subject:(Chemical oceanography)

University of California – San Diego

1. Briggs, Ellen. Expanding marine biogeochemical observations utilizing ISFET pH sensing technology and autonomous platforms.

Degree: Oceanography, 2017, University of California – San Diego

URL: http://www.escholarship.org/uc/item/1gc431rp

► The ocean plays an integral role in the global carbon cycle and serves as the largest planetary reservoir for carbon. As more anthropogenic CO2 is… (more)

Subjects/Keywords: Chemical oceanography

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APA (6^th Edition):

Briggs, E. (2017). Expanding marine biogeochemical observations utilizing ISFET pH sensing technology and autonomous platforms. (Thesis). University of California – San Diego. Retrieved from http://www.escholarship.org/uc/item/1gc431rp

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):

Briggs, Ellen. “Expanding marine biogeochemical observations utilizing ISFET pH sensing technology and autonomous platforms.” 2017. Thesis, University of California – San Diego. Accessed March 05, 2021. http://www.escholarship.org/uc/item/1gc431rp.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Briggs, Ellen. “Expanding marine biogeochemical observations utilizing ISFET pH sensing technology and autonomous platforms.” 2017. Web. 05 Mar 2021.

Vancouver:

Briggs E. Expanding marine biogeochemical observations utilizing ISFET pH sensing technology and autonomous platforms. [Internet] [Thesis]. University of California – San Diego; 2017. [cited 2021 Mar 05]. Available from: http://www.escholarship.org/uc/item/1gc431rp.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Briggs E. Expanding marine biogeochemical observations utilizing ISFET pH sensing technology and autonomous platforms. [Thesis]. University of California – San Diego; 2017. Available from: http://www.escholarship.org/uc/item/1gc431rp

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. Butler, Kristen Ann. Sulfur Cycling in the Cariaco Basin and the Meromictic Green Lake in Fayetteville, New York.

Degree: 2018, State University of New York at Stony Brook

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10622596

► An imbalance in the flux of oxidants and reductants to the suboxic zone (which lies between layers containing oxygen (O₂) and hydrogen sulfide (H₂S))… (more)

Subjects/Keywords: Chemical oceanography

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APA (6^th Edition):

Butler, K. A. (2018). Sulfur Cycling in the Cariaco Basin and the Meromictic Green Lake in Fayetteville, New York. (Thesis). State University of New York at Stony Brook. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10622596

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):

Butler, Kristen Ann. “Sulfur Cycling in the Cariaco Basin and the Meromictic Green Lake in Fayetteville, New York.” 2018. Thesis, State University of New York at Stony Brook. Accessed March 05, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=10622596.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Butler, Kristen Ann. “Sulfur Cycling in the Cariaco Basin and the Meromictic Green Lake in Fayetteville, New York.” 2018. Web. 05 Mar 2021.

Vancouver:

Butler KA. Sulfur Cycling in the Cariaco Basin and the Meromictic Green Lake in Fayetteville, New York. [Internet] [Thesis]. State University of New York at Stony Brook; 2018. [cited 2021 Mar 05]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10622596.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Butler KA. Sulfur Cycling in the Cariaco Basin and the Meromictic Green Lake in Fayetteville, New York. [Thesis]. State University of New York at Stony Brook; 2018. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10622596

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Florida State University

3. Rogers, Kelsey. Gulf of Mexico Recovery and Organic Matter Variability: A Tale of Two Sources.

Degree: PhD, Earth, Ocean, and Atmospheric Science, 2018, Florida State University

URL: http://purl.flvc.org/fsu/fd/2018_Su_Rogers_fsu_0071E_14610 ;

► The Deepwater Horizon (DWH) blowout of 2010 released an estimated 4.5-4.9 million barrels of oil and 500,000t of methane into the Gulf of Mexico (GOM).… (more)

▼ The Deepwater Horizon (DWH) blowout of 2010 released an estimated 4.5-4.9 million barrels of oil and 500,000t of methane into the Gulf of Mexico (GOM). Some of this oil rose to the surface, forming oil slicks, while an estimated 30% of the smaller particles and gasses formed a deep-water hydrocarbon plume between 1000-1200m (Ryerson et al., 2013; Valentine et al., 2010). The oil slicks at the surface covered a total area of 149,000km2 (MacDonald et al., 2015), but less than 0.01% of the gaseous hydrocarbons reached the surface (Kessler et al., 2011; Yvon-Lewis et al., 2011). After capping the wellhead and following natural and human remediation efforts, an estimated 11-30% of the oil was left unaccounted (Lehr et al., 2010). Studies of δ13C and Δ14C tracers in particulate organic carbon (POCsusp) in the water column and in sediments have shown the accumulation of fossil carbon in these pools. This dissertation explores the POC and sedimentary organic carbon pools using δ13C and Δ14C to characterize and track the recovery of these carbon pools following the DWH blowout. Due to the small particle size, residence time, and sensitivity to inputs, POCsusp provides a link between microbial processes in dissolved organic carbon and larger particles that pass carbon up the food web. Through this link we can evaluate the incorporation of hydrocarbons using δ13C and Δ14C. POCsusp was collected over 6 years from 43 sites across the Northern GOM. At the time of collection these sites were classified as seep or non-seep. We observed a wide range of natural variability in both δ13C (-17.8 to -35.4‰) and Δ14C (+71 to -755‰) throughout the water column. We found that deep-water POCsusp of the GOM was always more depleted than POCsusp from the euphotic zone. POCsusp collected from seeps was more depleted in Δ14C than non-seep sites. Endmember modeling indicated that in these particles, as much as 73% of the carbon was incorporated from oil. Four years following the blowout, we observed recovery in the Δ14C of deep-water POCsusp settling at a baseline of Δ14C=-164.4±18.9‰. We found the δ13C of POCsusp from the euphotic zone became more depleted over time, potentially due to the continuous incorporation of hydrocarbons. The deposition of oil in the sediments of the GOM has been estimated to be up to 14% of the total oil released (Valentine et al., 2014; Chanton et al, 2015), with marine oil snow as the primary mode of deposition. We employed inverse distance weighted interpolation to the surface sediment δ13C and Δ14C data. From these interpolations, we calculated the area affected by petrocarbon and followed its quantity through time. The area affected by petrocarbon decreased each year at a rate of -2x108 g/yr. Our maps indicated an east-west trend in depletion of both δ13C and Δ14C likely caused by the increasing importance of output from natural seeps and the Mississippi River. We also found significant differences between the sediment of the northern and southern GOM, with the north being much more depleted in δ13C and Δ14C than… Advisors/Committee Members: Jeffrey P. Chanton (professor directing dissertation), Tingting Zhao (university representative), Olivia Underwood Mason (committee member), Joseph Montoya (committee member), Yang Wang (committee member).

Subjects/Keywords: Chemical oceanography

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APA (6^th Edition):

Rogers, K. (2018). Gulf of Mexico Recovery and Organic Matter Variability: A Tale of Two Sources. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/2018_Su_Rogers_fsu_0071E_14610 ;

Chicago Manual of Style (16^th Edition):

Rogers, Kelsey. “Gulf of Mexico Recovery and Organic Matter Variability: A Tale of Two Sources.” 2018. Doctoral Dissertation, Florida State University. Accessed March 05, 2021. http://purl.flvc.org/fsu/fd/2018_Su_Rogers_fsu_0071E_14610 ;.

MLA Handbook (7^th Edition):

Rogers, Kelsey. “Gulf of Mexico Recovery and Organic Matter Variability: A Tale of Two Sources.” 2018. Web. 05 Mar 2021.

Vancouver:

Rogers K. Gulf of Mexico Recovery and Organic Matter Variability: A Tale of Two Sources. [Internet] [Doctoral dissertation]. Florida State University; 2018. [cited 2021 Mar 05]. Available from: http://purl.flvc.org/fsu/fd/2018_Su_Rogers_fsu_0071E_14610 ;.

Council of Science Editors:

Rogers K. Gulf of Mexico Recovery and Organic Matter Variability: A Tale of Two Sources. [Doctoral Dissertation]. Florida State University; 2018. Available from: http://purl.flvc.org/fsu/fd/2018_Su_Rogers_fsu_0071E_14610 ;

University of California – Santa Cruz

4. Broek, Taylor Alexander Borrius. New Perspectives on the Composition and Cycling of Dissolved Organic Carbon and Nitrogen in the Ocean.

Degree: Ocean Sciences, 2019, University of California – Santa Cruz

URL: http://www.escholarship.org/uc/item/9793s6hj

► Marine dissolved organic matter (DOM) is the largest pool of actively cycling organic carbon and nitrogen in the ocean. Despite the importance of DOM in… (more)

▼ Marine dissolved organic matter (DOM) is the largest pool of actively cycling organic carbon and nitrogen in the ocean. Despite the importance of DOM in biogeochemical cycles, understanding of its composition and cycling is limited, in part due to difficulty in isolating representative material. Here we present a new approach to DOM isolation via a sequential combination of ultrafiltration and solid phase extraction, which allowed the selective isolation of two fractions with different compositions and reactivities. By limiting the influence of reactivity mixtures, we were able to directly investigate the composition and cycling of both labile and refractory DOM. Measurements of bulk isotopic (Δ14C, δ13C, δ15N) and compositional (C/N ratio, 13C and 15N NMR) parameters confirmed the uniqueness of the two fractions. The ultrafiltered high molecular weight (HMW) fraction was younger and dominated by carbohydrate-like and protein-like molecules. In contrast, the low molecular weight (LMW) fraction was older and dominated by alicyclic carbon and heterocyclic nitrogen containing molecules. Spectroscopic studies have shown that the nitrogen-containing fraction of DOM (DON) is dominated by labile proteinaceous material. Despite this, other evidence suggests that a large fraction of DON is resistant to degradation. However, the paradigm of DON composition is based on measurements of HMW DON alone. Measurements of isotopic (δ15N, AA-Δ14C) and compositional (15N NMR, AA-D/L ratios) parameters of LMW DON provided a new perspective on the composition and cycling of DON in the ocean. Amino acids in LMW DON had both old radiocarbon ages and high D/L ratios, suggesting a bacterial mechanism capable of preserving proteinaceous material on millennial timescales. NMR analysis and nitrogen isotopic ratios demonstrated that LMW DON is dominated by heterocyclic nitrogen-containing molecules likely with intrinsically refractory molecular structures. These observations present a new paradigm for marine DON composition and suggest a mechanism for its long-term persistence.

Subjects/Keywords: Chemical oceanography

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APA (6^th Edition):

Broek, T. A. B. (2019). New Perspectives on the Composition and Cycling of Dissolved Organic Carbon and Nitrogen in the Ocean. (Thesis). University of California – Santa Cruz. Retrieved from http://www.escholarship.org/uc/item/9793s6hj

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):

Broek, Taylor Alexander Borrius. “New Perspectives on the Composition and Cycling of Dissolved Organic Carbon and Nitrogen in the Ocean.” 2019. Thesis, University of California – Santa Cruz. Accessed March 05, 2021. http://www.escholarship.org/uc/item/9793s6hj.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Broek, Taylor Alexander Borrius. “New Perspectives on the Composition and Cycling of Dissolved Organic Carbon and Nitrogen in the Ocean.” 2019. Web. 05 Mar 2021.

