subject:(Paleoclimate)

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 (6^th 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 (16^th 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 October 18, 2019. https://repository.library.brown.edu/studio/item/bdr:419502/.

MLA Handbook (7^th Edition):

Tzanova, Alexandrina. “Linking Late Miocene-Pliocene sea surface temperatures, terrestrial biome transitions and intensification of glaciation using alkenone paleothermometry.” 2015. Web. 18 Oct 2019.

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 2019 Oct 18]. 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)

Subjects/Keywords: Paleoclimate

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APA (6^th 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 (16^th Edition):

Theroux, Susanna. “Diversity and Ecology of Lacustrine Haptophyte Algae: Implications for Paleothermometry.” 2013. Doctoral Dissertation, Brown University. Accessed October 18, 2019. https://repository.library.brown.edu/studio/item/bdr:320529/.

MLA Handbook (7^th Edition):

Theroux, Susanna. “Diversity and Ecology of Lacustrine Haptophyte Algae: Implications for Paleothermometry.” 2013. Web. 18 Oct 2019.

Vancouver:

Theroux S. Diversity and Ecology of Lacustrine Haptophyte Algae: Implications for Paleothermometry. [Internet] [Doctoral dissertation]. Brown University; 2013. [cited 2019 Oct 18]. 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 (6^th 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 (16^th 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 October 18, 2019. https://repository.library.brown.edu/studio/item/bdr:386126/.

MLA Handbook (7^th 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. 18 Oct 2019.

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 2019 Oct 18]. 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 (6^th 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 (16^th Edition):

Tierney, Jessica Erin. “An Organic Geochemical Perspective on Tropical East African Paleoclimate.” 2010. Doctoral Dissertation, Brown University. Accessed October 18, 2019. https://repository.library.brown.edu/studio/item/bdr:11100/.

MLA Handbook (7^th Edition):

Tierney, Jessica Erin. “An Organic Geochemical Perspective on Tropical East African Paleoclimate.” 2010. Web. 18 Oct 2019.

Vancouver:

Tierney JE. An Organic Geochemical Perspective on Tropical East African Paleoclimate. [Internet] [Doctoral dissertation]. Brown University; 2010. [cited 2019 Oct 18]. 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/

University of Georgia

5. Cerajewski, Rebecca Jane. Paleoclimate reconstruction using isotopic analysis of tropical bivalves from the Pigeon Creek archaeological site, San Salvador Island, Bahamas.

Degree: MS, Geology, 2002, University of Georgia

URL: http://purl.galileo.usg.edu/uga_etd/cerajewski_rebe_j_200212_ms

► This research investigates the paleotemperatures of the northeastern Bahamas by comparing oxygen isotope records constructed from modern and archeological specimens of Codakia orbicularis, collected on… (more)

Subjects/Keywords: Paleoclimate

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APA (6^th Edition):

Cerajewski, R. J. (2002). Paleoclimate reconstruction using isotopic analysis of tropical bivalves from the Pigeon Creek archaeological site, San Salvador Island, Bahamas. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/cerajewski_rebe_j_200212_ms

Chicago Manual of Style (16^th Edition):

Cerajewski, Rebecca Jane. “Paleoclimate reconstruction using isotopic analysis of tropical bivalves from the Pigeon Creek archaeological site, San Salvador Island, Bahamas.” 2002. Masters Thesis, University of Georgia. Accessed October 18, 2019. http://purl.galileo.usg.edu/uga_etd/cerajewski_rebe_j_200212_ms.

MLA Handbook (7^th Edition):

Cerajewski, Rebecca Jane. “Paleoclimate reconstruction using isotopic analysis of tropical bivalves from the Pigeon Creek archaeological site, San Salvador Island, Bahamas.” 2002. Web. 18 Oct 2019.

Vancouver:

Cerajewski RJ. Paleoclimate reconstruction using isotopic analysis of tropical bivalves from the Pigeon Creek archaeological site, San Salvador Island, Bahamas. [Internet] [Masters thesis]. University of Georgia; 2002. [cited 2019 Oct 18]. Available from: http://purl.galileo.usg.edu/uga_etd/cerajewski_rebe_j_200212_ms.

