Younger Dryas cooling and the Greenland climate response to CO2
Greenland ice-core δ18O-temperature reconstructions suggest a dramatic cooling during the Younger Dryas (YD; 12.9–11.7 ka), with temperatures being as cold as the earlier Oldest Dryas (OD; 18.0–14.6 ka) despite an approximately 50 ppm rise in atmospheric CO2. Such YD cooling implies a muted Greenlan...
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ftpubmed:oai:pubmedcentral.nih.gov:3396542 2023-05-15T16:24:44+02:00 Younger Dryas cooling and the Greenland climate response to CO2 Liu, Zhengyu Carlson, Anders E. He, Feng Brady, Esther C. Otto-Bliesner, Bette L. Briegleb, Bruce P. Wehrenberg, Mark Clark, Peter U. Wu, Shu Cheng, Jun Zhang, Jiaxu Noone, David Zhu, Jiang 2012-07-10 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3396542 http://www.ncbi.nlm.nih.gov/pubmed/22733733 https://doi.org/10.1073/pnas.1202183109 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3396542 http://www.ncbi.nlm.nih.gov/pubmed/22733733 http://dx.doi.org/10.1073/pnas.1202183109 Physical Sciences Text 2012 ftpubmed https://doi.org/10.1073/pnas.1202183109 2013-09-04T10:05:26Z Greenland ice-core δ18O-temperature reconstructions suggest a dramatic cooling during the Younger Dryas (YD; 12.9–11.7 ka), with temperatures being as cold as the earlier Oldest Dryas (OD; 18.0–14.6 ka) despite an approximately 50 ppm rise in atmospheric CO2. Such YD cooling implies a muted Greenland climate response to atmospheric CO2, contrary to physical predictions of an enhanced high-latitude response to future increases in CO2. Here we show that North Atlantic sea surface temperature reconstructions as well as transient climate model simulations suggest that the YD over Greenland should be substantially warmer than the OD by approximately 5 °C in response to increased atmospheric CO2. Additional experiments with an isotope-enabled model suggest that the apparent YD temperature reconstruction derived from the ice-core δ18O record is likely an artifact of an altered temperature-δ18O relationship due to changing deglacial atmospheric circulation. Our results thus suggest that Greenland climate was warmer during the YD relative to the OD in response to rising atmospheric CO2, consistent with sea surface temperature reconstructions and physical predictions, and has a sensitivity approximately twice that found in climate models for current climate due to an enhanced albedo feedback during the last deglaciation. Text Greenland Greenland ice core ice core North Atlantic PubMed Central (PMC) Greenland Proceedings of the National Academy of Sciences 109 28 11101 11104 |
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Physical Sciences |
spellingShingle |
Physical Sciences Liu, Zhengyu Carlson, Anders E. He, Feng Brady, Esther C. Otto-Bliesner, Bette L. Briegleb, Bruce P. Wehrenberg, Mark Clark, Peter U. Wu, Shu Cheng, Jun Zhang, Jiaxu Noone, David Zhu, Jiang Younger Dryas cooling and the Greenland climate response to CO2 |
topic_facet |
Physical Sciences |
description |
Greenland ice-core δ18O-temperature reconstructions suggest a dramatic cooling during the Younger Dryas (YD; 12.9–11.7 ka), with temperatures being as cold as the earlier Oldest Dryas (OD; 18.0–14.6 ka) despite an approximately 50 ppm rise in atmospheric CO2. Such YD cooling implies a muted Greenland climate response to atmospheric CO2, contrary to physical predictions of an enhanced high-latitude response to future increases in CO2. Here we show that North Atlantic sea surface temperature reconstructions as well as transient climate model simulations suggest that the YD over Greenland should be substantially warmer than the OD by approximately 5 °C in response to increased atmospheric CO2. Additional experiments with an isotope-enabled model suggest that the apparent YD temperature reconstruction derived from the ice-core δ18O record is likely an artifact of an altered temperature-δ18O relationship due to changing deglacial atmospheric circulation. Our results thus suggest that Greenland climate was warmer during the YD relative to the OD in response to rising atmospheric CO2, consistent with sea surface temperature reconstructions and physical predictions, and has a sensitivity approximately twice that found in climate models for current climate due to an enhanced albedo feedback during the last deglaciation. |
format |
Text |
author |
Liu, Zhengyu Carlson, Anders E. He, Feng Brady, Esther C. Otto-Bliesner, Bette L. Briegleb, Bruce P. Wehrenberg, Mark Clark, Peter U. Wu, Shu Cheng, Jun Zhang, Jiaxu Noone, David Zhu, Jiang |
author_facet |
Liu, Zhengyu Carlson, Anders E. He, Feng Brady, Esther C. Otto-Bliesner, Bette L. Briegleb, Bruce P. Wehrenberg, Mark Clark, Peter U. Wu, Shu Cheng, Jun Zhang, Jiaxu Noone, David Zhu, Jiang |
author_sort |
Liu, Zhengyu |
title |
Younger Dryas cooling and the Greenland climate response to CO2 |
title_short |
Younger Dryas cooling and the Greenland climate response to CO2 |
title_full |
Younger Dryas cooling and the Greenland climate response to CO2 |
title_fullStr |
Younger Dryas cooling and the Greenland climate response to CO2 |
title_full_unstemmed |
Younger Dryas cooling and the Greenland climate response to CO2 |
title_sort |
younger dryas cooling and the greenland climate response to co2 |
publisher |
National Academy of Sciences |
publishDate |
2012 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3396542 http://www.ncbi.nlm.nih.gov/pubmed/22733733 https://doi.org/10.1073/pnas.1202183109 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core ice core North Atlantic |
genre_facet |
Greenland Greenland ice core ice core North Atlantic |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3396542 http://www.ncbi.nlm.nih.gov/pubmed/22733733 http://dx.doi.org/10.1073/pnas.1202183109 |
op_doi |
https://doi.org/10.1073/pnas.1202183109 |
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Proceedings of the National Academy of Sciences |
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109 |
container_issue |
28 |
container_start_page |
11101 |
op_container_end_page |
11104 |
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1766013279317000192 |