Vancouver:

Broek TAB. New Perspectives on the Composition and Cycling of Dissolved Organic Carbon and Nitrogen in the Ocean. [Internet] [Thesis]. University of California – Santa Cruz; 2019. [cited 2021 Mar 05]. Available from: http://www.escholarship.org/uc/item/9793s6hj.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Broek TAB. New Perspectives on the Composition and Cycling of Dissolved Organic Carbon and Nitrogen in the Ocean. [Thesis]. University of California – Santa Cruz; 2019. Available from: http://www.escholarship.org/uc/item/9793s6hj

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Maryland

5. Uy, Alan. Systems Engineering-Based Model Development: Application to Predictive Simulation of a Net-zero Home.

Degree: Chemical Engineering, 2017, University of Maryland

URL: http://hdl.handle.net/1903/19764

► Building design has grown increasingly sophisticated throughout the decades. In recent years, assessments of building performance and sustainability has grown in popularity as the U.S.… (more)

▼ Building design has grown increasingly sophisticated throughout the decades. In recent years, assessments of building performance and sustainability has grown in popularity as the U.S. Green Building Council published LEED certifications for new and existing constructs. The LEED rating system utilizes standards made by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) for areas in thermal comfort, air quality, energy building performance, and heat, ventilation, and air conditioning (HVAC) operation. Energy building performance has a more overarching role in this rating as the other three standards play into the overall loads associated with any building. Submittal of energy performance building reports for construction design and green building rating systems is becoming more common as building performance assessment software becomes more widely available. The University of Maryland currently is a participant in the Solar Decathlon intercollegiate competition sponsored by the Department of Energy. The University of Maryland's reACT team is working to construct a net-zero solar powered house for judging in Denver, CO in October 2017. Concurrently with the housing design, a substantial effort was put into assessing the projected building performance to aid in the design process and to set the stage for model-based home automation. While software such as OpenStudio and BEOPT are available and were used for year-averaged performance reports, a physically based model of the house was built from scratch to serve as a real-time simulation of virtual versions of reACT located in College Park, MD and Denver, CO and is described in detail as the Virtual House. The overall system design of the Virtual House can be described as a general set of inputs, dynamic simulation, and output of overall profiles. Inputs for the system include geometric design of the house, specified materials, schedules, daily weather data, and solar irradiance. Dynamic simulation refers to a simultaneous integration of both independent and dependent fluctuating loads upon the time of day regarding both heat and power balances. Finally, outputs showcase heat and power profiles throughout a day. The bulk of analysis of inputs and simulation has been rooted in fundamental calculations. In terms of future work, outputs coming from the Virtual House are currently being stored and are now looking towards validation with measured sensor data. As of now reACT is not in construction phase and measured data is unavailable. In order to validate the Virtual House, there are current plans to outfit the previous Solar Decathlon 2007 entry LEAFhouse with sensors. With this, measured and simulated data can be assessed after modifying the current Virtual House model for LEAFhouse specific inputs. Ultimately, work will be transitioned back to reACT as it is built with Solar Decathlon 2017 in mind. Advisors/Committee Members: Adomaitis, Raymond A. (advisor).

Subjects/Keywords: Chemical oceanography

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

APA (6^th Edition):

Uy, A. (2017). Systems Engineering-Based Model Development: Application to Predictive Simulation of a Net-zero Home. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/19764

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):

Uy, Alan. “Systems Engineering-Based Model Development: Application to Predictive Simulation of a Net-zero Home.” 2017. Thesis, University of Maryland. Accessed March 05, 2021. http://hdl.handle.net/1903/19764.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Uy, Alan. “Systems Engineering-Based Model Development: Application to Predictive Simulation of a Net-zero Home.” 2017. Web. 05 Mar 2021.

Vancouver:

Uy A. Systems Engineering-Based Model Development: Application to Predictive Simulation of a Net-zero Home. [Internet] [Thesis]. University of Maryland; 2017. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/1903/19764.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Uy A. Systems Engineering-Based Model Development: Application to Predictive Simulation of a Net-zero Home. [Thesis]. University of Maryland; 2017. Available from: http://hdl.handle.net/1903/19764

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Maryland

6. Christenson, Emily Ann. EFFECTS OF COMPLEXATION WITH THE SIDEROPHORE DESFERRIOXAMINE B ON TRANSITION METAL REMOVAL FROM SEAWATER.

Degree: Marine-Estuarine-Environmental Sciences, 2013, University of Maryland

URL: http://hdl.handle.net/1903/14695

► Complexation of transition metals with strong organic ligands of unknown structure and origin plays an important role in their behavior and distributions in seawater. I… (more)

Subjects/Keywords: Chemical oceanography

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APA (6^th Edition):

Christenson, E. A. (2013). EFFECTS OF COMPLEXATION WITH THE SIDEROPHORE DESFERRIOXAMINE B ON TRANSITION METAL REMOVAL FROM SEAWATER. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/14695

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):

Christenson, Emily Ann. “EFFECTS OF COMPLEXATION WITH THE SIDEROPHORE DESFERRIOXAMINE B ON TRANSITION METAL REMOVAL FROM SEAWATER.” 2013. Thesis, University of Maryland. Accessed March 05, 2021. http://hdl.handle.net/1903/14695.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Christenson, Emily Ann. “EFFECTS OF COMPLEXATION WITH THE SIDEROPHORE DESFERRIOXAMINE B ON TRANSITION METAL REMOVAL FROM SEAWATER.” 2013. Web. 05 Mar 2021.

Vancouver:

Christenson EA. EFFECTS OF COMPLEXATION WITH THE SIDEROPHORE DESFERRIOXAMINE B ON TRANSITION METAL REMOVAL FROM SEAWATER. [Internet] [Thesis]. University of Maryland; 2013. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/1903/14695.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Christenson EA. EFFECTS OF COMPLEXATION WITH THE SIDEROPHORE DESFERRIOXAMINE B ON TRANSITION METAL REMOVAL FROM SEAWATER. [Thesis]. University of Maryland; 2013. Available from: http://hdl.handle.net/1903/14695

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Southern California

7. Smail, Emily Ann. B-vitamins and trace metals in the Pacific Ocean| Ambient distribution and biological impacts.

Degree: 2013, University of Southern California

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3551556

► B-vitamins and trace metals have been implicated as important controllers of phytoplankton abundance and composition in the marine environment. In order to further establish… (more)

▼ B-vitamins and trace metals have been implicated as important controllers of phytoplankton abundance and composition in the marine environment. In order to further establish the distribution and biological importance of dissolved B-vitamin in the Pacific Ocean, I determined the environmental concentrations of B-vitamins, the vitamin B₁₂-dependent amino acid methionine, and the B₁₂-precursor cobalt in the Eastern Tropical Pacific (ETSP) and the subtropical North Pacific. The environmental relevance of some toxic trace metals was also established in the coastal ocean off Los Angeles, CA. The field data was complemented with targeted laboratory and field manipulation experiments to assist in the interpretation of environmental distributions. In the ETSP, I collected and analyzed depth-profile measurements of B₁₂, methionine, B₇, B₆, and cobalt at 6 stations with environmental conditions ranging from nutrient rich coastal stations to oligotrophic open ocean stations. Vitamin B₁₂ and methionine showed similar geographical distributions suggesting a potential control of vitamin B₁₂ on the synthesis of the amino acid likely due to B₁₂-dependent methionine synthase. Despite low cobalt levels in the ETSP (<20pM), vitamin B₁₂ distribution was only related to the trace metal's distribution in a nutrient rich coastal station suggesting that cobalt may only regulate B₁₂ in locations where other key macronutrients are plentiful. Vitamin B₆ showed a strong correlation with chlorophyll indicating that this vitamin may be related to photosynthetic activity. Vitamin B₇ showed a coastal input and incubation experiments showed that some phytoplankton may be limited by vitamin B7 in this region. Large areas of the ETSP were depleted of B-vitamins and vitamin concentrations were not clearly correlated with microbial abundance. In the subtropical North Pacific, the availability of dissolved thiamin (vitamin B₁) was related to nitrogen fixation rates due to the genomically identified thiamin auxotrophy of abundant group A cyanobacteria. Field B₁ amendment incubation experiments showed a 46% increase in nitrogen fixation and laboratory culture studies with an identified B₁ auxotroph showed a 127% increase in nitrogen fixation. Finally in the Los Angeles coastal ocean, the distribution of dissolved and particulate trace metals was examined in order to establish current levels of trace metal contamination in this region of the Pacific Ocean. Particulate levels were shown to be reduced dramatically compared to levels reported in the 1970s with decreases of ∼100-fold for Pb and ∼400-fold for Cu and Cd. Dissolved levels were found to be low with concentrations within the same range as an uncontaminated site in Punta Banda, Mexico. A trace metal uptake experiment with Synechococcus sp. CC9311 showed rapid internalization of multiple…

Subjects/Keywords: Chemical Oceanography; Biology, Oceanography

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APA (6^th Edition):

Smail, E. A. (2013). B-vitamins and trace metals in the Pacific Ocean| Ambient distribution and biological impacts. (Thesis). University of Southern California. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3551556

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):

Smail, Emily Ann. “B-vitamins and trace metals in the Pacific Ocean| Ambient distribution and biological impacts.” 2013. Thesis, University of Southern California. Accessed March 05, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=3551556.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Smail, Emily Ann. “B-vitamins and trace metals in the Pacific Ocean| Ambient distribution and biological impacts.” 2013. Web. 05 Mar 2021.

Vancouver:

Smail EA. B-vitamins and trace metals in the Pacific Ocean| Ambient distribution and biological impacts. [Internet] [Thesis]. University of Southern California; 2013. [cited 2021 Mar 05]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3551556.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Smail EA. B-vitamins and trace metals in the Pacific Ocean| Ambient distribution and biological impacts. [Thesis]. University of Southern California; 2013. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3551556

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

8. De Meo, Olivia. Studies of net community productivity in a near-coastal temperate ecosystem.

Degree: MS, 2011, University of New Hampshire

URL: https://scholars.unh.edu/thesis/682

► Understanding the biological contribution to the carbon cycle is important to accurately calculate oceanic carbon budgets. The biological contribution to air-sea flux can be… (more)

Subjects/Keywords: Biology; Oceanography; Chemical Oceanography

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APA (6^th Edition):

De Meo, O. (2011). Studies of net community productivity in a near-coastal temperate ecosystem. (Thesis). University of New Hampshire. Retrieved from https://scholars.unh.edu/thesis/682

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):

De Meo, Olivia. “Studies of net community productivity in a near-coastal temperate ecosystem.” 2011. Thesis, University of New Hampshire. Accessed March 05, 2021. https://scholars.unh.edu/thesis/682.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

De Meo, Olivia. “Studies of net community productivity in a near-coastal temperate ecosystem.” 2011. Web. 05 Mar 2021.