Council of Science Editors:

Cerajewski RJ. Paleoclimate reconstruction using isotopic analysis of tropical bivalves from the Pigeon Creek archaeological site, San Salvador Island, Bahamas. [Masters Thesis]. University of Georgia; 2002. Available from: http://purl.galileo.usg.edu/uga_etd/cerajewski_rebe_j_200212_ms

6. Wu, Jiaying. A chironomid-based reconstruction of late Holocene climate change in southern Costa Rica.

Degree: MS, Geography, 2012, University of Georgia

URL: http://purl.galileo.usg.edu/uga_etd/wu_jiaying_201212_ms

► The modern distribution of sub-fossil chironomids in Costa Rica is described making use of a fifty-four lake calibration set. The relationship between modern chironomid distribution… (more)

Subjects/Keywords: Paleoclimate

…Bradley, 1999). Multiproxy paleoclimate reconstructions have provided rich evidence of… …which is located in the Central American Isthmus, has been a focus of intensive paleoclimate… …and paleoenvironmental research with numerous, multi-proxy lake and bog-based paleoclimate… …valuable in paleoclimate reconstruction (Porinchu and MacDonald, 2003; Potito et al., 2006… …Holocene paleoclimate conditions in southern Costa Rica, has three main objectives: 1)…

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APA (6^th Edition):

Wu, J. (2012). A chironomid-based reconstruction of late Holocene climate change in southern Costa Rica. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/wu_jiaying_201212_ms

Chicago Manual of Style (16^th Edition):

Wu, Jiaying. “A chironomid-based reconstruction of late Holocene climate change in southern Costa Rica.” 2012. Masters Thesis, University of Georgia. Accessed October 18, 2019. http://purl.galileo.usg.edu/uga_etd/wu_jiaying_201212_ms.

MLA Handbook (7^th Edition):

Wu, Jiaying. “A chironomid-based reconstruction of late Holocene climate change in southern Costa Rica.” 2012. Web. 18 Oct 2019.

Vancouver:

Wu J. A chironomid-based reconstruction of late Holocene climate change in southern Costa Rica. [Internet] [Masters thesis]. University of Georgia; 2012. [cited 2019 Oct 18]. Available from: http://purl.galileo.usg.edu/uga_etd/wu_jiaying_201212_ms.

Council of Science Editors:

Wu J. A chironomid-based reconstruction of late Holocene climate change in southern Costa Rica. [Masters Thesis]. University of Georgia; 2012. Available from: http://purl.galileo.usg.edu/uga_etd/wu_jiaying_201212_ms

Oregon State University

7. 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 (6^th 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 (16^th Edition):

Shakun, Jeremy D., 1981-. “Analyzing large paleoclimate datasets : implications for past and future climate change.” 2010. Doctoral Dissertation, Oregon State University. Accessed October 18, 2019. http://hdl.handle.net/1957/18836.

MLA Handbook (7^th Edition):

Shakun, Jeremy D., 1981-. “Analyzing large paleoclimate datasets : implications for past and future climate change.” 2010. Web. 18 Oct 2019.

Vancouver:

Shakun, Jeremy D. 1. Analyzing large paleoclimate datasets : implications for past and future climate change. [Internet] [Doctoral dissertation]. Oregon State University; 2010. [cited 2019 Oct 18]. 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

8. 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 (6^th 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 (16^th 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 October 18, 2019. 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 (7^th 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. 18 Oct 2019.

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 2019 Oct 18]. 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

9. 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)

Subjects/Keywords: Paleoclimate science

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APA (6^th 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 (16^th Edition):

Englebrecht, Amy. “Late Holocene Climate Change on Isla Isabela, Gulf of California.” 2010. Thesis, University of California – Berkeley. Accessed October 18, 2019. 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 (7^th Edition):

Englebrecht, Amy. “Late Holocene Climate Change on Isla Isabela, Gulf of California.” 2010. Web. 18 Oct 2019.

