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...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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American Association for the Advancement of Science (AAAS)
2022
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| Online Access: | https://hdl.handle.net/1721.1/136379.2 |
| _version_ | 1811080025770819584 |
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| author | Mcgee, David Moreno Chamarro, Eduardo Marshall, John Galbraith, ED |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Mcgee, David Moreno Chamarro, Eduardo Marshall, John Galbraith, ED |
| author_sort | Mcgee, David |
| collection | MIT |
| 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. |
| first_indexed | 2024-09-23T11:24:31Z |
| format | Article |
| id | mit-1721.1/136379.2 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T11:24:31Z |
| publishDate | 2022 |
| publisher | American Association for the Advancement of Science (AAAS) |
| record_format | dspace |
| spelling | mit-1721.1/136379.22022-06-01T19:51:07Z Western U.S. lake expansions during Heinrich stadials linked to Pacific Hadley circulation Mcgee, David Moreno Chamarro, Eduardo Marshall, John Galbraith, ED Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences 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. NSF (EAR-1103379) NOAA award NA16OAR4310177 Compute Canada award (ayu-503) Canadian Foundation for Innovation award (25402) Spanish Ministry of Economy and Competitiveness - María de Maeztu Programme for Centres/Units of Excellence in R&D (MDM-2015-0552). 2022-06-01T19:51:06Z 2021-10-27T20:35:07Z 2022-06-01T19:51:06Z 2018 2019-07-23T18:04:26Z Article http://purl.org/eprint/type/JournalArticle 2375-2548 https://hdl.handle.net/1721.1/136379.2 en https://dx.doi.org/10.1126/SCIADV.AAV0118 Science Advances Creative Commons Attribution NonCommercial License 4.0 https://creativecommons.org/licenses/by-nc/4.0/ application/octet-stream American Association for the Advancement of Science (AAAS) Science Advances |
| spellingShingle | Mcgee, David Moreno Chamarro, Eduardo Marshall, John Galbraith, ED Western U.S. lake expansions during Heinrich stadials linked to Pacific Hadley circulation |
| title | 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_short | 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 |
| url | https://hdl.handle.net/1721.1/136379.2 |
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