Vancouver:

De Meo O. Studies of net community productivity in a near-coastal temperate ecosystem. [Internet] [Thesis]. University of New Hampshire; 2011. [cited 2021 Mar 05]. Available from: https://scholars.unh.edu/thesis/682.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

De Meo O. Studies of net community productivity in a near-coastal temperate ecosystem. [Thesis]. University of New Hampshire; 2011. Available from: https://scholars.unh.edu/thesis/682

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

9. Klochko, Kateryna. An empirical re-evaluation of the boron isotope/pH proxy in marine carbonates.

Degree: 2009, University of Maryland, College Park

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3372972

► The boron isotopic composition measured in marine carbonates is considered to be a tracer of seawater pH. However, an accurate application of this proxy… (more)

Subjects/Keywords: Chemical Oceanography; Geochemistry

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APA (6^th Edition):

Klochko, K. (2009). An empirical re-evaluation of the boron isotope/pH proxy in marine carbonates. (Thesis). University of Maryland, College Park. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3372972

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):

Klochko, Kateryna. “An empirical re-evaluation of the boron isotope/pH proxy in marine carbonates.” 2009. Thesis, University of Maryland, College Park. Accessed March 05, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=3372972.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Klochko, Kateryna. “An empirical re-evaluation of the boron isotope/pH proxy in marine carbonates.” 2009. Web. 05 Mar 2021.

Vancouver:

Klochko K. An empirical re-evaluation of the boron isotope/pH proxy in marine carbonates. [Internet] [Thesis]. University of Maryland, College Park; 2009. [cited 2021 Mar 05]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3372972.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Klochko K. An empirical re-evaluation of the boron isotope/pH proxy in marine carbonates. [Thesis]. University of Maryland, College Park; 2009. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3372972

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

10. Krahforst, Christian F. The distribution and comparative biogeochemistry of silver with other selected trace metals in coastal waters near Massachusetts, USA.

Degree: 2011, University of Massachusetts Boston

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3433751

► Water samples and hydrologic data were collected during 1994-1996 in New England coastal waters near Massachusetts, USA to examine the distribution of silver and… (more)

▼ Water samples and hydrologic data were collected during 1994-1996 in New England coastal waters near Massachusetts, USA to examine the distribution of silver and other trace metals (Cu, Pb, Cd, Zn, and Fe) in the coastal systems of Massachusetts and Cape Cod Bays. These investigations were designed to test the hypothesis that silver could serve as a tracer of dispersion of municipal wastewater in Boston Harbor into Massachusetts and Cape Cod Bays and estimate the relative contribution of wastewater discharge to the overall silver budget of the Massachusetts Bays system. Silver concentrations in both particulate and filtered (<0.4 μm) fractions averaged 103 and 117 pmol kg^-1 for Boston Harbor, 34 and 10 pmol kg^-1 in western Massachusetts Bay, and 11 and 7 pmol kg^-1 in the central portion of Massachusetts Bay, respectively. Average Ag concentrations in southern Gulf of Maine coastal waters were 10 and 2 pmol kg^-1 for filtered and particulate fractions, respectively. While nearly half of the silver existed in particulate form in Boston Harbor, nearly 80% of the silver in Massachusetts and Cape Cod Bays occurred in the filterable fraction. Coastal water surveys revealed non-conservative Ag behavior and probably the result of incomplete mixing of three or more water masses with unique Ag signatures (e.g., Merrimack River, Boston Harbor, surface and intermediate Gulf of Maine waters). Quasi-steady state mass balance approaches estimate most of the silver entering into the Massachusetts Bays system during the study period was the result of municipal wastewater discharge to Boston Harbor (84-93%). Multivariate analyses were conducted to evaluate fundamental controls on the distribution and fate of Ag in Massachusetts coastal waters. The results of observations from water samples collected during surveys in Massachusetts Bays and the near coastal region of southwestern Gulf of Maine show that Ag is intermediate with respect to particulate reactivity when compared to the metals observed for this study and consistent with observations of Ag speciation in other coastal and open ocean systems. Exploratory factor analysis revealed behavior of Ag similar to that of Cu and Zn, and may reflect similar complexation potential with and preference for common ligand classes in the water column.

Subjects/Keywords: Chemical Oceanography; Biogeochemistry

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APA (6^th Edition):

Krahforst, C. F. (2011). The distribution and comparative biogeochemistry of silver with other selected trace metals in coastal waters near Massachusetts, USA. (Thesis). University of Massachusetts Boston. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3433751

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):

Krahforst, Christian F. “The distribution and comparative biogeochemistry of silver with other selected trace metals in coastal waters near Massachusetts, USA.” 2011. Thesis, University of Massachusetts Boston. Accessed March 05, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=3433751.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Krahforst, Christian F. “The distribution and comparative biogeochemistry of silver with other selected trace metals in coastal waters near Massachusetts, USA.” 2011. Web. 05 Mar 2021.

Vancouver:

Krahforst CF. The distribution and comparative biogeochemistry of silver with other selected trace metals in coastal waters near Massachusetts, USA. [Internet] [Thesis]. University of Massachusetts Boston; 2011. [cited 2021 Mar 05]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3433751.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Krahforst CF. The distribution and comparative biogeochemistry of silver with other selected trace metals in coastal waters near Massachusetts, USA. [Thesis]. University of Massachusetts Boston; 2011. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3433751

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Alaska Fairbanks

11. Turner, Jessica S. Investigating marine particle distributions and processes using in situ optical imaging in the Gulf of Alaska.

Degree: 2015, University of Alaska Fairbanks

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1605427

► The Gulf of Alaska is a seasonally productive ecosystem surrounded by glaciated coastal mountains with high precipitation. With a combination of high biological production,… (more)

▼ The Gulf of Alaska is a seasonally productive ecosystem surrounded by glaciated coastal mountains with high precipitation. With a combination of high biological production, inputs of suspended sediments from glacial runoff, and contrasting nutrient regimes in offshore and shelf environments, there is a great need to study particle cycling in this region. I measured the concentrations and size distributions of large marine particles (0.06-27 mm) during four cruises in 2014 and 2015 using the Underwater Vision Profiler (UVP). The UVP produces high resolution depth profiles of particle concentrations and size distributions throughout the water column, while generating individual images of objects >500 μm including marine snow particles and mesozooplankton. The objectives of this study were to 1) describe spatial variability in particle concentrations and size distributions, and 2) use that variability to identify driving processes. I hypothesized that UVP particle concentrations and size distributions would follow patterns in chlorophyll a concentrations. Results did not support this hypothesis. Instead, a major contrast between shelf and offshore particle concentrations and sizes was observed. Total concentrations of particles increased with proximity to glacial and fluvial inputs. Over the shelf, particle concentrations on the order of 1000-10,000/L were 1-2 orders of magnitude greater than offshore concentrations on the order of 100/L. Driving processes over the shelf included terrigenous inputs from land, resuspension of bottom sediments, and advective transport of those inputs along and across the shelf. Offshore, biological processes were drivers of spatial variability in particle concentration and size. High quantities of terrigenous sediments could have implications for enhanced particle flux due to ballasting effects and for offshore transport of particulate phase iron to the central iron-limited gyre. The dominance of resuspended material in shelf processes will inform the location of future studies of the biological pump in the coastal Gulf of Alaska. This work highlights the importance of continental margins in global biogeochemical processes.

Subjects/Keywords: Chemical oceanography; Biogeochemistry

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APA (6^th Edition):

Turner, J. S. (2015). Investigating marine particle distributions and processes using in situ optical imaging in the Gulf of Alaska. (Thesis). University of Alaska Fairbanks. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1605427

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):

Turner, Jessica S. “Investigating marine particle distributions and processes using in situ optical imaging in the Gulf of Alaska.” 2015. Thesis, University of Alaska Fairbanks. Accessed March 05, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=1605427.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Turner, Jessica S. “Investigating marine particle distributions and processes using in situ optical imaging in the Gulf of Alaska.” 2015. Web. 05 Mar 2021.

Vancouver:

Turner JS. Investigating marine particle distributions and processes using in situ optical imaging in the Gulf of Alaska. [Internet] [Thesis]. University of Alaska Fairbanks; 2015. [cited 2021 Mar 05]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1605427.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Turner JS. Investigating marine particle distributions and processes using in situ optical imaging in the Gulf of Alaska. [Thesis]. University of Alaska Fairbanks; 2015. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1605427

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

12. Manning, Cara C. Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers.

Degree: 2017, MIT and Woods Hole Oceanographic Institution

URL: http://hdl.handle.net/1912/8589

► In this thesis, I use coastal measurements of dissolved O2 and inert gases to provide insight into the chemical, biological, and physical processes that impact… (more)

▼ In this thesis, I use coastal measurements of dissolved O2 and inert gases to provide insight into the chemical, biological, and physical processes that impact the oceanic cycles of carbon and dissolved gases. Dissolved O2 concentration and triple isotopic composition trace net and gross biological productivity. The saturation states of inert gases trace physical processes, such as air-water gas exchange, temperature change, and mixing, that affect all gases. First, I developed a field-deployable system that measures Ne, Ar, Kr, and Xe gas ratios in water. It has precision and accuracy of 1 % or better, enables near-continuous measurements, and has much lower cost compared to existing laboratory-based methods. The system will increase the scientific community’s access to use dissolved noble gases as environmental tracers. Second, I measured O2 and five noble gases during a cruise in Monterey Bay, California. I developed a vertical model and found that accurately parameterizing bubble-mediated gas exchange was necessary to accurately simulate the He and Ne measurements. I present the first comparison of multiple gas tracer, incubation, and sediment trap-based productivity estimates in the coastal ocean. Net community production estimated from 15NO –3 uptake and O2/Ar gave equivalent results at steady state. Underway O2/Ar measurements revealed submesoscale variability that was not apparent from daily incubations. Third, I quantified productivity by O2 mass balance and air-water gas exchange by dual tracer (3He/SF6) release during ice melt in the Bras d’Or Lakes, a Canadian estuary. The gas transfer velocity at >90% ice cover was 6% of the rate for nearly ice-free conditions. Rates of volumetric gross primary production were similar when the estuary was completely ice-covered and ice-free, and the ecosystem was on average net autotrophic during ice melt and net heterotrophic following ice melt. I present a method for incorporating the isotopic composition of H2O into the O2 isotope-based productivity calculations, which increases the estimated gross primary production in this study by 46–97%. In summary, I describe a new noble gas analysis system and apply O2 and inert gas observations in new ways to study chemical, biological, and physical processes in coastal waters.

Subjects/Keywords: Gases; Chemical oceanography

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

APA (6^th Edition):

Manning, C. C. (2017). Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers. (Thesis). MIT and Woods Hole Oceanographic Institution. Retrieved from http://hdl.handle.net/1912/8589

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):

Manning, Cara C. “Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers.” 2017. Thesis, MIT and Woods Hole Oceanographic Institution. Accessed March 05, 2021. http://hdl.handle.net/1912/8589.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Manning, Cara C. “Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers.” 2017. Web. 05 Mar 2021.

