Impact of abrupt sea ice loss on Greenland water isotopes during the last glacial period
Greenland ice cores provide excellent evidence of past abrupt climate changes. However, there is no universally accepted theory of how and why these Dansgaard–Oeschger (DO) events occur. Several mechanisms have been proposed to explain DO events, including sea ice, ice shelf buildup, ice sheets, atm...
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ftpubmed:oai:pubmedcentral.nih.gov:6410777 2023-05-15T16:25:15+02:00 Impact of abrupt sea ice loss on Greenland water isotopes during the last glacial period Sime, Louise C. Hopcroft, Peter O. Rhodes, Rachael H. 2019-03-05 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6410777/ http://www.ncbi.nlm.nih.gov/pubmed/30760586 https://doi.org/10.1073/pnas.1807261116 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6410777/ http://www.ncbi.nlm.nih.gov/pubmed/30760586 http://dx.doi.org/10.1073/pnas.1807261116 Copyright © 2019 the Author(s). Published by PNAS. http://creativecommons.org/licenses/by/4.0/ This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY) (http://creativecommons.org/licenses/by/4.0/) . CC-BY Physical Sciences Text 2019 ftpubmed https://doi.org/10.1073/pnas.1807261116 2019-03-17T01:22:05Z Greenland ice cores provide excellent evidence of past abrupt climate changes. However, there is no universally accepted theory of how and why these Dansgaard–Oeschger (DO) events occur. Several mechanisms have been proposed to explain DO events, including sea ice, ice shelf buildup, ice sheets, atmospheric circulation, and meltwater changes. DO event temperature reconstructions depend on the stable water isotope ([Formula: see text] O) and nitrogen isotope measurements from Greenland ice cores: interpretation of these measurements holds the key to understanding the nature of DO events. Here, we demonstrate the primary importance of sea ice as a control on Greenland ice core [Formula: see text] O: 95% of the variability in [Formula: see text] O in southern Greenland is explained by DO event sea ice changes. Our suite of DO events, simulated using a general circulation model, accurately captures the amplitude of [Formula: see text] O enrichment during the abrupt DO event onsets. Simulated geographical variability is broadly consistent with available ice core evidence. We find an hitherto unknown sensitivity of the [Formula: see text] O paleothermometer to the magnitude of DO event temperature increase: the change in [Formula: see text] O per Kelvin temperature increase reduces with DO event amplitude. We show that this effect is controlled by precipitation seasonality. Text Greenland Greenland ice core Greenland ice cores ice core Ice Shelf Sea ice PubMed Central (PMC) Greenland Proceedings of the National Academy of Sciences 116 10 4099 4104 |
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English |
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Physical Sciences Sime, Louise C. Hopcroft, Peter O. Rhodes, Rachael H. Impact of abrupt sea ice loss on Greenland water isotopes during the last glacial period |
topic_facet |
Physical Sciences |
description |
Greenland ice cores provide excellent evidence of past abrupt climate changes. However, there is no universally accepted theory of how and why these Dansgaard–Oeschger (DO) events occur. Several mechanisms have been proposed to explain DO events, including sea ice, ice shelf buildup, ice sheets, atmospheric circulation, and meltwater changes. DO event temperature reconstructions depend on the stable water isotope ([Formula: see text] O) and nitrogen isotope measurements from Greenland ice cores: interpretation of these measurements holds the key to understanding the nature of DO events. Here, we demonstrate the primary importance of sea ice as a control on Greenland ice core [Formula: see text] O: 95% of the variability in [Formula: see text] O in southern Greenland is explained by DO event sea ice changes. Our suite of DO events, simulated using a general circulation model, accurately captures the amplitude of [Formula: see text] O enrichment during the abrupt DO event onsets. Simulated geographical variability is broadly consistent with available ice core evidence. We find an hitherto unknown sensitivity of the [Formula: see text] O paleothermometer to the magnitude of DO event temperature increase: the change in [Formula: see text] O per Kelvin temperature increase reduces with DO event amplitude. We show that this effect is controlled by precipitation seasonality. |
format |
Text |
author |
Sime, Louise C. Hopcroft, Peter O. Rhodes, Rachael H. |
author_facet |
Sime, Louise C. Hopcroft, Peter O. Rhodes, Rachael H. |
author_sort |
Sime, Louise C. |
title |
Impact of abrupt sea ice loss on Greenland water isotopes during the last glacial period |
title_short |
Impact of abrupt sea ice loss on Greenland water isotopes during the last glacial period |
title_full |
Impact of abrupt sea ice loss on Greenland water isotopes during the last glacial period |
title_fullStr |
Impact of abrupt sea ice loss on Greenland water isotopes during the last glacial period |
title_full_unstemmed |
Impact of abrupt sea ice loss on Greenland water isotopes during the last glacial period |
title_sort |
impact of abrupt sea ice loss on greenland water isotopes during the last glacial period |
publisher |
National Academy of Sciences |
publishDate |
2019 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6410777/ http://www.ncbi.nlm.nih.gov/pubmed/30760586 https://doi.org/10.1073/pnas.1807261116 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core Greenland ice cores ice core Ice Shelf Sea ice |
genre_facet |
Greenland Greenland ice core Greenland ice cores ice core Ice Shelf Sea ice |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6410777/ http://www.ncbi.nlm.nih.gov/pubmed/30760586 http://dx.doi.org/10.1073/pnas.1807261116 |
op_rights |
Copyright © 2019 the Author(s). Published by PNAS. http://creativecommons.org/licenses/by/4.0/ This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY) (http://creativecommons.org/licenses/by/4.0/) . |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1073/pnas.1807261116 |
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Proceedings of the National Academy of Sciences |
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116 |
container_issue |
10 |
container_start_page |
4099 |
op_container_end_page |
4104 |
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1766013984885964800 |