black Hills, South Dakota. [Internet] [Thesis]. Portland State University; 2012. [cited 2021 Mar 08].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3518434.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Harden TM. Late-Holocene Flood History, Flood-Frequency, and Paleoclimate Analysis of the Central Black Hills, South Dakota. [Thesis]. Portland State University; 2012. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3518434
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

The University of Arizona
29.
Truebe, Sarah Anne.
Past climate, modern caves, and future resource management in speleothem paleoclimatology.
Degree: 2016, The University of Arizona
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10158145
► My research focuses on reconstructing past climate in southern Arizona using cave deposits called speleothems. However, this necessitates a broader perspective than simply a…
(more)
▼ My research focuses on reconstructing past climate in southern Arizona using cave deposits called speleothems. However, this necessitates a broader perspective than simply a geochemical time series, and therefore, I also investigate modern cave systems using a combination of modeling and observational datasets. Finally, cave deposits are fundamentally non-renewable resources, and sampling for past climate reconstruction can be destructive, unlike other cave uses. My last investigation is focused on developing possible best practice recommendations for paleoclimate scientists and other cave stakeholders moving forward. We developed two new stalagmite records of past climate variability in southern Arizona over the past 7000 years. Past climate reconstruction from two caves (Cave of the Bells and Fort Huachuca Cave) highlights insolation control of southern Arizona hydroclimate from 7000-2000 years before present. Additionally, comparison between two stalagmites with different seasonal sensitivities uncovers a few eras of multi-decade long droughts in southern Arizona, which align with other regional reconstructions of past climates and elucidate forcings on Southwest paleoclimate as emergent from both external (insolation) and internal climate variability in the Pacific and Atlantic Ocean basins. Although the oxygen isotopic signal of cave calcite in speleothems is complex, agreement with these other records indicates that the speleothem records from these caves primarily record a climate signal. Modeling and monitoring of modern caves both helps us interpret paleoclimate records and enhances our understanding of cave systems in their own right. Modeling of Cave of the Bells dripwaters demonstrates the effect of storage and mixing on the dripwater oxygen isotope signal; non-climate processes can imprint on dripwater variability on multidecadal timescales. Monitoring shows that on very small spatial scales, every cave is different, and even sites within the same cave respond uniquely to surface climate. Most notably, calcite oxygen isotopic composition, used to reconstruct past climate, shows seasonal variability unrelated to dripwater and surface rainfall oxygen isotope variability. Substantial oxygen isotope disequilibrium is identified at numerous caves sites in southern Arizona, and this understanding aligns with a growing number of cave studies that demonstrate the long-held assumption of isotopic equilibrium in cave systems may not always be valid or that the way in which we define isotopic equilibrium insufficiently captures the variety of processes controlling the oxygen isotopic composition of speleothems. Overall, however, monitoring can identify stalagmites that are more sensitive to surface climate and less sensitive to these in-cave processes by identifying sites with dripwater variability responses to surface rainfall variability and sites that precipitate close to oxygen isotopic equilibrium. Finally, a major missing component in speleothem research is the fact that…
Subjects/Keywords: Climate change; Paleoclimate science; Geochemistry
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Truebe, S. A. (2016). Past climate, modern caves, and future resource management in speleothem paleoclimatology. (Thesis). The University of Arizona. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10158145
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Truebe, Sarah Anne. “Past climate, modern caves, and future resource management in speleothem paleoclimatology.” 2016. Thesis, The University of Arizona. Accessed March 08, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=10158145.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Truebe, Sarah Anne. “Past climate, modern caves, and future resource management in speleothem paleoclimatology.” 2016. Web. 08 Mar 2021.
Vancouver:
Truebe SA. Past climate, modern caves, and future resource management in speleothem paleoclimatology. [Internet] [Thesis]. The University of Arizona; 2016. [cited 2021 Mar 08].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10158145.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Truebe SA. Past climate, modern caves, and future resource management in speleothem paleoclimatology. [Thesis]. The University of Arizona; 2016. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10158145
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of California – San Diego
30.
Tomczik, Douglas William.
Fish Production and Diversity across the Paleocene-Eocene Thermal Maximum: Evidence for Enhanced Export Production and Community Resilience.
Degree: Earth Sciences, 2014, University of California – San Diego
URL: http://www.escholarship.org/uc/item/0kf6x5dt
► A partial analog for modern global change is the Paleocene-Eocene Thermal Maximum (PETM) – a transient episode of warming and acidification at ~55.5 Ma that triggered…
(more)
▼ A partial analog for modern global change is the Paleocene-Eocene Thermal Maximum (PETM) – a transient episode of warming and acidification at ~55.5 Ma that triggered extinctions in deep sea biotas, extensive biogeographic shifts, and the appearance of `excursion biotas' (common occurrences of taxa restricted to the PETM interval). We analyzed the impact of the PETM on fish production and biodiversity using three deep sea sites in the Pacific and tropical Atlantic. Fossil fish teeth (ichthyoliths) mass accumulation rates show transient increases in fish production at all sites coincident with early stages of the PETM and exhibit little variation before and after the PETM. Fish tooth morphological diversity changes little across the PETM in both the equatorial Pacific and North Pacific gyre with larger changes at the equatorial Atlantic site. There is no evidence for the appearance of distinctive "excursion taxa" during the PETM, suggesting that fish experienced fewer geographic range shifts than calcareous and organic-walled plankton. The increase in ichthyolith accumulation, interpreted as export production at the PETM broadly matches published estimates of PETM export production from biogenic barium fluxes. Our findings contrast with model predictions for the next century, which suggest that increased global temperatures will lead to reduced subtropical fish production. Disparities between future Earth models and PETM data may reflect the different timescales of observation.
Subjects/Keywords: Geobiology; Paleoclimate science; Paleoecology; PETM
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APA (6th Edition):
Tomczik, D. W. (2014). Fish Production and Diversity across the Paleocene-Eocene Thermal Maximum: Evidence for Enhanced Export Production and Community Resilience. (Thesis). University of California – San Diego. Retrieved from http://www.escholarship.org/uc/item/0kf6x5dt
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tomczik, Douglas William. “Fish Production and Diversity across the Paleocene-Eocene Thermal Maximum: Evidence for Enhanced Export Production and Community Resilience.” 2014. Thesis, University of California – San Diego. Accessed March 08, 2021.
http://www.escholarship.org/uc/item/0kf6x5dt.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tomczik, Douglas William. “Fish Production and Diversity across the Paleocene-Eocene Thermal Maximum: Evidence for Enhanced Export Production and Community Resilience.” 2014. Web. 08 Mar 2021.
Vancouver:
Tomczik DW. Fish Production and Diversity across the Paleocene-Eocene Thermal Maximum: Evidence for Enhanced Export Production and Community Resilience. [Internet] [Thesis]. University of California – San Diego; 2014. [cited 2021 Mar 08].
Available from: http://www.escholarship.org/uc/item/0kf6x5dt.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tomczik DW. Fish Production and Diversity across the Paleocene-Eocene Thermal Maximum: Evidence for Enhanced Export Production and Community Resilience. [Thesis]. University of California – San Diego; 2014. Available from: http://www.escholarship.org/uc/item/0kf6x5dt
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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