A history of sea ice in the Cenozoic Arctic Ocean
The body of this work focuses on the use and revelations of grain size distributions combined with age models and physical properties of sediments, expanding our understanding of the central Arctic Ocean in the Cenozoic Era. The Integrated Ocean Drilling Program's (IODP) Expedition 302, Arctic...
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ftunivrhodeislan:oai:digitalcommons.uri.edu:dissertations-2959 2023-05-15T14:03:08+02:00 A history of sea ice in the Cenozoic Arctic Ocean Ashmankas, Cristin Elizabeth 2013-01-01T08:00:00Z https://digitalcommons.uri.edu/dissertations/AAI1536100 ENG eng DigitalCommons@URI https://digitalcommons.uri.edu/dissertations/AAI1536100 Dissertations and Master's Theses (Campus Access) Climate Change|Physical oceanography|Sedimentary Geology|Paleoclimate Science text 2013 ftunivrhodeislan 2021-06-29T19:21:00Z The body of this work focuses on the use and revelations of grain size distributions combined with age models and physical properties of sediments, expanding our understanding of the central Arctic Ocean in the Cenozoic Era. The Integrated Ocean Drilling Program's (IODP) Expedition 302, Arctic Coring Expedition (ACEX), recovered sediment cores from the Lomonosov Ridge, providing the most extensive geologic record of the region ever recovered. This record provides the first opportunity for scientists to directly determine the paleo—ice history of the region, one of high importance to understanding global climate. Grain size distribution analyses reveal a more consistent ice presence than previously believed possible for the region. The implication suggests a simultaneous transition to a strong cryo-state occurring at both poles. This differs from the previous paradigm of the Antarctic's cryo-state strengthening millennia earlier than the Arctic. A simultaneous transition to a stronger cryo-state implies a global climatic driver, disavowing theories of current and continental shifts driving one pole than the other. Due to the premiere opportunity to study the cryo-state of the central Arctic Ocean over a significant portion of the Cenozoic, proxies and analysis techniques needed to be developed and updated. A series of proxies for determining the type and intensity of the cryo-state are presented and employed in paleo-analyses. In addition, predictive relationships between grain size distributions and the physical properties of the sediments developed for these glacio-marine sediments allows more extensive analysis that can be used in the future to determine regions of interest non-destructively to the cores. This will be of significant benefit to future expeditions to the region. Finally, the use of grain size to determine and remove the effects of paleo-currents was updated for the unique depositional environment. Interconnecting other elements of the global climate system to the central Arctic's cryo-state demonstrates the true interconnectedness of the global system. Text Antarc* Arctic Arctic Ocean Climate change Lomonosov Ridge Sea ice University of Rhode Island: DigitalCommons@URI Arctic Arctic Ocean |
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Open Polar |
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University of Rhode Island: DigitalCommons@URI |
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ftunivrhodeislan |
language |
English |
topic |
Climate Change|Physical oceanography|Sedimentary Geology|Paleoclimate Science |
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Climate Change|Physical oceanography|Sedimentary Geology|Paleoclimate Science Ashmankas, Cristin Elizabeth A history of sea ice in the Cenozoic Arctic Ocean |
topic_facet |
Climate Change|Physical oceanography|Sedimentary Geology|Paleoclimate Science |
description |
The body of this work focuses on the use and revelations of grain size distributions combined with age models and physical properties of sediments, expanding our understanding of the central Arctic Ocean in the Cenozoic Era. The Integrated Ocean Drilling Program's (IODP) Expedition 302, Arctic Coring Expedition (ACEX), recovered sediment cores from the Lomonosov Ridge, providing the most extensive geologic record of the region ever recovered. This record provides the first opportunity for scientists to directly determine the paleo—ice history of the region, one of high importance to understanding global climate. Grain size distribution analyses reveal a more consistent ice presence than previously believed possible for the region. The implication suggests a simultaneous transition to a strong cryo-state occurring at both poles. This differs from the previous paradigm of the Antarctic's cryo-state strengthening millennia earlier than the Arctic. A simultaneous transition to a stronger cryo-state implies a global climatic driver, disavowing theories of current and continental shifts driving one pole than the other. Due to the premiere opportunity to study the cryo-state of the central Arctic Ocean over a significant portion of the Cenozoic, proxies and analysis techniques needed to be developed and updated. A series of proxies for determining the type and intensity of the cryo-state are presented and employed in paleo-analyses. In addition, predictive relationships between grain size distributions and the physical properties of the sediments developed for these glacio-marine sediments allows more extensive analysis that can be used in the future to determine regions of interest non-destructively to the cores. This will be of significant benefit to future expeditions to the region. Finally, the use of grain size to determine and remove the effects of paleo-currents was updated for the unique depositional environment. Interconnecting other elements of the global climate system to the central Arctic's cryo-state demonstrates the true interconnectedness of the global system. |
format |
Text |
author |
Ashmankas, Cristin Elizabeth |
author_facet |
Ashmankas, Cristin Elizabeth |
author_sort |
Ashmankas, Cristin Elizabeth |
title |
A history of sea ice in the Cenozoic Arctic Ocean |
title_short |
A history of sea ice in the Cenozoic Arctic Ocean |
title_full |
A history of sea ice in the Cenozoic Arctic Ocean |
title_fullStr |
A history of sea ice in the Cenozoic Arctic Ocean |
title_full_unstemmed |
A history of sea ice in the Cenozoic Arctic Ocean |
title_sort |
history of sea ice in the cenozoic arctic ocean |
publisher |
DigitalCommons@URI |
publishDate |
2013 |
url |
https://digitalcommons.uri.edu/dissertations/AAI1536100 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Antarc* Arctic Arctic Ocean Climate change Lomonosov Ridge Sea ice |
genre_facet |
Antarc* Arctic Arctic Ocean Climate change Lomonosov Ridge Sea ice |
op_source |
Dissertations and Master's Theses (Campus Access) |
op_relation |
https://digitalcommons.uri.edu/dissertations/AAI1536100 |
_version_ |
1766273673802547200 |