Vancouver:

Manning CC. Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers. [Internet] [Thesis]. MIT and Woods Hole Oceanographic Institution; 2017. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/1912/8589.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Manning CC. Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers. [Thesis]. MIT and Woods Hole Oceanographic Institution; 2017. Available from: http://hdl.handle.net/1912/8589

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of California – San Diego

13. Stephens, Brandon. Nitrogen Cycling in the Euphotic Zone of the California Current.

Degree: Oceanography, 2018, University of California – San Diego

URL: http://www.escholarship.org/uc/item/1298v2jn

► Deep ocean nitrate supply to the surface euphotic zone of the California Current Ecosystem (CCE) increases rates of productivity and leads to an overall increase… (more)

▼ Deep ocean nitrate supply to the surface euphotic zone of the California Current Ecosystem (CCE) increases rates of productivity and leads to an overall increase in the fixed repository of dissolved and particulate organic matter (DOM and POM, respectively). Chapter II demonstrates that DOM production, in carbon units, can represent 12 ± 8% of nitrate-based production during low production periods and up to 28 ± 15% during highly productive periods. DOM can also accumulate in the surface CCE during post-bloom, surface stratified or iron-limited conditions, and therefore can represent a potentially exportable reservoir when subsequently subducted from the surface ocean. DOM production rates are comparable to regional sinking particle export rates, the combination of which matches net oxygen production rates as estimated in previous studies. While Chapters I and II demonstrate that deep ocean nitrate concentrations track patterns of surface productivity in the CCE, Chapter III tests whether all nitrate used in the surface ocean is derived from the dark ocean via upwelling. Stable isotopes of nitrate estimate that 6 - 36% of nitrate uptake is generated by nitrification occurring within the euphotic zone of the CCE. Rates of euphotic zone nitrification spanned 4 - 103 nmol L-1 d-1, rates of which extend to the surface ocean. A strong correlation between euphotic zone nitrification and nitrite concentrations led to the inference that either increased POM substrate or reduced phytoplankton abundance to be determinants of nitrification. Use of nitrate stable isotopes in Chapter IV demonstrates that surface nitrate utilization was enhanced at inshore CCE stations during the 2014 warm anomaly. The effect of utilization was detected as an isotopic enrichment in sinking and suspended POM and Calanus pacificus copepods. Nitrate sourced from the remnant mixed layer depth supports the food web, and was a source that was at times decoupled from deeper (200 - 400 m) nitrate. A relatively low 3.0 ± 0.5‰ nitrate uptake isotope effect corresponded with phytoplankton communities dominated by chlorophytes and flagellates. Data from Chapter IV support hypotheses that isotopes of upper ocean N reservoirs in the CCE will primarily reflect surface ocean nitrate dynamics.

Subjects/Keywords: Biogeochemistry; Chemical oceanography

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APA (6^th Edition):

Stephens, B. (2018). Nitrogen Cycling in the Euphotic Zone of the California Current. (Thesis). University of California – San Diego. Retrieved from http://www.escholarship.org/uc/item/1298v2jn

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):

Stephens, Brandon. “Nitrogen Cycling in the Euphotic Zone of the California Current.” 2018. Thesis, University of California – San Diego. Accessed March 05, 2021. http://www.escholarship.org/uc/item/1298v2jn.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Stephens, Brandon. “Nitrogen Cycling in the Euphotic Zone of the California Current.” 2018. Web. 05 Mar 2021.

Vancouver:

Stephens B. Nitrogen Cycling in the Euphotic Zone of the California Current. [Internet] [Thesis]. University of California – San Diego; 2018. [cited 2021 Mar 05]. Available from: http://www.escholarship.org/uc/item/1298v2jn.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Stephens B. Nitrogen Cycling in the Euphotic Zone of the California Current. [Thesis]. University of California – San Diego; 2018. Available from: http://www.escholarship.org/uc/item/1298v2jn

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Florida State University

14. Ebling, Alina M. (Alina Marie). The Biogeochemistry of Trace Elements in the Sea Surface Microlayer.

Degree: PhD, Earth, Ocean, and Atmospheric Science, 2016, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_2017SP_Ebling_fsu_0071E_13664 ;

► The aeolian transport of aerosols (mineral dust from desert areas, smoke and ash from biomass burning, and from anthropogenic emissions) is an important process for… (more)

▼ The aeolian transport of aerosols (mineral dust from desert areas, smoke and ash from biomass burning, and from anthropogenic emissions) is an important process for introducing bioactive trace elements to the surface ocean and can have a large impact on marine primary production. All material that enters the ocean from the atmosphere must pass through the air-sea interface, or sea surface microlayer. The microlayer is the physical link between the sea surface and lower atmosphere and is therefore tied to the global biogeochemical cycling of trace elements. The microlayer (50 – 200 µm thickness) is a unique environment with different physical, chemical, and biological properties compared to the underlying water column. The microlayer is dynamic in nature due to numerous non-equilibrium processes such as temperature fluctuations, salinity gradients, irradiance, and wind and wave actions that influence its biogeochemical properties. However, the microlayer is mechanically more stable than the underlying water column due to the higher concentration of surface-active organic compounds; creating a more rigid film-like layer over the surface of the ocean. It is an important, yet often ignored component in the biogeochemical cycling of trace elements in the marine environment due to the lack of trace element clean sampling and analysis methods. A novel technique, a hollow cylinder of ultra-pure SiO₂ (quartz glass) with a plastic handle, was developed to sample the microlayer for trace elements. This research also developed and optimized clean trace element techniques to accurately measure nine trace metals (Al, Mn, Fe, Co, Ni, Cu, Zn, Cd, and Pb) in the dissolved and particulate fractions of the microlayer and underlying water column. Initially, our research focused on the behavior of dissolved and particulate Al, Mn, Fe, Co, Cu, Zn, Cd, and Pb in the microlayer in a controlled tank experiment using a Saharan dust source. The residence times of the dissolved trace elements ranged from 1.8 hours for Fe to 15 hours for Cd. The residence times for the particulate trace elements ranged from 1.0 minutes for Al and Fe to 1.4 minutes for Mn. There was an initial release of dissolved trace elements to the microlayer from the Saharan dust. However, the reactive fraction of the suspended particles increased over time, indicative of scavenging. Based on the artificial dust deposition experiment, aerosols should be retained in the sea surface microlayer long enough to undergo chemical and physical alteration that affects the bioavailability of trace elements. Opportunistic bacteria (example: Vibrio spp.) have been shown to experience rapid growth during dust deposition events. Aerosols and microlayer samples were collected in the Florida Keys over the course of two years for analysis of dissolved and particulate Al, Mn, Fe, Co, Ni, Cu, Zn, and Pb. Trace element concentrations increased by factors of 2 to 5 in the microlayer during significant Saharan dust events. Residence times of dissolved trace elements ranged from 0.12 hours for Mn… Advisors/Committee Members: William M. Landing (professor directing dissertation), Albert E. Stiegman (university representative), Angela N. Knapp (committee member), Sven Alexander Kranz (committee member), Vincent J. M. Salters (committee member).

Subjects/Keywords: Chemical oceanography; Biogeochemistry

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):

Ebling, A. M. (. M. (2016). The Biogeochemistry of Trace Elements in the Sea Surface Microlayer. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_2017SP_Ebling_fsu_0071E_13664 ;

Chicago Manual of Style (16^th Edition):

Ebling, Alina M (Alina Marie). “The Biogeochemistry of Trace Elements in the Sea Surface Microlayer.” 2016. Doctoral Dissertation, Florida State University. Accessed March 05, 2021. http://purl.flvc.org/fsu/fd/FSU_2017SP_Ebling_fsu_0071E_13664 ;.

MLA Handbook (7^th Edition):

Ebling, Alina M (Alina Marie). “The Biogeochemistry of Trace Elements in the Sea Surface Microlayer.” 2016. Web. 05 Mar 2021.

Vancouver:

Ebling AM(M. The Biogeochemistry of Trace Elements in the Sea Surface Microlayer. [Internet] [Doctoral dissertation]. Florida State University; 2016. [cited 2021 Mar 05]. Available from: http://purl.flvc.org/fsu/fd/FSU_2017SP_Ebling_fsu_0071E_13664 ;.

Council of Science Editors:

Ebling AM(M. The Biogeochemistry of Trace Elements in the Sea Surface Microlayer. [Doctoral Dissertation]. Florida State University; 2016. Available from: http://purl.flvc.org/fsu/fd/FSU_2017SP_Ebling_fsu_0071E_13664 ;

Florida State University

15. Ebling, Alina M. (Alina Marie). The Biogeochemistry of Trace Elements in the Sea Surface Microlayer.

Degree: PhD, Earth, Ocean, and Atmospheric Science, 2016, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_2017SP_Ebling_fsu_0071E_13664 ;

► The aeolian transport of aerosols (mineral dust from desert areas, smoke and ash from biomass burning, and from anthropogenic emissions) is an important process for… (more)

▼ The aeolian transport of aerosols (mineral dust from desert areas, smoke and ash from biomass burning, and from anthropogenic emissions) is an important process for introducing bioactive trace elements to the surface ocean and can have a large impact on marine primary production. All material that enters the ocean from the atmosphere must pass through the air-sea interface, or sea surface microlayer. The microlayer is the physical link between the sea surface and lower atmosphere and is therefore tied to the global biogeochemical cycling of trace elements. The microlayer (50 – 200 µm thickness) is a unique environment with different physical, chemical, and biological properties compared to the underlying water column. The microlayer is dynamic in nature due to numerous non-equilibrium processes such as temperature fluctuations, salinity gradients, irradiance, and wind and wave actions that influence its biogeochemical properties. However, the microlayer is mechanically more stable than the underlying water column due to the higher concentration of surface-active organic compounds; creating a more rigid film-like layer over the surface of the ocean. It is an important, yet often ignored component in the biogeochemical cycling of trace elements in the marine environment due to the lack of trace element clean sampling and analysis methods. A novel technique, a hollow cylinder of ultra-pure SiO₂ (quartz glass) with a plastic handle, was developed to sample the microlayer for trace elements. This research also developed and optimized clean trace element techniques to accurately measure nine trace metals (Al, Mn, Fe, Co, Ni, Cu, Zn, Cd, and Pb) in the dissolved and particulate fractions of the microlayer and underlying water column. Initially, our research focused on the behavior of dissolved and particulate Al, Mn, Fe, Co, Cu, Zn, Cd, and Pb in the microlayer in a controlled tank experiment using a Saharan dust source. The residence times of the dissolved trace elements ranged from 1.8 hours for Fe to 15 hours for Cd. The residence times for the particulate trace elements ranged from 1.0 minutes for Al and Fe to 1.4 minutes for Mn. There was an initial release of dissolved trace elements to the microlayer from the Saharan dust. However, the reactive fraction of the suspended particles increased over time, indicative of scavenging. Based on the artificial dust deposition experiment, aerosols should be retained in the sea surface microlayer long enough to undergo chemical and physical alteration that affects the bioavailability of trace elements. Opportunistic bacteria (example: Vibrio spp.) have been shown to experience rapid growth during dust deposition events. Aerosols and microlayer samples were collected in the Florida Keys over the course of two years for analysis of dissolved and particulate Al, Mn, Fe, Co, Ni, Cu, Zn, and Pb. Trace element concentrations increased by factors of 2 to 5 in the microlayer during significant Saharan dust events. Residence times of dissolved trace elements ranged from 0.12 hours for Mn… Advisors/Committee Members: William M. Landing (professor directing dissertation), Albert E. Stiegman (university representative), Angela N. Knapp (committee member), Sven Alexander Kranz (committee member), Vincent J. M. Salters (committee member).