Vancouver:

Englebrecht A. Late Holocene Climate Change on Isla Isabela, Gulf of California. [Internet] [Thesis]. University of California – Berkeley; 2010. [cited 2019 Oct 18]. 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

West Virginia University

10. Maxwell, Richard Stockton. Hydroclimate reconstructions of the Potomac River Basin using tree rings.

Degree: PhD, Geology and Geography, 2010, West Virginia University

URL: https://researchrepository.wvu.edu/etd/3113

► The following dissertation is composed of three separate manuscripts with the overall theme of hydroclimate reconstructions of the Potomac River Basin. The first manuscript investigated… (more)

Subjects/Keywords: Paleoclimate science

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APA (6^th Edition):

Maxwell, R. S. (2010). Hydroclimate reconstructions of the Potomac River Basin using tree rings. (Doctoral Dissertation). West Virginia University. Retrieved from https://researchrepository.wvu.edu/etd/3113

Chicago Manual of Style (16^th Edition):

Maxwell, Richard Stockton. “Hydroclimate reconstructions of the Potomac River Basin using tree rings.” 2010. Doctoral Dissertation, West Virginia University. Accessed October 18, 2019. https://researchrepository.wvu.edu/etd/3113.

MLA Handbook (7^th Edition):

Maxwell, Richard Stockton. “Hydroclimate reconstructions of the Potomac River Basin using tree rings.” 2010. Web. 18 Oct 2019.

Vancouver:

Maxwell RS. Hydroclimate reconstructions of the Potomac River Basin using tree rings. [Internet] [Doctoral dissertation]. West Virginia University; 2010. [cited 2019 Oct 18]. Available from: https://researchrepository.wvu.edu/etd/3113.

Council of Science Editors:

Maxwell RS. Hydroclimate reconstructions of the Potomac River Basin using tree rings. [Doctoral Dissertation]. West Virginia University; 2010. Available from: https://researchrepository.wvu.edu/etd/3113

11. 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 (6^th 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 (16^th Edition):

Nichols, Jonathan E. “Reconstructing Holocene Hydroclimate in Eastern North America from Ombrotrophic Peatland Sediments.” 2010. Doctoral Dissertation, Brown University. Accessed October 18, 2019. https://repository.library.brown.edu/studio/item/bdr:11051/.

MLA Handbook (7^th Edition):

Nichols, Jonathan E. “Reconstructing Holocene Hydroclimate in Eastern North America from Ombrotrophic Peatland Sediments.” 2010. Web. 18 Oct 2019.

Vancouver:

Nichols JE. Reconstructing Holocene Hydroclimate in Eastern North America from Ombrotrophic Peatland Sediments. [Internet] [Doctoral dissertation]. Brown University; 2010. [cited 2019 Oct 18]. 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

12. 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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APA (6^th 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 (16^th Edition):

Bhattacharya, Tripti. “Causes and Impacts of Rainfall Variability In Central Mexico on Multiple Timescales.” 2016. Thesis, University of California – Berkeley. Accessed October 18, 2019. 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 (7^th Edition):

Bhattacharya, Tripti. “Causes and Impacts of Rainfall Variability In Central Mexico on Multiple Timescales.” 2016. Web. 18 Oct 2019.

Vancouver:

Bhattacharya T. Causes and Impacts of Rainfall Variability In Central Mexico on Multiple Timescales. [Internet] [Thesis]. University of California – Berkeley; 2016. [cited 2019 Oct 18]. 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

13. 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)

Subjects/Keywords: Paleoclimate Science; Geochemistry

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APA (6^th 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 (16^th Edition):

Lambert, Nolen Frank. “A multiproxy high resolution paleoclimate study of Lake Mirabad, Iran.” 2011. Thesis, California State University, Long Beach. Accessed October 18, 2019. 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 (7^th Edition):

Lambert, Nolen Frank. “A multiproxy high resolution paleoclimate study of Lake Mirabad, Iran.” 2011. Web. 18 Oct 2019.

