Equatorial Pacific forcing of western Amazonian precipitation during Heinrich Stadial 1
Abundant hydroclimatic evidence from western Amazonia and the adjacent Andes documents wet conditions during Heinrich Stadial 1 (HS1, 18-15 ka), a cold period in the high latitudes of the North Atlantic. This precipitation anomaly was attributed to a strengthening of the South American summer monsoo...
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Online Access: | https://resolver.sub.uni-goettingen.de/purl?gro-2/39179 https://resolver.sub.uni-goettingen.de/purl?gs-1/13951 https://doi.org/10.1038/srep35866 |
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ftsubgoettingen:oai:publications.goettingen-research-online.de:2/39179 2023-09-05T13:21:33+02:00 Equatorial Pacific forcing of western Amazonian precipitation during Heinrich Stadial 1 Zhang, Y. Zhang, X. U. Chiessi, Cristiano M. Mulitza, Stefan Zhang, X. Lohmann, Gerrit Prange, Matthias Behling, Hermann Zabel, Matthias Govin, Aline Sawakuchi, Andr O. Cruz, Francisco W. Wefer, Gerold 2016 https://resolver.sub.uni-goettingen.de/purl?gro-2/39179 https://resolver.sub.uni-goettingen.de/purl?gs-1/13951 https://doi.org/10.1038/srep35866 unknown Nature Publishing Group 2045-2322 https://resolver.sub.uni-goettingen.de/purl?gro-2/39179 doi:10.1038/srep35866 27779213 000386006200001 https://resolver.sub.uni-goettingen.de/purl?gs-1/13951 CC BY 4.0 https://creativecommons.org/licenses/by/4.0 journal_article published yes published_version 2016 ftsubgoettingen https://doi.org/10.1038/srep35866 2023-08-20T22:13:26Z Abundant hydroclimatic evidence from western Amazonia and the adjacent Andes documents wet conditions during Heinrich Stadial 1 (HS1, 18-15 ka), a cold period in the high latitudes of the North Atlantic. This precipitation anomaly was attributed to a strengthening of the South American summer monsoon due to a change in the Atlantic interhemispheric sea surface temperature (SST) gradient. However, the physical viability of this mechanism has never been rigorously tested. We address this issue by combining a thorough compilation of tropical South American paleorecords and a set of atmosphere model sensitivity experiments. Our results show that the Atlantic SST variations alone, although leading to dry conditions in northern South America and wet conditions in northeastern Brazil, cannot produce increased precipitation over western Amazonia and the adjacent Andes during HS1. Instead, an eastern equatorial Pacific SST increase (i.e., 0.5-1.5 degrees C), in response to the slowdown of the Atlantic Meridional Overturning Circulation during HS1, is crucial to generate the wet conditions in these regions. The mechanism works via anomalous low sea level pressure over the eastern equatorial Pacific, which promotes a regional easterly low-level wind anomaly and moisture recycling from central Amazonia towards the Andes. Article in Journal/Newspaper North Atlantic Georg-August-Universität Göttingen: GoeScholar Pacific Scientific Reports 6 1 |
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Georg-August-Universität Göttingen: GoeScholar |
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ftsubgoettingen |
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unknown |
description |
Abundant hydroclimatic evidence from western Amazonia and the adjacent Andes documents wet conditions during Heinrich Stadial 1 (HS1, 18-15 ka), a cold period in the high latitudes of the North Atlantic. This precipitation anomaly was attributed to a strengthening of the South American summer monsoon due to a change in the Atlantic interhemispheric sea surface temperature (SST) gradient. However, the physical viability of this mechanism has never been rigorously tested. We address this issue by combining a thorough compilation of tropical South American paleorecords and a set of atmosphere model sensitivity experiments. Our results show that the Atlantic SST variations alone, although leading to dry conditions in northern South America and wet conditions in northeastern Brazil, cannot produce increased precipitation over western Amazonia and the adjacent Andes during HS1. Instead, an eastern equatorial Pacific SST increase (i.e., 0.5-1.5 degrees C), in response to the slowdown of the Atlantic Meridional Overturning Circulation during HS1, is crucial to generate the wet conditions in these regions. The mechanism works via anomalous low sea level pressure over the eastern equatorial Pacific, which promotes a regional easterly low-level wind anomaly and moisture recycling from central Amazonia towards the Andes. |
format |
Article in Journal/Newspaper |
author |
Zhang, Y. Zhang, X. U. Chiessi, Cristiano M. Mulitza, Stefan Zhang, X. Lohmann, Gerrit Prange, Matthias Behling, Hermann Zabel, Matthias Govin, Aline Sawakuchi, Andr O. Cruz, Francisco W. Wefer, Gerold |
spellingShingle |
Zhang, Y. Zhang, X. U. Chiessi, Cristiano M. Mulitza, Stefan Zhang, X. Lohmann, Gerrit Prange, Matthias Behling, Hermann Zabel, Matthias Govin, Aline Sawakuchi, Andr O. Cruz, Francisco W. Wefer, Gerold Equatorial Pacific forcing of western Amazonian precipitation during Heinrich Stadial 1 |
author_facet |
Zhang, Y. Zhang, X. U. Chiessi, Cristiano M. Mulitza, Stefan Zhang, X. Lohmann, Gerrit Prange, Matthias Behling, Hermann Zabel, Matthias Govin, Aline Sawakuchi, Andr O. Cruz, Francisco W. Wefer, Gerold |
author_sort |
Zhang, Y. |
title |
Equatorial Pacific forcing of western Amazonian precipitation during Heinrich Stadial 1 |
title_short |
Equatorial Pacific forcing of western Amazonian precipitation during Heinrich Stadial 1 |
title_full |
Equatorial Pacific forcing of western Amazonian precipitation during Heinrich Stadial 1 |
title_fullStr |
Equatorial Pacific forcing of western Amazonian precipitation during Heinrich Stadial 1 |
title_full_unstemmed |
Equatorial Pacific forcing of western Amazonian precipitation during Heinrich Stadial 1 |
title_sort |
equatorial pacific forcing of western amazonian precipitation during heinrich stadial 1 |
publisher |
Nature Publishing Group |
publishDate |
2016 |
url |
https://resolver.sub.uni-goettingen.de/purl?gro-2/39179 https://resolver.sub.uni-goettingen.de/purl?gs-1/13951 https://doi.org/10.1038/srep35866 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
2045-2322 https://resolver.sub.uni-goettingen.de/purl?gro-2/39179 doi:10.1038/srep35866 27779213 000386006200001 https://resolver.sub.uni-goettingen.de/purl?gs-1/13951 |
op_rights |
CC BY 4.0 https://creativecommons.org/licenses/by/4.0 |
op_doi |
https://doi.org/10.1038/srep35866 |
container_title |
Scientific Reports |
container_volume |
6 |
container_issue |
1 |
_version_ |
1776202158335590400 |