Subjects/Keywords: Chemical oceanography; Biogeochemistry

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Ebling, A. M. (. M. (2016). The Biogeochemistry of Trace Elements in the Sea Surface Microlayer. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_2017SP_Ebling_fsu_0071E_13664 ;

Chicago Manual of Style (16^th Edition):

Ebling, Alina M (Alina Marie). “The Biogeochemistry of Trace Elements in the Sea Surface Microlayer.” 2016. Doctoral Dissertation, Florida State University. Accessed March 05, 2021. http://purl.flvc.org/fsu/fd/FSU_2017SP_Ebling_fsu_0071E_13664 ;.

MLA Handbook (7^th Edition):

Ebling, Alina M (Alina Marie). “The Biogeochemistry of Trace Elements in the Sea Surface Microlayer.” 2016. Web. 05 Mar 2021.

Vancouver:

Ebling AM(M. The Biogeochemistry of Trace Elements in the Sea Surface Microlayer. [Internet] [Doctoral dissertation]. Florida State University; 2016. [cited 2021 Mar 05]. Available from: http://purl.flvc.org/fsu/fd/FSU_2017SP_Ebling_fsu_0071E_13664 ;.

Council of Science Editors:

Ebling AM(M. The Biogeochemistry of Trace Elements in the Sea Surface Microlayer. [Doctoral Dissertation]. Florida State University; 2016. Available from: http://purl.flvc.org/fsu/fd/FSU_2017SP_Ebling_fsu_0071E_13664 ;

Columbia University

16. Hayes, Christopher. Marine thorium and protactinium distributions: Tools for past and present chemical flux.

Degree: 2013, Columbia University

URL: https://doi.org/10.7916/D8320371

► Adsorption to sinking particulate matter, known as scavenging, is an important yet elusive term in the budgets of many bioactive and contaminant trace metals in… (more)

▼ Adsorption to sinking particulate matter, known as scavenging, is an important yet elusive term in the budgets of many bioactive and contaminant trace metals in the ocean. Scavenging is also involved in the cycling of other trace metals used in ocean sediments to learn about ocean processes, such as circulation rates or biological productivity, of the geologic past. This dissertation is an oceanographic exploration of the naturally-occurring radionuclides 230Th, 232Th and 231Pa aimed to better understand how their scavenging behavior can be utilized to trace chemical flux in the modern and the past ocean. While 230Th and 231Pa are produced by the radioactive decay of uranium dissolved in seawater, 232Th is added to the ocean via the input of continental material. Removal of Th by scavenging should be equivalent for both Th isotopes based on chemical principles. I use measured 232Th inventories from the North Pacific water column and apply a removal rate based on 234U:230Th disequilibria to estimate the flux of dissolved trace elements, such as the micro-nutrient Fe, to the ocean through the deposition of mineral dust (Chapter 2). Results from this study also raise the possibility of differing chemical behavior of the two Th isotopes in shallow water (<500 m depth) related to size-partitioning between truly dissolved and colloidal phases. Finally, results from the U.S. GEOTRACES North Atlantic Transect are used to investigate the relationship between 231Pa and 230Th in the water column and several of their proposed paleoceanographic purposes. The accuracy of 230Th as a proxy for constant sediment flux can be directly quantified to 40±10% with observations of boundary scavenging near the coast of Northwest Africa (Chapter 4). The 231Pa/230Th ratio in the water column is not clearly controlled by either ocean ventilation (Chapter 4) or particle composition (Chapter 5) alone. Near-bottom enhanced scavenging of both isotopes is also occurring over large regions, in benthic layers of resuspended sediments and in a hydrothermal plume emanating from the mid-Atlantic ridge. These novel observations must be reconciled in a new conceptual model, likely requiring future numerical modeling work, in order to clarify the use of the 231Pa/230Th ratio as a proxy for the Atlantic meridional overturning circulation.

Subjects/Keywords: Chemical oceanography; Geochemistry

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):

Hayes, C. (2013). Marine thorium and protactinium distributions: Tools for past and present chemical flux. (Doctoral Dissertation). Columbia University. Retrieved from https://doi.org/10.7916/D8320371

Chicago Manual of Style (16^th Edition):

Hayes, Christopher. “Marine thorium and protactinium distributions: Tools for past and present chemical flux.” 2013. Doctoral Dissertation, Columbia University. Accessed March 05, 2021. https://doi.org/10.7916/D8320371.

MLA Handbook (7^th Edition):

Hayes, Christopher. “Marine thorium and protactinium distributions: Tools for past and present chemical flux.” 2013. Web. 05 Mar 2021.

Vancouver:

Hayes C. Marine thorium and protactinium distributions: Tools for past and present chemical flux. [Internet] [Doctoral dissertation]. Columbia University; 2013. [cited 2021 Mar 05]. Available from: https://doi.org/10.7916/D8320371.

Council of Science Editors:

Hayes C. Marine thorium and protactinium distributions: Tools for past and present chemical flux. [Doctoral Dissertation]. Columbia University; 2013. Available from: https://doi.org/10.7916/D8320371

17. Barner, Alison. Investigation of chromophoric dissolved organic matter as a freshwater tracer in the Kennebec River Estuary.

Degree: MS, 2012, University of New Hampshire

URL: https://scholars.unh.edu/thesis/712

► In an attempt to explore the feasibility of using chromophoric dissolved organic matter (CDOM) as a freshwater tracer in the Kennebec Estuary of Maine,… (more)

Subjects/Keywords: Chemical Oceanography; Biogeochemistry

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

APA (6^th Edition):

Barner, A. (2012). Investigation of chromophoric dissolved organic matter as a freshwater tracer in the Kennebec River Estuary. (Thesis). University of New Hampshire. Retrieved from https://scholars.unh.edu/thesis/712

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):

Barner, Alison. “Investigation of chromophoric dissolved organic matter as a freshwater tracer in the Kennebec River Estuary.” 2012. Thesis, University of New Hampshire. Accessed March 05, 2021. https://scholars.unh.edu/thesis/712.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Barner, Alison. “Investigation of chromophoric dissolved organic matter as a freshwater tracer in the Kennebec River Estuary.” 2012. Web. 05 Mar 2021.

Vancouver:

Barner A. Investigation of chromophoric dissolved organic matter as a freshwater tracer in the Kennebec River Estuary. [Internet] [Thesis]. University of New Hampshire; 2012. [cited 2021 Mar 05]. Available from: https://scholars.unh.edu/thesis/712.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Barner A. Investigation of chromophoric dissolved organic matter as a freshwater tracer in the Kennebec River Estuary. [Thesis]. University of New Hampshire; 2012. Available from: https://scholars.unh.edu/thesis/712

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

West Virginia University

18. Velaga, Srinath Chowdary. Stability of Methane-Ethane-Propane Mixed Gas Hydrates under Deep Water Conditions.

Degree: PhD, Chemical and Biomedical Engineering, 2014, West Virginia University

URL: https://doi.org/10.33915/etd.173 ; https://researchrepository.wvu.edu/etd/173

► Methane hydrates are globally distributed in sediments along the continental margins and potentially contain more energy than all fossil fuel reserves. However, methane is also… (more)

▼ Methane hydrates are globally distributed in sediments along the continental margins and potentially contain more energy than all fossil fuel reserves. However, methane is also a potential greenhouse gas which could play a major role in global climate change. Understanding the stability of gas hydrates can help us to understand their role in the climate change. Three main factors affect the stability of hydrates: Temperature (T), Pressure (P) and composition. Hydrates become unstable when they are exposed to pressures and temperatures outside the hydrate stability zone (HSZ) in a process commonly called dissociation. However, hydrates can also become unstable even when the pressure and temperature are within the HSZ but the concentrations of the hydrate forming gases are below their fully-saturated levels in the surrounding water phase. This process can be described as dissolution. In situ observations of marine outcrops of gas hydrates indicate that these hydrates exposed to surrounding seawater are more stable than predicted using diffusion-controlled models based on the surrounding methane saturations.;Naturally-occurring hydrates may not be simple structure I (sI) methane hydrates and may contain higher hydrocarbons like ethane, propane etc., which forms structure II (sII) hydrates. Therefore, these mixed hydrates may act to stabilize the hydrates. In this work, the dissolution of sII hydrates in the presence of water has been studied using molecular dynamics (MD) simulations to understand if and how the presence of ethane and propane may stabilize the hydrate. Lattice constants for sII hydrates were calculated and compared to experimental values to validate the OPLS potentials used for the hydrocarbon guest molecules. The effect of higher hydrocarbons, such as ethane and propane, on the stability of gas hydrate was studied by changing the composition in the hydrate phase keeping the methane composition constant in the large cage and small cages. Also, the effect of methane composition was also studied by changing the methane occupancy in large and small cages. MD simulations reveal that the fully occupied hydrate is more stable than the presence of empty cages. The number of methane molecules moved into the liquid phase from the hydrate phase has been increased with the decrease in the large cage occupancy. No effect was found on the dissolution of sII hydrate by changing the small cage occupancy from 100% to 81.5%. The dissolution of sII hydrate was linear in the first few nanometers of the simulations and then observed an oscillatory behavior; this oscillatory behavior is due to the hydrate formation and dissociation at the hydrate-water layer interface.;The probable phase in the marine sediments can be a two phase hydrate (H)-Liquid water (Lw) thermodynamic equilibrium in the absence of vapor phase. Understanding the fate and transport of hydrocarbons and hydrocarbon mixtures in the deepsea and underlying sediments requires accurate determination of this two phase H-Lw thermodynamic equilibrium in the absence… Advisors/Committee Members: Brian J. Anderson, Ismail Celik, Brian Popp.

Subjects/Keywords: Chemical engineering; Chemical oceanography

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APA (6^th Edition):

Velaga, S. C. (2014). Stability of Methane-Ethane-Propane Mixed Gas Hydrates under Deep Water Conditions. (Doctoral Dissertation). West Virginia University. Retrieved from https://doi.org/10.33915/etd.173 ; https://researchrepository.wvu.edu/etd/173

Chicago Manual of Style (16^th Edition):

Velaga, Srinath Chowdary. “Stability of Methane-Ethane-Propane Mixed Gas Hydrates under Deep Water Conditions.” 2014. Doctoral Dissertation, West Virginia University. Accessed March 05, 2021. https://doi.org/10.33915/etd.173 ; https://researchrepository.wvu.edu/etd/173.

MLA Handbook (7^th Edition):

Velaga, Srinath Chowdary. “Stability of Methane-Ethane-Propane Mixed Gas Hydrates under Deep Water Conditions.” 2014. Web. 05 Mar 2021.

Vancouver:

Velaga SC. Stability of Methane-Ethane-Propane Mixed Gas Hydrates under Deep Water Conditions. [Internet] [Doctoral dissertation]. West Virginia University; 2014. [cited 2021 Mar 05]. Available from: https://doi.org/10.33915/etd.173 ; https://researchrepository.wvu.edu/etd/173.

Council of Science Editors:

Velaga SC. Stability of Methane-Ethane-Propane Mixed Gas Hydrates under Deep Water Conditions. [Doctoral Dissertation]. West Virginia University; 2014. Available from: https://doi.org/10.33915/etd.173 ; https://researchrepository.wvu.edu/etd/173

The Florida State University

19. Fitzhugh, Linda Mueller. Using changes in biomass and productivity to discern anthropogenic impacts in aquatic ecosystems.

