Climate transitions across the cenozoic: insight from elemental ratios in benthic foraminifera and marine gastropods
The Cenozoic climate record derived from the oxygen isotope ratios of benthic foraminifera (δ18Ob) displays several, short term steps signifying the glaciation of Antarctica (~33.7 Ma) and the development (~2.7 Ma) and intensification (~0.9 Ma) of large-scale northern hemisphere glaciation (NHG), te...
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ftrutgersuniv:oai:example.org:rutgers-lib:24890 2023-05-15T13:31:14+02:00 Climate transitions across the cenozoic: insight from elemental ratios in benthic foraminifera and marine gastropods Sosdian, Sindia Maria Sosdian, Sindia Maria (author) Rosenthal, Yair (chair) Miller, Ken (internal member) Wright, Jim (internal member) Broccoli, Anthony (internal member) Raymo, Maureen (outside member) Rutgers University Graduate School - New Brunswick 2008 xxiii, 232 pages electronic application/pdf http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.17576 English eng Graduate School - New Brunswick Electronic Theses and Dissertations rucore19991600001 http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.17576 Oceanography Paleoclimatology--Cenozoic Climatic changes Text theses 2008 ftrutgersuniv 2022-05-30T13:37:21Z The Cenozoic climate record derived from the oxygen isotope ratios of benthic foraminifera (δ18Ob) displays several, short term steps signifying the glaciation of Antarctica (~33.7 Ma) and the development (~2.7 Ma) and intensification (~0.9 Ma) of large-scale northern hemisphere glaciation (NHG), termed hereafter the late Pliocene transition (LPT) and mid-Pleistocene transition (MPT), respectively. The interpretation of the δ18Ob record, which is controlled by both temperature and the oxygen isotopic composition of seawater (δω), is, however, not straightforward. In the work presented here, I:(1) used Mg/Ca benthic foraminiferal paleothermometry paired with δ18Ob to construct high resolution records of deep ocean temperature and global ice volume to understand the underlying mechanisms of Pliocene-Pleistocene climate transitions and (2) developed a new salinity independent paleothermometer based on Sr/Ca ratios in marine gastropods and examined its potential for Cenozoic low-latitude sea surface temperature reconstructions and I constructed and applied a new regional Mg/Ca-temperature calibration based on downcore Mg/Ca variations to encompass changes in temperature and carbonate saturation in deep Atlantic Ocean. The new, high resolution bottom water temperature record from North Atlantic Deep Sea Drilling Project site 607 indicates that the deep ocean cooled across both the LPT and MPT. The cooling across the MPT preconditioned the high latitudes for ice-sheet growth by modifying heat transport through changes in meridional temperature gradients. Across the LPT, the mean trend in sea level decreased by 20+/-25m whereas the MPT is associated with an increase in glacial-interglacial amplitude of sea level. I propose that the MPT is related to a change in ice sheet dynamics, specifically growth of thicker ice sheets, and that a threshold response to high-latitude cooling is not sufficient to explain the MPT. The Sr/Ca- temperature calibration study, based on the marine gastropod Conus ermineus, shows that ... Thesis Antarc* Antarctica Ice Sheet North Atlantic RUcore - Rutgers University Community Repository |
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Open Polar |
collection |
RUcore - Rutgers University Community Repository |
op_collection_id |
ftrutgersuniv |
language |
English |
topic |
Oceanography Paleoclimatology--Cenozoic Climatic changes |
spellingShingle |
Oceanography Paleoclimatology--Cenozoic Climatic changes Sosdian, Sindia Maria Climate transitions across the cenozoic: insight from elemental ratios in benthic foraminifera and marine gastropods |
topic_facet |
Oceanography Paleoclimatology--Cenozoic Climatic changes |
description |
The Cenozoic climate record derived from the oxygen isotope ratios of benthic foraminifera (δ18Ob) displays several, short term steps signifying the glaciation of Antarctica (~33.7 Ma) and the development (~2.7 Ma) and intensification (~0.9 Ma) of large-scale northern hemisphere glaciation (NHG), termed hereafter the late Pliocene transition (LPT) and mid-Pleistocene transition (MPT), respectively. The interpretation of the δ18Ob record, which is controlled by both temperature and the oxygen isotopic composition of seawater (δω), is, however, not straightforward. In the work presented here, I:(1) used Mg/Ca benthic foraminiferal paleothermometry paired with δ18Ob to construct high resolution records of deep ocean temperature and global ice volume to understand the underlying mechanisms of Pliocene-Pleistocene climate transitions and (2) developed a new salinity independent paleothermometer based on Sr/Ca ratios in marine gastropods and examined its potential for Cenozoic low-latitude sea surface temperature reconstructions and I constructed and applied a new regional Mg/Ca-temperature calibration based on downcore Mg/Ca variations to encompass changes in temperature and carbonate saturation in deep Atlantic Ocean. The new, high resolution bottom water temperature record from North Atlantic Deep Sea Drilling Project site 607 indicates that the deep ocean cooled across both the LPT and MPT. The cooling across the MPT preconditioned the high latitudes for ice-sheet growth by modifying heat transport through changes in meridional temperature gradients. Across the LPT, the mean trend in sea level decreased by 20+/-25m whereas the MPT is associated with an increase in glacial-interglacial amplitude of sea level. I propose that the MPT is related to a change in ice sheet dynamics, specifically growth of thicker ice sheets, and that a threshold response to high-latitude cooling is not sufficient to explain the MPT. The Sr/Ca- temperature calibration study, based on the marine gastropod Conus ermineus, shows that ... |
author2 |
Sosdian, Sindia Maria (author) Rosenthal, Yair (chair) Miller, Ken (internal member) Wright, Jim (internal member) Broccoli, Anthony (internal member) Raymo, Maureen (outside member) Rutgers University Graduate School - New Brunswick |
format |
Thesis |
author |
Sosdian, Sindia Maria |
author_facet |
Sosdian, Sindia Maria |
author_sort |
Sosdian, Sindia Maria |
title |
Climate transitions across the cenozoic: insight from elemental ratios in benthic foraminifera and marine gastropods |
title_short |
Climate transitions across the cenozoic: insight from elemental ratios in benthic foraminifera and marine gastropods |
title_full |
Climate transitions across the cenozoic: insight from elemental ratios in benthic foraminifera and marine gastropods |
title_fullStr |
Climate transitions across the cenozoic: insight from elemental ratios in benthic foraminifera and marine gastropods |
title_full_unstemmed |
Climate transitions across the cenozoic: insight from elemental ratios in benthic foraminifera and marine gastropods |
title_sort |
climate transitions across the cenozoic: insight from elemental ratios in benthic foraminifera and marine gastropods |
publishDate |
2008 |
url |
http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.17576 |
genre |
Antarc* Antarctica Ice Sheet North Atlantic |
genre_facet |
Antarc* Antarctica Ice Sheet North Atlantic |
op_relation |
Graduate School - New Brunswick Electronic Theses and Dissertations rucore19991600001 http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.17576 |
_version_ |
1766016859506737152 |