A new sea-level record for the Neogene/Quaternary boundary reveals transition to a more stable East Antarctic Ice Sheet
Sea-level rise resulting from the instability of polar continental ice sheets represents a major socioeconomic hazard arising from anthropogenic warming, but the response of the largest component of Earth’s cryosphere, the East Antarctic Ice Sheet (EAIS), to global warming is poorly understood. Here...
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ftpubmed:oai:pubmedcentral.nih.gov:7733790 2023-05-15T13:31:32+02:00 A new sea-level record for the Neogene/Quaternary boundary reveals transition to a more stable East Antarctic Ice Sheet Jakob, Kim A. Wilson, Paul A. Pross, Jörg Ezard, Thomas H. G. Fiebig, Jens Repschläger, Janne Friedrich, Oliver 2020-12-08 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7733790/ http://www.ncbi.nlm.nih.gov/pubmed/33229561 https://doi.org/10.1073/pnas.2004209117 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7733790/ http://www.ncbi.nlm.nih.gov/pubmed/33229561 http://dx.doi.org/10.1073/pnas.2004209117 https://www.pnas.org/site/aboutpnas/licenses.xhtmlPublished under the PNAS license (https://www.pnas.org/site/aboutpnas/licenses.xhtml) . Proc Natl Acad Sci U S A Physical Sciences Text 2020 ftpubmed https://doi.org/10.1073/pnas.2004209117 2021-05-30T00:20:59Z Sea-level rise resulting from the instability of polar continental ice sheets represents a major socioeconomic hazard arising from anthropogenic warming, but the response of the largest component of Earth’s cryosphere, the East Antarctic Ice Sheet (EAIS), to global warming is poorly understood. Here we present a detailed record of North Atlantic deep-ocean temperature, global sea-level, and ice-volume change for ∼2.75 to 2.4 Ma ago, when atmospheric partial pressure of carbon dioxide (pCO(2)) ranged from present-day (>400 parts per million volume, ppmv) to preindustrial (<280 ppmv) values. Our data reveal clear glacial–interglacial cycles in global ice volume and sea level largely driven by the growth and decay of ice sheets in the Northern Hemisphere. Yet, sea-level values during Marine Isotope Stage (MIS) 101 (∼2.55 Ma) also signal substantial melting of the EAIS, and peak sea levels during MIS G7 (∼2.75 Ma) and, perhaps, MIS G1 (∼2.63 Ma) are also suggestive of EAIS instability. During the succeeding glacial–interglacial cycles (MIS 100 to 95), sea levels were distinctly lower than before, strongly suggesting a link between greater stability of the EAIS and increased land-ice volumes in the Northern Hemisphere. We propose that lower sea levels driven by ice-sheet growth in the Northern Hemisphere decreased EAIS susceptibility to ocean melting. Our findings have implications for future EAIS vulnerability to a rapidly warming world. Text Antarc* Antarctic Ice Sheet North Atlantic PubMed Central (PMC) Antarctic East Antarctic Ice Sheet Proceedings of the National Academy of Sciences 117 49 30980 30987 |
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PubMed Central (PMC) |
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ftpubmed |
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English |
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Physical Sciences |
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Physical Sciences Jakob, Kim A. Wilson, Paul A. Pross, Jörg Ezard, Thomas H. G. Fiebig, Jens Repschläger, Janne Friedrich, Oliver A new sea-level record for the Neogene/Quaternary boundary reveals transition to a more stable East Antarctic Ice Sheet |
topic_facet |
Physical Sciences |
description |
Sea-level rise resulting from the instability of polar continental ice sheets represents a major socioeconomic hazard arising from anthropogenic warming, but the response of the largest component of Earth’s cryosphere, the East Antarctic Ice Sheet (EAIS), to global warming is poorly understood. Here we present a detailed record of North Atlantic deep-ocean temperature, global sea-level, and ice-volume change for ∼2.75 to 2.4 Ma ago, when atmospheric partial pressure of carbon dioxide (pCO(2)) ranged from present-day (>400 parts per million volume, ppmv) to preindustrial (<280 ppmv) values. Our data reveal clear glacial–interglacial cycles in global ice volume and sea level largely driven by the growth and decay of ice sheets in the Northern Hemisphere. Yet, sea-level values during Marine Isotope Stage (MIS) 101 (∼2.55 Ma) also signal substantial melting of the EAIS, and peak sea levels during MIS G7 (∼2.75 Ma) and, perhaps, MIS G1 (∼2.63 Ma) are also suggestive of EAIS instability. During the succeeding glacial–interglacial cycles (MIS 100 to 95), sea levels were distinctly lower than before, strongly suggesting a link between greater stability of the EAIS and increased land-ice volumes in the Northern Hemisphere. We propose that lower sea levels driven by ice-sheet growth in the Northern Hemisphere decreased EAIS susceptibility to ocean melting. Our findings have implications for future EAIS vulnerability to a rapidly warming world. |
format |
Text |
author |
Jakob, Kim A. Wilson, Paul A. Pross, Jörg Ezard, Thomas H. G. Fiebig, Jens Repschläger, Janne Friedrich, Oliver |
author_facet |
Jakob, Kim A. Wilson, Paul A. Pross, Jörg Ezard, Thomas H. G. Fiebig, Jens Repschläger, Janne Friedrich, Oliver |
author_sort |
Jakob, Kim A. |
title |
A new sea-level record for the Neogene/Quaternary boundary reveals transition to a more stable East Antarctic Ice Sheet |
title_short |
A new sea-level record for the Neogene/Quaternary boundary reveals transition to a more stable East Antarctic Ice Sheet |
title_full |
A new sea-level record for the Neogene/Quaternary boundary reveals transition to a more stable East Antarctic Ice Sheet |
title_fullStr |
A new sea-level record for the Neogene/Quaternary boundary reveals transition to a more stable East Antarctic Ice Sheet |
title_full_unstemmed |
A new sea-level record for the Neogene/Quaternary boundary reveals transition to a more stable East Antarctic Ice Sheet |
title_sort |
new sea-level record for the neogene/quaternary boundary reveals transition to a more stable east antarctic ice sheet |
publisher |
National Academy of Sciences |
publishDate |
2020 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7733790/ http://www.ncbi.nlm.nih.gov/pubmed/33229561 https://doi.org/10.1073/pnas.2004209117 |
geographic |
Antarctic East Antarctic Ice Sheet |
geographic_facet |
Antarctic East Antarctic Ice Sheet |
genre |
Antarc* Antarctic Ice Sheet North Atlantic |
genre_facet |
Antarc* Antarctic Ice Sheet North Atlantic |
op_source |
Proc Natl Acad Sci U S A |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7733790/ http://www.ncbi.nlm.nih.gov/pubmed/33229561 http://dx.doi.org/10.1073/pnas.2004209117 |
op_rights |
https://www.pnas.org/site/aboutpnas/licenses.xhtmlPublished under the PNAS license (https://www.pnas.org/site/aboutpnas/licenses.xhtml) . |
op_doi |
https://doi.org/10.1073/pnas.2004209117 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
117 |
container_issue |
49 |
container_start_page |
30980 |
op_container_end_page |
30987 |
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1766018691393126400 |