Degree: 2011, The Florida State University

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3477205

► The purpose of these studies was to monitor changes in two aquatic ecosystems that represent end members along a continuum of human impacts. St.… (more)

▼ The purpose of these studies was to monitor changes in two aquatic ecosystems that represent end members along a continuum of human impacts. St. Andrew Bay in Panama City, Florida, USA, has been impacted by humans since it formed about 5,000 years ago; however these impacts have accelerated in the last 150 years as industrialization took place. In contrast, the peatlands north of High Level, Alberta, Canada, are located in a region where human population and development are minimal, yet these remote areas do not appear to be immune to the global climate change that resulted from the industrial revolution. This work describes the effects of water quality on seagrass distribution and epiphyte growth in St. Andrew Bay and it shows how climate change affects peat deposits north of High Level. Water quality has been monitored in St. Andrew Bay since 1990 and these data were coupled with seagrass monitoring data collected since 2000 and five aerial photos taken since 1953 to better determine the extent of seagrass losses in the bay system. The St. Andrew Bay system is composed of four smaller bays: West Bay, North Bay, St. Andrew Bay, and East Bay, and although there has been no systemic decline in seagrass coverage in North Bay, St. Andrew Bay, and East Bay, approximately half of the seagrasses in West Bay have been destroyed or degraded since 1953. Comparisons among these smaller bays show higher turbidities, higher chlorophyll a concentrations, and increased epiphyte growth rates in West Bay which result in shallower seagrass depths. Although the initial cause of seagrass loss in West Bay is unknown, the present eutrophication of this area will make it harder for seagrasses to recover. Furthermore, the future development of over 30,000 acres within West Bay's watershed surrounding a new international airport and industrial complex does not bode well for this stressed ecosystem. Although the peatlands of Canada are located in an area where human impacts are minimal, these ecosystems are still at risk from indirect stressors such a global climate change. Peatlands formed approximately 7,000 years ago as shallow lakes filled in with vegetation; eventually the accumulating vegetation insulated the ground allowing permafrost to form. Over the past 60 years however, global temperatures have increased, the direct result of increased carbon dioxide levels that started to climb after the industrial revolution. This warmer climate decreases the ability of peat to sufficiently insulate the ground allowing the permafrost to melt. Relatively small, shallow collapse scar bogs have now formed within the permafrost plateau and this creates wet depressions where primary productivity increases. Peat cores were removed from several bogs north of High Level, Alberta, and the age of the successive layers in the peat were determined using ²¹⁰Pb and the Constant Rate of Supply (CRS) model. Ages derived from the activity of ¹³⁷Cs in two cores were used to corroborate these…

Subjects/Keywords: Chemical Oceanography; Biology, Oceanography; Environmental Studies

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APA (6^th Edition):

Fitzhugh, L. M. (2011). Using changes in biomass and productivity to discern anthropogenic impacts in aquatic ecosystems. (Thesis). The Florida State University. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3477205

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):

Fitzhugh, Linda Mueller. “Using changes in biomass and productivity to discern anthropogenic impacts in aquatic ecosystems.” 2011. Thesis, The Florida State University. Accessed March 05, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=3477205.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Fitzhugh, Linda Mueller. “Using changes in biomass and productivity to discern anthropogenic impacts in aquatic ecosystems.” 2011. Web. 05 Mar 2021.

Vancouver:

Fitzhugh LM. Using changes in biomass and productivity to discern anthropogenic impacts in aquatic ecosystems. [Internet] [Thesis]. The Florida State University; 2011. [cited 2021 Mar 05]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3477205.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Fitzhugh LM. Using changes in biomass and productivity to discern anthropogenic impacts in aquatic ecosystems. [Thesis]. The Florida State University; 2011. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3477205

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of South Carolina

20. Burrell, Christopher Thomas. Understanding the fate of the neurotoxin domoic acid in coastal systems.

Degree: 2012, University of South Carolina

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1503293

► Pseudo-nitzschia is among a genus of phytoplankton known to produce toxins that negatively impact a wide range of organisms, including mankind. These blooms occur… (more)

Subjects/Keywords: Chemical Oceanography; Environmental Health

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APA (6^th Edition):

Burrell, C. T. (2012). Understanding the fate of the neurotoxin domoic acid in coastal systems. (Thesis). University of South Carolina. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1503293

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):

Burrell, Christopher Thomas. “Understanding the fate of the neurotoxin domoic acid in coastal systems.” 2012. Thesis, University of South Carolina. Accessed March 05, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=1503293.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Burrell, Christopher Thomas. “Understanding the fate of the neurotoxin domoic acid in coastal systems.” 2012. Web. 05 Mar 2021.

Vancouver:

Burrell CT. Understanding the fate of the neurotoxin domoic acid in coastal systems. [Internet] [Thesis]. University of South Carolina; 2012. [cited 2021 Mar 05]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1503293.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Burrell CT. Understanding the fate of the neurotoxin domoic acid in coastal systems. [Thesis]. University of South Carolina; 2012. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1503293

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

The University of North Carolina at Chapel Hill

21. Gibson, Patrick Jonathan. Ecosystem Impacts of Carbon and Nitrogen Cycling by Coral Reef Sponges.

Degree: 2011, The University of North Carolina at Chapel Hill

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3477550

► Sponges and their associated microbial communities are capable of dramatically altering the water chemistry of their surrounding environment by rapidly pumping water through their… (more)

Subjects/Keywords: Biology, Ecology; Chemical Oceanography; Biogeochemistry

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APA (6^th Edition):

Gibson, P. J. (2011). Ecosystem Impacts of Carbon and Nitrogen Cycling by Coral Reef Sponges. (Thesis). The University of North Carolina at Chapel Hill. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3477550

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):

Gibson, Patrick Jonathan. “Ecosystem Impacts of Carbon and Nitrogen Cycling by Coral Reef Sponges.” 2011. Thesis, The University of North Carolina at Chapel Hill. Accessed March 05, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=3477550.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gibson, Patrick Jonathan. “Ecosystem Impacts of Carbon and Nitrogen Cycling by Coral Reef Sponges.” 2011. Web. 05 Mar 2021.

Vancouver:

Gibson PJ. Ecosystem Impacts of Carbon and Nitrogen Cycling by Coral Reef Sponges. [Internet] [Thesis]. The University of North Carolina at Chapel Hill; 2011. [cited 2021 Mar 05]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3477550.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gibson PJ. Ecosystem Impacts of Carbon and Nitrogen Cycling by Coral Reef Sponges. [Thesis]. The University of North Carolina at Chapel Hill; 2011. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3477550

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of South Florida

22. Ithier-Guzman, Warner. Assessing the ability of soils and sediment to adsorb and retain Cs-137 in Puerto Rico.

Degree: 2010, University of South Florida

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3425691

► As part of the radioactive exercises taking place around the world anthropogenic radionuclides were introduce to Puerto Rico’s terrestrial and aquatic environments beginning in… (more)

▼ As part of the radioactive exercises taking place around the world anthropogenic radionuclides were introduce to Puerto Rico’s terrestrial and aquatic environments beginning in 1962. Two major projects took place in the island, the Rain Forest Project and the construction of a Boiling Superheat Nuclear Power Plant (BONUS). While in operation several accidental shutdowns occurred at the BONUS facility. One of these accidental shutdowns released 582 MBq into the nearby environment. Vieques an island located few miles east of the main island has received anthropogenic inputs of heavy metals resulting from military practices conducted by the US Navy. Due to the potential presence of Cs-137 in soils and sediments in Puerto Rico a radiological assessment was performed. Downcore soil and sediment analysis as well as surface samples analysis was conduct in these three sites indicating the presence of Cs-137. Activity range varies among site from below detection limit to 12 dpm/g at Vieques, 15 dpm/g at Espiritu Santo Estuary and 12 dpm/g at the BONUS Facility. ICP-OES analysis indicates the existence of an oxic environment at the sedimentary system of the island. Cs-137 retention is strongly influenced by particle grain size and at the study sites clay was present in less than 20% for most sites. An X-ray diffraction analysis show that kaolinite and smectite are present at all sampling sites and illite is absent. To further analysis the ability of soil and sediments to retain adsorption and desorption was conducted using clay reference material and samples from the island. All samples, reference and natural, used in the study were placed in an aqueous solution that contained MES buffer (5.0 micromol, pKa of 6.1), ammonium nitrate (0.010 M) and the five metals (individual concentrations ranged from 0.48 micromol to 1.6 micromol). Solution pH was adjusted by titration with acid or base, depending on the nature of the sample. Results were quantified as distribution coefficients. These results indicate that the absorption and retention of Cs-137 in the sediments in Puerto Rico is driven by the mineralogy of the site.

Subjects/Keywords: Chemical Oceanography; Environmental Sciences; Geochemistry

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APA (6^th Edition):

Ithier-Guzman, W. (2010). Assessing the ability of soils and sediment to adsorb and retain Cs-137 in Puerto Rico. (Thesis). University of South Florida. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3425691

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):

Ithier-Guzman, Warner. “Assessing the ability of soils and sediment to adsorb and retain Cs-137 in Puerto Rico.” 2010. Thesis, University of South Florida. Accessed March 05, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=3425691.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ithier-Guzman, Warner. “Assessing the ability of soils and sediment to adsorb and retain Cs-137 in Puerto Rico.” 2010. Web. 05 Mar 2021.

Vancouver:

Ithier-Guzman W. Assessing the ability of soils and sediment to adsorb and retain Cs-137 in Puerto Rico. [Internet] [Thesis]. University of South Florida; 2010. [cited 2021 Mar 05]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3425691.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ithier-Guzman W. Assessing the ability of soils and sediment to adsorb and retain Cs-137 in Puerto Rico. [Thesis]. University of South Florida; 2010. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3425691

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of California – Santa Cruz

23. Zurbrick, Cheryl Marie. Asian anthropogenic lead contamination in the North Pacific Ocean as evidenced by stable lead isotopic compositions.