Vancouver:

Lambert NF. A multiproxy high resolution paleoclimate study of Lake Mirabad, Iran. [Internet] [Thesis]. California State University, Long Beach; 2011. [cited 2019 Oct 18]. 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

14. 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)

Subjects/Keywords: Paleoclimate Science; Geochemistry

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APA (6^th 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 (16^th 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 October 18, 2019. 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 (7^th Edition):

White, Sarah Marie. “Millennial-scale Variability to 735 ka| High-resolution Climate Records from Santa Barbara Basin, CA.” 2013. Web. 18 Oct 2019.

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 2019 Oct 18]. 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

15. 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)

Subjects/Keywords: Geology; Paleoclimate science

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APA (6^th 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 (16^th 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 October 18, 2019. 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 (7^th Edition):

Nonu, Mounga E. “Eagle Lake Climate Change during the Holocene and during the Last 100 Years.” 2018. Web. 18 Oct 2019.

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 2019 Oct 18]. 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

16. Duncan, Bella. Cenozoic Antarctic climate evolution based on molecular and isotopic biomarker reconstructions from geological archives in the Ross Sea region.

Degree: 2017, Victoria University of Wellington

URL: http://hdl.handle.net/10063/6660

► During the Cenozoic Era (the last 65 Ma), Antarctica’s climate has evolved from ice free conditions of the ‘Greenhouse world’, which at its peak (~… (more)

▼ During the Cenozoic Era (the last 65 Ma), Antarctica’s climate has evolved from ice free conditions of the ‘Greenhouse world’, which at its peak (~ 55 Ma) supported near-tropical forests, to the ‘Icehouse’ climate of today with permanent ice sheets, and a very sparse macroflora. This long-term cooling trend is punctuated by a number of major, abrupt, and in some cases, irreversible climate transitions. Reconstructing past changes in vegetation, sea surface temperature, hydroclimate and the carbon cycle require robust geological proxies that in turn can provide insights into climatic thresholds and feedbacks that drove major transitions in the evolution of Antarctica’s ice sheets. Biomarkers allow climate and environmental proxy reconstructions for this region, where other more traditional paleoclimate methods are less suitable. This study has two aims. Firstly to assess the suitability and applicability of biomarkers in Antarctic sediments across a range of depositional settings and ages, and secondly to apply biomarker-based climate proxies to reconstruct environmental and climate conditions during key periods in the development of the Antarctic Ice Sheets. The distribution and abundances of n-alkanes are assessed in Oligocene and Miocene sediments from a terrestrial outcrop locality in the Transantarctic Mountains, and two glaciomarine sediment cores and an ice-distal deep marine core from the western Ross Sea. Comparisons are made with n-alkane distributions in Eocene glacial erratics and sedimentary rocks of the Mesozoic Beacon Supergroup, both likely sources of reworked material. A shift in dominant chain length from n-C₂₉ to n-C₂₇ occurs between the Late Eocene and Early Oligocene, considered a response to a significant climate cooling. Samples from glaciofluvial environments onshore, and subglacial and ice-proximal environments offshore display a reworked n-alkane distribution, characterised by low carbon preference index (CPI), high average chain length (ACL) and high n-C₂₉/n-C₂₇ values. Whereas, samples from lower-energy, more benign lacustrine and ice-distal marine environments predominantly contained contemporary material. Palynomorphs and biomarker proxies based on n-alkanes and glycerol dialkyl glycerol tetraethers (GDGTs) are applied to a Late Oligocene and Early Miocene glaciomarine succession spanning the large transient excursion of the Mi-1 glaciation (~23 Ma) in DSDP Site 270 drill core from the central Ross Sea. While the Late Oligocene is marked by relatively warm conditions, regional cooling initiated a transition into Mi-1. This was likely driven by a combination of decreasing atmospheric CO₂ and an orbital geometry favouring low seasonality and cool summers, leading to an intensification of proto-Antarctic bottom water production as the Ross Sea deepened and cooled. Mi-1 manifests as a regionally cool period, with minimum subsurface temperatures of ~4°C and onshore mean summer temperatures of ~8°C. A negative n-alkane δ¹³C excursion of up to 4.8‰ is interpreted as a vegetation response to… Advisors/Committee Members: McKay, Rob, Naish, Tim, Bendle, James.

