Proxy Development and Application for Reconstructing the Surface Ocean Carbonate System
Over the last two centuries, human activities have led to an unprecedented rate of carbon input into the atmosphere and oceans resulting in an alarmingly rapid decline in surface ocean pH, a process referred to as ocean acidification (OA). This process is leading to an observed decline in the carbon...
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ftunivsouthcar:oai:scholarcommons.sc.edu:etd-4188 2024-04-21T08:09:37+00:00 Proxy Development and Application for Reconstructing the Surface Ocean Carbonate System Marshall, Brittney J. 2015-01-01T08:00:00Z application/pdf https://scholarcommons.sc.edu/etd/3181 https://scholarcommons.sc.edu/context/etd/article/4188/viewcontent/Marshall_sc_0202A_13766_1_.pdf English eng Scholar Commons https://scholarcommons.sc.edu/etd/3181 https://scholarcommons.sc.edu/context/etd/article/4188/viewcontent/Marshall_sc_0202A_13766_1_.pdf © 2015, Brittney J. Marshall Theses and Dissertations carbon input decline in surface ocean PH ocean acidification OA Earth Sciences Geology Physical Sciences and Mathematics text 2015 ftunivsouthcar 2024-03-27T15:28:40Z Over the last two centuries, human activities have led to an unprecedented rate of carbon input into the atmosphere and oceans resulting in an alarmingly rapid decline in surface ocean pH, a process referred to as ocean acidification (OA). This process is leading to an observed decline in the carbonate ion concentrations ([CO3 2-]) in seawater – an ion that a large number of marine organisms (e.g. corals, foraminifera) utilize to secrete their skeletons and shells. The ability to identify past ocean acidification events using the marine sedimentary record can shed light on future impacts of the modern OA dilemma. Planktonic foraminifera have the ability to record the physical and chemical properties of the seawater in which they calcified, therefore the fossil shells of foraminifera serve as archives for past climatic and oceanographic conditions. Here, we present a new proxy surface ocean [CO3 2-] – planktonic foraminferal area density – and establish methods for a known proxy for surface ocean pH – the boron isotopic composition of foraminiferal calcite (δ11B). These proxies are used to reconstruct changes in the surface ocean carbonate system of the eastern equatorial Pacific over the last 35, 000 years using marine sediment core TR163-19 collected from the Cocos Ridge (2°16’N, 90°57’W, 2,348 m). The stable carbon and oxygen isotopic compositions of two morphotypes of planktonic foraminifer Orbulina universa collected from the Cariaco Basin, Venezuela are also investigated, with results suggesting that the two morphotypes record different environmental signals in the calcite shells and should not be used together during paleoceanographic reconstructions. Text Ocean acidification Planktonic foraminifera University of South Carolina Libraries: Scholar Commons |
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University of South Carolina Libraries: Scholar Commons |
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ftunivsouthcar |
language |
English |
topic |
carbon input decline in surface ocean PH ocean acidification OA Earth Sciences Geology Physical Sciences and Mathematics |
spellingShingle |
carbon input decline in surface ocean PH ocean acidification OA Earth Sciences Geology Physical Sciences and Mathematics Marshall, Brittney J. Proxy Development and Application for Reconstructing the Surface Ocean Carbonate System |
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carbon input decline in surface ocean PH ocean acidification OA Earth Sciences Geology Physical Sciences and Mathematics |
description |
Over the last two centuries, human activities have led to an unprecedented rate of carbon input into the atmosphere and oceans resulting in an alarmingly rapid decline in surface ocean pH, a process referred to as ocean acidification (OA). This process is leading to an observed decline in the carbonate ion concentrations ([CO3 2-]) in seawater – an ion that a large number of marine organisms (e.g. corals, foraminifera) utilize to secrete their skeletons and shells. The ability to identify past ocean acidification events using the marine sedimentary record can shed light on future impacts of the modern OA dilemma. Planktonic foraminifera have the ability to record the physical and chemical properties of the seawater in which they calcified, therefore the fossil shells of foraminifera serve as archives for past climatic and oceanographic conditions. Here, we present a new proxy surface ocean [CO3 2-] – planktonic foraminferal area density – and establish methods for a known proxy for surface ocean pH – the boron isotopic composition of foraminiferal calcite (δ11B). These proxies are used to reconstruct changes in the surface ocean carbonate system of the eastern equatorial Pacific over the last 35, 000 years using marine sediment core TR163-19 collected from the Cocos Ridge (2°16’N, 90°57’W, 2,348 m). The stable carbon and oxygen isotopic compositions of two morphotypes of planktonic foraminifer Orbulina universa collected from the Cariaco Basin, Venezuela are also investigated, with results suggesting that the two morphotypes record different environmental signals in the calcite shells and should not be used together during paleoceanographic reconstructions. |
format |
Text |
author |
Marshall, Brittney J. |
author_facet |
Marshall, Brittney J. |
author_sort |
Marshall, Brittney J. |
title |
Proxy Development and Application for Reconstructing the Surface Ocean Carbonate System |
title_short |
Proxy Development and Application for Reconstructing the Surface Ocean Carbonate System |
title_full |
Proxy Development and Application for Reconstructing the Surface Ocean Carbonate System |
title_fullStr |
Proxy Development and Application for Reconstructing the Surface Ocean Carbonate System |
title_full_unstemmed |
Proxy Development and Application for Reconstructing the Surface Ocean Carbonate System |
title_sort |
proxy development and application for reconstructing the surface ocean carbonate system |
publisher |
Scholar Commons |
publishDate |
2015 |
url |
https://scholarcommons.sc.edu/etd/3181 https://scholarcommons.sc.edu/context/etd/article/4188/viewcontent/Marshall_sc_0202A_13766_1_.pdf |
genre |
Ocean acidification Planktonic foraminifera |
genre_facet |
Ocean acidification Planktonic foraminifera |
op_source |
Theses and Dissertations |
op_relation |
https://scholarcommons.sc.edu/etd/3181 https://scholarcommons.sc.edu/context/etd/article/4188/viewcontent/Marshall_sc_0202A_13766_1_.pdf |
op_rights |
© 2015, Brittney J. Marshall |
_version_ |
1796950754582331392 |