Degree: Microbiology and Environmental Toxicology, 2014, University of California – Santa Cruz

URL: http://www.escholarship.org/uc/item/9h7090xn

► This dissertation work determined the changing scope of lead (Pb) contamination in the North Pacific Ocean since the phase-out of leaded gasoline in most of… (more)

▼ This dissertation work determined the changing scope of lead (Pb) contamination in the North Pacific Ocean since the phase-out of leaded gasoline in most of the world. Chapters 1 and 2 consisted of validating our method for determining Pb concentrations and isotopic compositions in seawater. Chapter 3 established a baseline of Pb isotopic compositions (PbICs) in the western and central North Pacific in 2002. This was an ideal time to establish such a baseline because China had recently (mid-2000) ceased their use of leaded gasoline and simultaneously began consuming increasingly large amounts of coal, known to have relatively high Pb concentrations. We found subsurface waters were contaminated with Asian industrial Pb, predominantly Chinese coal emissions. In contrast, the abyssal waters were a mix of Asian industrial Pb and background (i.e., natural) Pb. Chapter 4 revisited the western and central North Pacific in 2009 - 2011 to determine what, if any, changes had occurred in this short time period. We found that Pb in subsurface and abyssal waters of the western North Pacific were similar to Chinese aerosols. Such a large change in the PbICs of abyssal water in 9 years was unanticipated and attributed to the relatively large flux of particle-bound Pb from the euphotic zone to the deep ocean, which was in isotopic equilibrium with the reservoir of dissolved Pb. In contrast, the central North Pacific abyssal water PbICs were similar to values previously reported because of the relatively lower particulate export. Based on comparisons to baseline PbIC data, we determined that abyssal waters in the western and central North Pacific would be isotopically indistinguishable from surface waters in the next three decades. Sources of Pb to coastal California waters were reevaluated in Chapter 5. Prior studies had found that surface waters of the California Current System (CCS) were isotopically consistent with both Asian industrial Pb and US leaded gasoline, still in use at that point in time. In 2010 and 2011, we found that surface and subsurface waters of the CCS were isotopically similar to Asian industrial emissions. However, remobilized US gasoline Pb from sediments in the San Francisco Bay, California, were accumulating in the "mud belt" on the continental shelf and changing the isotopic composition of overlying waters. During periods of intense upwelling, this historic Pb was brought to the surface of the water. However, the much larger quantity of Pb from Asian industrial emissions made the isotopic composition of Pb from historic US gasoline unidentifiable in off-shore waters. A secondary research focus of this dissertation was to improve my own teaching abilities. Chapter 6 explored the intersection of system thinking and aquatic toxicology in undergraduate education. Among a wealth of information, I found that group concept mapping was no more useful to student learning than the same activity done individually. This was due to poor implementation of team learning strategies by me and inadequate time for students…

Subjects/Keywords: Chemical oceanography; Science education

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APA (6^th Edition):

Zurbrick, C. M. (2014). Asian anthropogenic lead contamination in the North Pacific Ocean as evidenced by stable lead isotopic compositions. (Thesis). University of California – Santa Cruz. Retrieved from http://www.escholarship.org/uc/item/9h7090xn

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):

Zurbrick, Cheryl Marie. “Asian anthropogenic lead contamination in the North Pacific Ocean as evidenced by stable lead isotopic compositions.” 2014. Thesis, University of California – Santa Cruz. Accessed March 05, 2021. http://www.escholarship.org/uc/item/9h7090xn.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zurbrick, Cheryl Marie. “Asian anthropogenic lead contamination in the North Pacific Ocean as evidenced by stable lead isotopic compositions.” 2014. Web. 05 Mar 2021.

Vancouver:

Zurbrick CM. Asian anthropogenic lead contamination in the North Pacific Ocean as evidenced by stable lead isotopic compositions. [Internet] [Thesis]. University of California – Santa Cruz; 2014. [cited 2021 Mar 05]. Available from: http://www.escholarship.org/uc/item/9h7090xn.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zurbrick CM. Asian anthropogenic lead contamination in the North Pacific Ocean as evidenced by stable lead isotopic compositions. [Thesis]. University of California – Santa Cruz; 2014. Available from: http://www.escholarship.org/uc/item/9h7090xn

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

24. Wilcox Freeburg, Eric D. Exploring the link between otolith growth and function along the biological continuum in the context of ocean acidification.

Degree: 2014, University of Massachusetts Boston

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3622214

► Oceans are acidifying as atmospheric CO₂ is drawn down. This process, known as ocean acidification (OA), is well known and documented. Over the next… (more)

▼ Oceans are acidifying as atmospheric CO₂ is drawn down. This process, known as ocean acidification (OA), is well known and documented. Over the next 100 years, pH of the surface ocean is projected to decrease by up to 0.35 units. This CO₂ draw down has a direct effect on dissolved inorganic carbon (DIC) balance in the ocean. OA is expected to impact calcifying organisms that rely on constituencies of the DIC system, specifically carbonate ion [CO₃^2-]. It is clear that externally calcified structures, such as coral skeletons, bivalve shells, etc., will be significantly affected as pH, and consequently [CO₃2− ], of the oceans decline. What is unclear, however, is how these changes will impact internally calcified structures, such as earstones (otoliths) of teleost fish. This dissertation examines the impacts of OA on otolith mineralization in larval reef fish (Amphiprion clarkiiand A. frenatus ). This research included the development of a laboratory controller system for control of experimental aquaria pH through pCO₂ dosing, exposure of larvae from hatch to settlement under various pCO2 treatments and evaluation of otolith structure and morphology across treatments within a single genus. No standard method for pH-stat CO₂ dosing controllers existed prior to this study. Incorporating low-cost, flexible hardware allowed high precision and accuracy pH controllers to be designed and implemented. Following system stability studies, we found that our system performed at or beyond the level of control exhibited in the literature. Two species of clownfish, Amphiprion clarkii and A. frenatus, were exposed to different pCO₂ conditions, reared to settlement and otoliths extracted and studied. I found that the sagittae (largest of the 3 otolith types) of both species exhibited circularity changes towards more oblong otoliths under increased pCO₂. For A. clarkii, I found a significant negative relation between pCO₂ and lapilli otolith circularity, indicating a shift toward more circular lapilli under increased pCO₂. Since lapilli are critical to gravisensing in teleosts these results explain my anecdotal observations that, at high pCO₂, larvae exhibited lethargic, uncoordinated swim patterns. The core development of otoliths (sagittae, lapilli, and asterisci) from both species was analyzed using SEM imagery. Otolith images were scored by 6 independent readers for core development (poorly developed to well-developed). Otolith scores were regressed against aragonite saturation state (Ω_Ar). Results showed significant and strong relations between ΩAr and development score, indicating a shift toward protruding, unorganized crystal clusters within the core under high pH/low Ω_Ar. This research is the first to comprehensively examine the impact of OA on the otolith system in larval fish.…

Subjects/Keywords: Chemical Oceanography; Mineralogy; Environmental Sciences

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APA (6^th Edition):

Wilcox Freeburg, E. D. (2014). Exploring the link between otolith growth and function along the biological continuum in the context of ocean acidification. (Thesis). University of Massachusetts Boston. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3622214

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):

Wilcox Freeburg, Eric D. “Exploring the link between otolith growth and function along the biological continuum in the context of ocean acidification.” 2014. Thesis, University of Massachusetts Boston. Accessed March 05, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=3622214.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wilcox Freeburg, Eric D. “Exploring the link between otolith growth and function along the biological continuum in the context of ocean acidification.” 2014. Web. 05 Mar 2021.

Vancouver:

Wilcox Freeburg ED. Exploring the link between otolith growth and function along the biological continuum in the context of ocean acidification. [Internet] [Thesis]. University of Massachusetts Boston; 2014. [cited 2021 Mar 05]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3622214.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wilcox Freeburg ED. Exploring the link between otolith growth and function along the biological continuum in the context of ocean acidification. [Thesis]. University of Massachusetts Boston; 2014. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3622214

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Oregon State University

25. Lilley, Marvin Douglas. Studies on the marine chemistry of reduced trace gases.

Degree: PhD, Oceanography, 1983, Oregon State University

URL: http://hdl.handle.net/1957/28066

Subjects/Keywords: Chemical oceanography

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APA (6^th Edition):

Lilley, M. D. (1983). Studies on the marine chemistry of reduced trace gases. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/28066

Chicago Manual of Style (16^th Edition):

Lilley, Marvin Douglas. “Studies on the marine chemistry of reduced trace gases.” 1983. Doctoral Dissertation, Oregon State University. Accessed March 05, 2021. http://hdl.handle.net/1957/28066.

MLA Handbook (7^th Edition):

Lilley, Marvin Douglas. “Studies on the marine chemistry of reduced trace gases.” 1983. Web. 05 Mar 2021.

Vancouver:

Lilley MD. Studies on the marine chemistry of reduced trace gases. [Internet] [Doctoral dissertation]. Oregon State University; 1983. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/1957/28066.

Council of Science Editors:

Lilley MD. Studies on the marine chemistry of reduced trace gases. [Doctoral Dissertation]. Oregon State University; 1983. Available from: http://hdl.handle.net/1957/28066

Oregon State University

26. De Angelis, Marie Agatha. Nitrous oxide studies in two marine environments : an unpolluted estuary and the interstitial water of a deep-sea sediment.

Degree: MS, Oceanography, 1980, Oregon State University

URL: http://hdl.handle.net/1957/27933

Subjects/Keywords: Chemical oceanography

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APA (6^th Edition):

De Angelis, M. A. (1980). Nitrous oxide studies in two marine environments : an unpolluted estuary and the interstitial water of a deep-sea sediment. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/27933

Chicago Manual of Style (16^th Edition):

De Angelis, Marie Agatha. “Nitrous oxide studies in two marine environments : an unpolluted estuary and the interstitial water of a deep-sea sediment.” 1980. Masters Thesis, Oregon State University. Accessed March 05, 2021. http://hdl.handle.net/1957/27933.

MLA Handbook (7^th Edition):

De Angelis, Marie Agatha. “Nitrous oxide studies in two marine environments : an unpolluted estuary and the interstitial water of a deep-sea sediment.” 1980. Web. 05 Mar 2021.

Vancouver:

De Angelis MA. Nitrous oxide studies in two marine environments : an unpolluted estuary and the interstitial water of a deep-sea sediment. [Internet] [Masters thesis]. Oregon State University; 1980. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/1957/27933.

Council of Science Editors:

De Angelis MA. Nitrous oxide studies in two marine environments : an unpolluted estuary and the interstitial water of a deep-sea sediment. [Masters Thesis]. Oregon State University; 1980. Available from: http://hdl.handle.net/1957/27933

Oregon State University

27. Dahm, Clifford N. A study of nutrient dynamics in the Atlantic Ocean.

Degree: MA, Oceanography, 1974, Oregon State University

URL: http://hdl.handle.net/1957/28435

► During the GEOSECS cruise of the R/V KNORR, July 1972-April 1973, a very complete and high quality nutrient data set was acquired for the Atlantic… (more)

▼ During the GEOSECS cruise of the R/V KNORR, July 1972-April 1973, a very complete and high quality nutrient data set was acquired for the Atlantic Ocean. One hundred and twenty-one hydrographic stations were occupied throughout the Atlantic providing an internally consistent picture of the nutrient dynamics for this ocean. The dynamic and biological controls on the nutrient distribution were viewed by means of horizontal distribution patterns, vertical profiling, and statistical modeling of relationships between oxygen, potential temperature, salinity, and nutrients. The general conclusions are summarized as follows: 1. The nutrient concentrations in the Atlantic exhibit the interplay at all depths of nutrient rich waters of South Atlantic origin with nutrient poor waters of the North Atlantic. This interrelationship of the two water sources manifests itself in numerous extrema (maxima and minima) in the water column. 2. For intermediate and deep waters, the strong predominance of lateral transport over processes of vertical dissipation are apparent in the Atlantic. Identifiable water types with only small variations of potential temperature (θ), salinity (S), and preformed nutrients can be characterized thousands of miles from their region of origin. 3. Silicate distribution in the Atlantic exhibits very marked gradients between waters of South and North Atlantic origin. Variations of up to 100 μm/kg occur where salinity differences are less than 0.3‰. Great potential exists for the use of silicate as a water mass tracer for Antarctic Intermediate Water (AAIW), North Atlantic Deep Water (NADW), and Antarctic Bottom Water (AABW). 4. The deep and bottom water nutrient distribution can be explained purely from hydrodynamic considerations. Nutrients, dissolved oxygen (O₂), and apparent oxygen utilization (AOU) behave like conservative parameters. The rates of oxidation in deep water are slow relative to the physical processes of mixing and advection, 5. The total organic carbon (TOG) is relatively invariant below a few hundred meters. Significant variation at the cores of NADW, AAIW, and at the ocean bottom is indistinguishable at the present analytical capability. This supports the observation of very low rates of oxidation in the abyssal waters of the Atlantic. 6. The use of statistical models of O₂ as a function of θ or S and a nutrient are consistent with θ-S diagrams in distinguishing the influence of various water types. In addition, a subsurface water type is seen in temperate and equatorial regions which is due to biochemical activity. This water type corresponds to the portion of the water column where rapid oxidation of organic carbon ceases. It is characterized by a low preformed nutrient concentration but a relatively high oxidative nutrient portion. 7. Statistical modeling for a series of stations in the Drake Passage shows the extent of biological depletion across the Passage and points out the influence of an oxygen rich bottom water in the southern reaches of… Advisors/Committee Members: Park, P. Kilho (advisor).