Subjects/Keywords: Antarctica; Biomarkers; Paleoclimate

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APA (6^th Edition):

Duncan, B. (2017). Cenozoic Antarctic climate evolution based on molecular and isotopic biomarker reconstructions from geological archives in the Ross Sea region. (Doctoral Dissertation). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/6660

Chicago Manual of Style (16^th Edition):

Duncan, Bella. “Cenozoic Antarctic climate evolution based on molecular and isotopic biomarker reconstructions from geological archives in the Ross Sea region.” 2017. Doctoral Dissertation, Victoria University of Wellington. Accessed October 18, 2019. http://hdl.handle.net/10063/6660.

MLA Handbook (7^th Edition):

Duncan, Bella. “Cenozoic Antarctic climate evolution based on molecular and isotopic biomarker reconstructions from geological archives in the Ross Sea region.” 2017. Web. 18 Oct 2019.

Vancouver:

Duncan B. Cenozoic Antarctic climate evolution based on molecular and isotopic biomarker reconstructions from geological archives in the Ross Sea region. [Internet] [Doctoral dissertation]. Victoria University of Wellington; 2017. [cited 2019 Oct 18]. Available from: http://hdl.handle.net/10063/6660.

Council of Science Editors:

Duncan B. Cenozoic Antarctic climate evolution based on molecular and isotopic biomarker reconstructions from geological archives in the Ross Sea region. [Doctoral Dissertation]. Victoria University of Wellington; 2017. Available from: http://hdl.handle.net/10063/6660

Queens University

17. 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 (6^th 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 (16^th Edition):

Miller, Cody. “CENOZOIC EVOLUTION OF THE NULLARBOR PLAIN PALEOKARST, SOUTHERN AUSTRALIA .” 2012. Thesis, Queens University. Accessed October 18, 2019. 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 (7^th Edition):

Miller, Cody. “CENOZOIC EVOLUTION OF THE NULLARBOR PLAIN PALEOKARST, SOUTHERN AUSTRALIA .” 2012. Web. 18 Oct 2019.

Vancouver:

Miller C. CENOZOIC EVOLUTION OF THE NULLARBOR PLAIN PALEOKARST, SOUTHERN AUSTRALIA . [Internet] [Thesis]. Queens University; 2012. [cited 2019 Oct 18]. 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

Kent State University

18. 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 (6^th 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 (16^th 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 October 18, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=kent1566402595586501.

MLA Handbook (7^th Edition):

Ice, Bryan w. “RECONSTRUCTING THE PALEOCLIMATE OF THE MIDDLE DEVONIAN USING MARCELLUS SHALE GEOCHEMICAL SIGNATURES, SENECA FALLS, NY.” 2019. Web. 18 Oct 2019.

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 2019 Oct 18]. 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

19. 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 (6^th 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 (16^th 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 October 18, 2019. 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 (7^th Edition):

Millar, Ian William. “Baldcypress growth in South Carolina and Georgia| Lapses in its correlation with spring precipitation.” 2010. Web. 18 Oct 2019.

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 2019 Oct 18]. 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

20. 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)

Subjects/Keywords: Geology; Paleoclimate Science; Geochemistry

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APA (6^th 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 (16^th Edition):

Ayers, Meredith. “Stable isotopes of speleothems from the Yucatan Peninsula, Mexico.” 2010. Thesis, Northern Illinois University. Accessed October 18, 2019. 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 (7^th Edition):

Ayers, Meredith. “Stable isotopes of speleothems from the Yucatan Peninsula, Mexico.” 2010. Web. 18 Oct 2019.

Vancouver:

Ayers M. Stable isotopes of speleothems from the Yucatan Peninsula, Mexico. [Internet] [Thesis]. Northern Illinois University; 2010. [cited 2019 Oct 18]. 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

21. 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)

Subjects/Keywords: Anthropology, Archaeology; Paleoclimate Science

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APA (6^th 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 (16^th 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 October 18, 2019. 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 (7^th 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. 18 Oct 2019.

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 2019 Oct 18]. 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

22. 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

► Scope and Method of Study. We used modern analog technique to develop phytolith-based transfer functions. We applied these transfer functions to phytolith assemblages in… (more)

▼ Scope and Method of Study. 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. Findings and Conclusions. 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 C₄ grassland by 730 BP.

