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Andean drought and glacial retreat tied to Greenland warming during the last glacial period

Abrupt warming events recorded in Greenland ice cores known as Dansgaard-Oeschger (DO) interstadials are linked to changes in tropical circulation during the last glacial cycle. Corresponding variations in South American summer monsoon (SASM) strength are documented, most commonly, in isotopic recor...

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Autores principales: Woods, Arielle, Rodbell, Donald T., Abbott, Mark B., Hatfield, Robert G., Chen, Christine Y., Lehmann, Sophie B., McGee, David, Weidhaas, Nicholas C., Tapia, Pedro M., Valero-Garcés, Blas L., Bush, Mark B., Stoner, Joseph S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7552390/
https://www.ncbi.nlm.nih.gov/pubmed/33046707
http://dx.doi.org/10.1038/s41467-020-19000-8
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author Woods, Arielle
Rodbell, Donald T.
Abbott, Mark B.
Hatfield, Robert G.
Chen, Christine Y.
Lehmann, Sophie B.
McGee, David
Weidhaas, Nicholas C.
Tapia, Pedro M.
Valero-Garcés, Blas L.
Bush, Mark B.
Stoner, Joseph S.
author_facet Woods, Arielle
Rodbell, Donald T.
Abbott, Mark B.
Hatfield, Robert G.
Chen, Christine Y.
Lehmann, Sophie B.
McGee, David
Weidhaas, Nicholas C.
Tapia, Pedro M.
Valero-Garcés, Blas L.
Bush, Mark B.
Stoner, Joseph S.
author_sort Woods, Arielle
collection PubMed
description Abrupt warming events recorded in Greenland ice cores known as Dansgaard-Oeschger (DO) interstadials are linked to changes in tropical circulation during the last glacial cycle. Corresponding variations in South American summer monsoon (SASM) strength are documented, most commonly, in isotopic records from speleothems, but less is known about how these changes affected precipitation and Andean glacier mass balance. Here we present a sediment record spanning the last ~50 ka from Lake Junín (Peru) in the tropical Andes that has sufficient chronologic precision to document abrupt climatic events on a centennial-millennial time scale. DO events involved the near-complete disappearance of glaciers below 4700 masl in the eastern Andean cordillera and major reductions in the level of Peru’s second largest lake. Our results reveal the magnitude of the hydroclimatic disruptions in the highest reaches of the Amazon Basin that were caused by a weakening of the SASM during abrupt arctic warming. Accentuated warming in the Arctic could lead to significant reductions in the precipitation-evaporation balance of the southern tropical Andes with deleterious effects on this densely populated region of South America.
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spelling pubmed-75523902020-10-19 Andean drought and glacial retreat tied to Greenland warming during the last glacial period Woods, Arielle Rodbell, Donald T. Abbott, Mark B. Hatfield, Robert G. Chen, Christine Y. Lehmann, Sophie B. McGee, David Weidhaas, Nicholas C. Tapia, Pedro M. Valero-Garcés, Blas L. Bush, Mark B. Stoner, Joseph S. Nat Commun Article Abrupt warming events recorded in Greenland ice cores known as Dansgaard-Oeschger (DO) interstadials are linked to changes in tropical circulation during the last glacial cycle. Corresponding variations in South American summer monsoon (SASM) strength are documented, most commonly, in isotopic records from speleothems, but less is known about how these changes affected precipitation and Andean glacier mass balance. Here we present a sediment record spanning the last ~50 ka from Lake Junín (Peru) in the tropical Andes that has sufficient chronologic precision to document abrupt climatic events on a centennial-millennial time scale. DO events involved the near-complete disappearance of glaciers below 4700 masl in the eastern Andean cordillera and major reductions in the level of Peru’s second largest lake. Our results reveal the magnitude of the hydroclimatic disruptions in the highest reaches of the Amazon Basin that were caused by a weakening of the SASM during abrupt arctic warming. Accentuated warming in the Arctic could lead to significant reductions in the precipitation-evaporation balance of the southern tropical Andes with deleterious effects on this densely populated region of South America. Nature Publishing Group UK 2020-10-12 /pmc/articles/PMC7552390/ /pubmed/33046707 http://dx.doi.org/10.1038/s41467-020-19000-8 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Woods, Arielle
Rodbell, Donald T.
Abbott, Mark B.
Hatfield, Robert G.
Chen, Christine Y.
Lehmann, Sophie B.
McGee, David
Weidhaas, Nicholas C.
Tapia, Pedro M.
Valero-Garcés, Blas L.
Bush, Mark B.
Stoner, Joseph S.
Andean drought and glacial retreat tied to Greenland warming during the last glacial period
title Andean drought and glacial retreat tied to Greenland warming during the last glacial period
title_full Andean drought and glacial retreat tied to Greenland warming during the last glacial period
title_fullStr Andean drought and glacial retreat tied to Greenland warming during the last glacial period
title_full_unstemmed Andean drought and glacial retreat tied to Greenland warming during the last glacial period
title_short Andean drought and glacial retreat tied to Greenland warming during the last glacial period
title_sort andean drought and glacial retreat tied to greenland warming during the last glacial period
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7552390/
https://www.ncbi.nlm.nih.gov/pubmed/33046707
http://dx.doi.org/10.1038/s41467-020-19000-8
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