Subjects/Keywords: Chemical oceanography

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APA (6^th Edition):

Dahm, C. N. (1974). A study of nutrient dynamics in the Atlantic Ocean. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/28435

Chicago Manual of Style (16^th Edition):

Dahm, Clifford N. “A study of nutrient dynamics in the Atlantic Ocean.” 1974. Masters Thesis, Oregon State University. Accessed March 05, 2021. http://hdl.handle.net/1957/28435.

MLA Handbook (7^th Edition):

Dahm, Clifford N. “A study of nutrient dynamics in the Atlantic Ocean.” 1974. Web. 05 Mar 2021.

Vancouver:

Dahm CN. A study of nutrient dynamics in the Atlantic Ocean. [Internet] [Masters thesis]. Oregon State University; 1974. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/1957/28435.

Council of Science Editors:

Dahm CN. A study of nutrient dynamics in the Atlantic Ocean. [Masters Thesis]. Oregon State University; 1974. Available from: http://hdl.handle.net/1957/28435

Oregon State University

28. Marmorino, G. O. Equilibrium heat and salt transport through a diffusive, thermohaline interface.

Degree: MS, Oceanography, 1974, Oregon State University

URL: http://hdl.handle.net/1957/28748

► An experimental investigation of the thermohaline, diffusive interface between convecting layers, with heat fluxes more similar to natural fluxes than in previous studies, shows that… (more)

Subjects/Keywords: Chemical oceanography

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):

Marmorino, G. O. (1974). Equilibrium heat and salt transport through a diffusive, thermohaline interface. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/28748

Chicago Manual of Style (16^th Edition):

Marmorino, G O. “Equilibrium heat and salt transport through a diffusive, thermohaline interface.” 1974. Masters Thesis, Oregon State University. Accessed March 05, 2021. http://hdl.handle.net/1957/28748.

MLA Handbook (7^th Edition):

Marmorino, G O. “Equilibrium heat and salt transport through a diffusive, thermohaline interface.” 1974. Web. 05 Mar 2021.

Vancouver:

Marmorino GO. Equilibrium heat and salt transport through a diffusive, thermohaline interface. [Internet] [Masters thesis]. Oregon State University; 1974. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/1957/28748.

Council of Science Editors:

Marmorino GO. Equilibrium heat and salt transport through a diffusive, thermohaline interface. [Masters Thesis]. Oregon State University; 1974. Available from: http://hdl.handle.net/1957/28748

29. Singer, Jared Wesley. Formation and Transformation of Amorphous Calcium-Magnesium Carbonates in Synthetic Seawater.

Degree: 2018, Alfred University

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10184519

► The aqueous chemistry, precipitation, and crystallization of metal-carbonates comprises a vast field of research that underlies the urgency of CO₂ sequestration, ocean-acidification, and biomineralization.… (more)

▼ The aqueous chemistry, precipitation, and crystallization of metal-carbonates comprises a vast field of research that underlies the urgency of CO₂ sequestration, ocean-acidification, and biomineralization. The results of recent experimental and computational studies suggest that amorphous calcium and magnesium carbonates are precipitated from supersaturated aqueous conditions by non-classical aggregation of ion pairs, dimers, dynamically-ordered-liquid-likeoxypolymers (DOLLOPS), and prenucleation clusters (PNCs). We present the first high field (20 T) ⁴³Ca and ²⁵Mg NMR studies of amorphous calcium-magnesium carbonates (ACC, ACMC, AMC) materials. Direct integration of computational techniques with experimental NMR provides a novel step forward toward multi-scale integration of computational and experimental techniques. Supporting information is derived from X-ray diffraction (XRD), thermogravimetric/differential thermal analysis (TGA-DTA), and scanning electron microscopy—energy dispersive spectroscopy (SEM-EDS) and provides important comparison to the bulk structures and composition. High field NMR of amorphous carbonates demonstrates that amorphous carbonates contain various types of local disorder, but does not corroborate the theory of polyamorphism nor nano scale phase separations postulated by other workers. Carbon (¹³C) NMR of ¹³Cenriched materials indicates a degree of Ca-Mg solid solution in ACMCs, as ACMC ¹³C resonances cannot be adequately reconstructed from the pure ACC and AMC ¹³C resonances. However, with increasing Mg-content (and therefore H₂O content) ¹³C NMR resonances are strongly influenced by water-carbonate hydrogen bonding, shifting to lower resonance frequency and broadening. The ¹³C-NMR are well-fit with single Gaussian distributions, suggesting that two-phase models of ACMCs are not required to explain our ¹³C NMR observations. Protoncarbon cross polarization indicates that there is a H population proximal to carbonate groups for all amorphous phases. ⁴³Ca NMR yields line shapes that span the resonance frequency range of all known crystalline calcium carbonate polymorphs and is well fit with a single Gaussian distributions. ⁴³Ca NMR does not support a theory of polyamorphisms, but rather suggests an unstructured, continuous distribution of local environments that is unlike any specific crystalline phase. The mean ⁴³Ca chemical shifts vary 0.77 ppm from compositions x = 0 to 0.5 [x = Mg/(Mg + Ca)], demonstrating that Mg²⁺ has very little influence on the molecular-scale ⁴³Ca environment in ACMCs. Through integration of quantum mechanical calculations, classical MD, and NMR we ascertain a maximum mean Ca-O bond distance in our ACCs/ACMCs of 2.45 ± 1 Å that is independent of composition. Unlike the indistinguishable local calcium environments, ²⁵Mg NMR of amorphous material…

Subjects/Keywords: Chemical oceanography; Chemistry; Materials science

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

APA (6^th Edition):

Singer, J. W. (2018). Formation and Transformation of Amorphous Calcium-Magnesium Carbonates in Synthetic Seawater. (Thesis). Alfred University. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10184519

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):

Singer, Jared Wesley. “Formation and Transformation of Amorphous Calcium-Magnesium Carbonates in Synthetic Seawater.” 2018. Thesis, Alfred University. Accessed March 05, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=10184519.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Singer, Jared Wesley. “Formation and Transformation of Amorphous Calcium-Magnesium Carbonates in Synthetic Seawater.” 2018. Web. 05 Mar 2021.

Vancouver:

Singer JW. Formation and Transformation of Amorphous Calcium-Magnesium Carbonates in Synthetic Seawater. [Internet] [Thesis]. Alfred University; 2018. [cited 2021 Mar 05]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10184519.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Singer JW. Formation and Transformation of Amorphous Calcium-Magnesium Carbonates in Synthetic Seawater. [Thesis]. Alfred University; 2018. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10184519

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

30. Tcaciuc, Alexandra P. Using passive samplers to assess bioavailability, toxicity, and reactivity of hydrophobic organic chemicals (HOCs).

Degree: 2015, MIT and Woods Hole Oceanographic Institution

URL: http://hdl.handle.net/1912/7305

► Hydrophobic organic chemicals (HOCs) are a class of environmental contaminants responsible for numerous acute and chronic health effects in humans and wildlife. This thesis illustrates… (more)

▼ Hydrophobic organic chemicals (HOCs) are a class of environmental contaminants responsible for numerous acute and chronic health effects in humans and wildlife. This thesis illustrates three applications of polyethylene (PE) passive sampling, which enhance our toolbox for estimating environmental hazards associated with HOCs. First, we present a methodology that can be used to estimate the bioaccumulation potential of numerous organic chemicals based on passive sampling and comprehensive two dimensional gas chromatography (GC × GC). Using GC × GC retention times, we show that lipid-water and samplerwater partition coefficients can be estimated within a factor of 2 and 3, respectively. The method was then applied to estimate body burdens of various HOCs in benthic organisms from GC × GC analysis of PE equilibrated with contaminated sediment. Empirical observations of accumulation in the Nereis virens polychaete were in good agreement with PE-based predictions for PCBs, but were lower by at least an order of magnitude for other classes of HOCs (such as PAHs) presumably due to metabolism. Second, we applied the same methodology to a set of contaminated sediments and estimated the cumulative baseline toxicity associated with environmental mixtures of HOCs. The predictions were compared against empirical measurements of baseline toxicity using the water flea Daphnia magna. The estimated total body burdens of HOCs were in good agreement with measured toxicity, with toxicity occurring at body burdens larger than 30 mg/glipid. In contrast, the toxicity estimated based on priority pollutants severely underestimated the observed toxicity, emphasizing the importance of cumulative effects. Lastly, to advance our understanding of the processes that affect passive sampling results in situ (when they are operating away from equilibrium), a mathematical model was developed for reactive chemicals transferring between PE and sediment beds. The reaction diffusion model was used to infer in situ degradation rates of dichlorodiphenyltrichloroethane (DDT), which in the sediments of a freshwater lake were found to be between 0.09 and 0.9 d-1. A second mathematical model describing the kinetics of exchange between passive samplers and water was also developed, which can be used in both field (infinite baths) and laboratory (finite baths) conditions.

Subjects/Keywords: Marine pollution; Chemical oceanography

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

APA (6^th Edition):

Tcaciuc, A. P. (2015). Using passive samplers to assess bioavailability, toxicity, and reactivity of hydrophobic organic chemicals (HOCs). (Thesis). MIT and Woods Hole Oceanographic Institution. Retrieved from http://hdl.handle.net/1912/7305

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):

Tcaciuc, Alexandra P. “Using passive samplers to assess bioavailability, toxicity, and reactivity of hydrophobic organic chemicals (HOCs).” 2015. Thesis, MIT and Woods Hole Oceanographic Institution. Accessed March 05, 2021. http://hdl.handle.net/1912/7305.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tcaciuc, Alexandra P. “Using passive samplers to assess bioavailability, toxicity, and reactivity of hydrophobic organic chemicals (HOCs).” 2015. Web. 05 Mar 2021.

Vancouver:

Tcaciuc AP. Using passive samplers to assess bioavailability, toxicity, and reactivity of hydrophobic organic chemicals (HOCs). [Internet] [Thesis]. MIT and Woods Hole Oceanographic Institution; 2015. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/1912/7305.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tcaciuc AP. Using passive samplers to assess bioavailability, toxicity, and reactivity of hydrophobic organic chemicals (HOCs). [Thesis]. MIT and Woods Hole Oceanographic Institution; 2015. Available from: http://hdl.handle.net/1912/7305

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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