Subjects/Keywords: Climate Change; Paleoecology; Paleoclimate Science

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APA (6^th 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 (16^th Edition):

Joines, Jason Paul. “17,000 years of climate change| The phytolith record from Hall's Cave, Texas.” 2012. Thesis, Oklahoma State University. Accessed October 18, 2019. 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 (7^th Edition):

Joines, Jason Paul. “17,000 years of climate change| The phytolith record from Hall's Cave, Texas.” 2012. Web. 18 Oct 2019.

Vancouver:

Joines JP. 17,000 years of climate change| The phytolith record from Hall's Cave, Texas. [Internet] [Thesis]. Oklahoma State University; 2012. [cited 2019 Oct 18]. 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

23. 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)

Subjects/Keywords: Geology; Marine Geology; Paleoclimate Science

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APA (6^th 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 (16^th 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 October 18, 2019. 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 (7^th 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. 18 Oct 2019.

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 2019 Oct 18]. 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

24. 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)

Subjects/Keywords: Paleontology; Paleoecology; Paleoclimate Science

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APA (6^th 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 (16^th 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 October 18, 2019. 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 (7^th 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. 18 Oct 2019.

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 2019 Oct 18]. 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

25. 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 (pCO₂) using the stomatal proxy method on fossil plant… (more)

Subjects/Keywords: Paleontology; Biogeochemistry; Paleoclimate Science

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APA (6^th 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 (16^th 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 October 18, 2019. 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 (7^th 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. 18 Oct 2019.

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 2019 Oct 18]. 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

26. 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 (Planulina wuellerstorfi) 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 (6^th 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 (16^th Edition):

Venti, Nicholas L. “The role of the Kuroshio Extension in the Pliocene-Pleistocene climate transition.” 2012. Thesis, University of Delaware. Accessed October 18, 2019. 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 (7^th Edition):

Venti, Nicholas L. “The role of the Kuroshio Extension in the Pliocene-Pleistocene climate transition.” 2012. Web. 18 Oct 2019.

Vancouver:

Venti NL. The role of the Kuroshio Extension in the Pliocene-Pleistocene climate transition. [Internet] [Thesis]. University of Delaware; 2012. [cited 2019 Oct 18]. 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

27. 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 Callitris 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 (6^th 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 (16^th 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 October 18, 2019. 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 (7^th Edition):

Jones, Claudia Meredith. “Reconstruction of microbial and environmental conditions in an Australian hypersaline ecosystem from the mid-Pleistocene through the present.” 2012. Web. 18 Oct 2019.

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 2019 Oct 18]. 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

28. 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)

Subjects/Keywords: Sedimentary Geology; Paleoclimate Science

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th 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 (16^th 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 October 18, 2019. 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 (7^th Edition):

Fantozzi, Joanna Marie. “Reconstruction of hydrologic variability at Lake Elsinore, California, during the late-Glacial to Holocene transition.” 2011. Web. 18 Oct 2019.

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 2019 Oct 18]. 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

29. 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)

Subjects/Keywords: Geology; Paleoclimate Science; Geochemistry

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th 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 (16^th Edition):

Tierney, Jessica E. “An organic geochemical perspective on tropical East African paleoclimate.” 2010. Thesis, Brown University. Accessed October 18, 2019. 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 (7^th Edition):

Tierney, Jessica E. “An organic geochemical perspective on tropical East African paleoclimate.” 2010. Web. 18 Oct 2019.

Vancouver:

Tierney JE. An organic geochemical perspective on tropical East African paleoclimate. [Internet] [Thesis]. Brown University; 2010. [cited 2019 Oct 18]. 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

30. 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^th-20^th century but only subdued variability prior (15^th-18^th 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

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th 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 (16^th 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 October 18, 2019. 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 (7^th Edition):

Berkelhammer, Max B. “Perspectives on drought and temperature variability for the southwestern United States from a new hydro-isotopic network.” 2011. Web. 18 Oct 2019.

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 2019 Oct 18]. 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

Open Access Theses and Dissertations