Western U.S. lake expansions during Heinrich stadials linked to Pacific Hadley circulation
Copyright © 2018 The Authors, some rights reserved. Lake and cave records show that winter precipitation in the southwestern United States increased substantially during millennial-scale periods of Northern Hemisphere winter cooling known as Heinrich stadials. However, previous work has not produced...
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ftmit:oai:dspace.mit.edu:1721.1/136379 2023-06-11T04:03:19+02:00 Western U.S. lake expansions during Heinrich stadials linked to Pacific Hadley circulation McGee, D Moreno-Chamarro, E Marshall, J Galbraith, ED 2019-07-23T18:04:26Z application/pdf https://hdl.handle.net/1721.1/136379 en eng American Association for the Advancement of Science (AAAS) 10.1126/SCIADV.AAV0118 Science Advances https://hdl.handle.net/1721.1/136379 Creative Commons Attribution NonCommercial License 4.0 https://creativecommons.org/licenses/by-nc/4.0/ Science Advances Article http://purl.org/eprint/type/JournalArticle 2019 ftmit 2023-05-29T08:29:23Z Copyright © 2018 The Authors, some rights reserved. Lake and cave records show that winter precipitation in the southwestern United States increased substantially during millennial-scale periods of Northern Hemisphere winter cooling known as Heinrich stadials. However, previous work has not produced a clear picture of the atmospheric circulation changes driving these precipitation increases. Here, we combine data with model simulations to show that maximum winter precipitation anomalies were related to an intensified subtropical jet and a deepened, southeastward-shifted Aleutian Low, which together increased atmospheric river–like transport of subtropical moisture into the western United States. The jet and Aleutian Low changes are tied to the southward displacement of the intertropical convergence zone and the accompanying intensification of the Hadley circulation in the central Pacific. These results refine our understanding of atmospheric changes accompanying Heinrich stadials and highlight the need for accurate representations of tropical-extratropical teleconnections in simulations of past and future precipitation changes in the region. Article in Journal/Newspaper aleutian low DSpace@MIT (Massachusetts Institute of Technology) Pacific |
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Open Polar |
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DSpace@MIT (Massachusetts Institute of Technology) |
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ftmit |
language |
English |
description |
Copyright © 2018 The Authors, some rights reserved. Lake and cave records show that winter precipitation in the southwestern United States increased substantially during millennial-scale periods of Northern Hemisphere winter cooling known as Heinrich stadials. However, previous work has not produced a clear picture of the atmospheric circulation changes driving these precipitation increases. Here, we combine data with model simulations to show that maximum winter precipitation anomalies were related to an intensified subtropical jet and a deepened, southeastward-shifted Aleutian Low, which together increased atmospheric river–like transport of subtropical moisture into the western United States. The jet and Aleutian Low changes are tied to the southward displacement of the intertropical convergence zone and the accompanying intensification of the Hadley circulation in the central Pacific. These results refine our understanding of atmospheric changes accompanying Heinrich stadials and highlight the need for accurate representations of tropical-extratropical teleconnections in simulations of past and future precipitation changes in the region. |
format |
Article in Journal/Newspaper |
author |
McGee, D Moreno-Chamarro, E Marshall, J Galbraith, ED |
spellingShingle |
McGee, D Moreno-Chamarro, E Marshall, J Galbraith, ED Western U.S. lake expansions during Heinrich stadials linked to Pacific Hadley circulation |
author_facet |
McGee, D Moreno-Chamarro, E Marshall, J Galbraith, ED |
author_sort |
McGee, D |
title |
Western U.S. lake expansions during Heinrich stadials linked to Pacific Hadley circulation |
title_short |
Western U.S. lake expansions during Heinrich stadials linked to Pacific Hadley circulation |
title_full |
Western U.S. lake expansions during Heinrich stadials linked to Pacific Hadley circulation |
title_fullStr |
Western U.S. lake expansions during Heinrich stadials linked to Pacific Hadley circulation |
title_full_unstemmed |
Western U.S. lake expansions during Heinrich stadials linked to Pacific Hadley circulation |
title_sort |
western u.s. lake expansions during heinrich stadials linked to pacific hadley circulation |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2019 |
url |
https://hdl.handle.net/1721.1/136379 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
aleutian low |
genre_facet |
aleutian low |
op_source |
Science Advances |
op_relation |
10.1126/SCIADV.AAV0118 Science Advances https://hdl.handle.net/1721.1/136379 |
op_rights |
Creative Commons Attribution NonCommercial License 4.0 https://creativecommons.org/licenses/by-nc/4.0/ |
_version_ |
1768378635249516544 |