Consistent simulations of multiple proxy responses to an abrupt climate change event
Isotope, aerosol, and methane records document an abrupt cooling event across the Northern Hemisphere at 8.2 kiloyears before present (kyr), while separate geologic lines of evidence document the catastrophic drainage of the glacial Lakes Agassiz and Ojibway into the Hudson Bay at approximately the...
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ftpubmed:oai:pubmedcentral.nih.gov:1348000 2023-05-15T16:29:17+02:00 Consistent simulations of multiple proxy responses to an abrupt climate change event LeGrande, A. N. Schmidt, G. A. Shindell, D. T. Field, C. V. Miller, R. L. Koch, D. M. Faluvegi, G. Hoffmann, G. 2006-01-24 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1348000 http://www.ncbi.nlm.nih.gov/pubmed/16415159 https://doi.org/10.1073/pnas.0510095103 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1348000 http://www.ncbi.nlm.nih.gov/pubmed/16415159 http://dx.doi.org/10.1073/pnas.0510095103 Copyright © 2006, The National Academy of Sciences Physical Sciences Text 2006 ftpubmed https://doi.org/10.1073/pnas.0510095103 2013-08-30T20:09:52Z Isotope, aerosol, and methane records document an abrupt cooling event across the Northern Hemisphere at 8.2 kiloyears before present (kyr), while separate geologic lines of evidence document the catastrophic drainage of the glacial Lakes Agassiz and Ojibway into the Hudson Bay at approximately the same time. This melt water pulse may have been the catalyst for a decrease in North Atlantic Deep Water formation and subsequent cooling around the Northern Hemisphere. However, lack of direct evidence for ocean cooling has lead to speculation that this abrupt event was purely local to Greenland and called into question this proposed mechanism. We simulate the response to this melt water pulse using a coupled general circulation model that explicitly tracks water isotopes and with atmosphere-only experiments that calculate changes in atmospheric aerosol deposition (specifically 10Be and dust) and wetland methane emissions. The simulations produce a short period of significantly diminished North Atlantic Deep Water and are able to quantitatively match paleoclimate observations, including the lack of isotopic signal in the North Atlantic. This direct comparison with multiple proxy records provides compelling evidence that changes in ocean circulation played a major role in this abrupt climate change event. Text Greenland Hudson Bay North Atlantic Deep Water North Atlantic PubMed Central (PMC) Hudson Bay Greenland Hudson Proceedings of the National Academy of Sciences 103 4 837 842 |
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Physical Sciences LeGrande, A. N. Schmidt, G. A. Shindell, D. T. Field, C. V. Miller, R. L. Koch, D. M. Faluvegi, G. Hoffmann, G. Consistent simulations of multiple proxy responses to an abrupt climate change event |
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Physical Sciences |
description |
Isotope, aerosol, and methane records document an abrupt cooling event across the Northern Hemisphere at 8.2 kiloyears before present (kyr), while separate geologic lines of evidence document the catastrophic drainage of the glacial Lakes Agassiz and Ojibway into the Hudson Bay at approximately the same time. This melt water pulse may have been the catalyst for a decrease in North Atlantic Deep Water formation and subsequent cooling around the Northern Hemisphere. However, lack of direct evidence for ocean cooling has lead to speculation that this abrupt event was purely local to Greenland and called into question this proposed mechanism. We simulate the response to this melt water pulse using a coupled general circulation model that explicitly tracks water isotopes and with atmosphere-only experiments that calculate changes in atmospheric aerosol deposition (specifically 10Be and dust) and wetland methane emissions. The simulations produce a short period of significantly diminished North Atlantic Deep Water and are able to quantitatively match paleoclimate observations, including the lack of isotopic signal in the North Atlantic. This direct comparison with multiple proxy records provides compelling evidence that changes in ocean circulation played a major role in this abrupt climate change event. |
format |
Text |
author |
LeGrande, A. N. Schmidt, G. A. Shindell, D. T. Field, C. V. Miller, R. L. Koch, D. M. Faluvegi, G. Hoffmann, G. |
author_facet |
LeGrande, A. N. Schmidt, G. A. Shindell, D. T. Field, C. V. Miller, R. L. Koch, D. M. Faluvegi, G. Hoffmann, G. |
author_sort |
LeGrande, A. N. |
title |
Consistent simulations of multiple proxy responses to an abrupt climate change event |
title_short |
Consistent simulations of multiple proxy responses to an abrupt climate change event |
title_full |
Consistent simulations of multiple proxy responses to an abrupt climate change event |
title_fullStr |
Consistent simulations of multiple proxy responses to an abrupt climate change event |
title_full_unstemmed |
Consistent simulations of multiple proxy responses to an abrupt climate change event |
title_sort |
consistent simulations of multiple proxy responses to an abrupt climate change event |
publisher |
National Academy of Sciences |
publishDate |
2006 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1348000 http://www.ncbi.nlm.nih.gov/pubmed/16415159 https://doi.org/10.1073/pnas.0510095103 |
geographic |
Hudson Bay Greenland Hudson |
geographic_facet |
Hudson Bay Greenland Hudson |
genre |
Greenland Hudson Bay North Atlantic Deep Water North Atlantic |
genre_facet |
Greenland Hudson Bay North Atlantic Deep Water North Atlantic |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1348000 http://www.ncbi.nlm.nih.gov/pubmed/16415159 http://dx.doi.org/10.1073/pnas.0510095103 |
op_rights |
Copyright © 2006, The National Academy of Sciences |
op_doi |
https://doi.org/10.1073/pnas.0510095103 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
103 |
container_issue |
4 |
container_start_page |
837 |
op_container_end_page |
842 |
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1766018983058735104 |