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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ftawi:oai:epic.awi.de:43011 2024-09-09T19:57:17+00:00 Equatorial Pacific forcing of western Amazonian precipitation during Heinrich Stadial 1 Zhang, Yancheng Zhang, Xu Chiessi, Cristiano M. Mulitza, Stefan Zhang, Xiao Lohmann, Gerrit Prange, Matthias Behling, Hermann Zabel, Matthias Govin, Aline Sawakuchi, André O. Cruz, Francisco W. Wefer, Gerold 2016-10-25 https://epic.awi.de/id/eprint/43011/ https://hdl.handle.net/10013/epic.49907 unknown NATURE PUBLISHING GROUP Zhang, Y. , Zhang, X. orcid:0000-0003-1833-9689 , Chiessi, C. M. , Mulitza, S. , Zhang, X. , Lohmann, G. orcid:0000-0003-2089-733X , Prange, M. , Behling, H. , Zabel, M. , Govin, A. , Sawakuchi, A. O. , Cruz, F. W. and Wefer, G. (2016) Equatorial Pacific forcing of western Amazonian precipitation during Heinrich Stadial 1 , Scientific Reports, 6 . doi:10.1038/srep35866 <https://doi.org/10.1038/srep35866> , hdl:10013/epic.49907 EPIC3Scientific Reports, NATURE PUBLISHING GROUP, 6, ISSN: 2045-2322 Article isiRev 2016 ftawi https://doi.org/10.1038/srep35866 2024-06-24T04:16:35Z 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 °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 Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Pacific Scientific Reports 6 1 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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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 °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, Yancheng Zhang, Xu Chiessi, Cristiano M. Mulitza, Stefan Zhang, Xiao Lohmann, Gerrit Prange, Matthias Behling, Hermann Zabel, Matthias Govin, Aline Sawakuchi, André O. Cruz, Francisco W. Wefer, Gerold |
spellingShingle |
Zhang, Yancheng Zhang, Xu Chiessi, Cristiano M. Mulitza, Stefan Zhang, Xiao Lohmann, Gerrit Prange, Matthias Behling, Hermann Zabel, Matthias Govin, Aline Sawakuchi, André O. Cruz, Francisco W. Wefer, Gerold Equatorial Pacific forcing of western Amazonian precipitation during Heinrich Stadial 1 |
author_facet |
Zhang, Yancheng Zhang, Xu Chiessi, Cristiano M. Mulitza, Stefan Zhang, Xiao Lohmann, Gerrit Prange, Matthias Behling, Hermann Zabel, Matthias Govin, Aline Sawakuchi, André O. Cruz, Francisco W. Wefer, Gerold |
author_sort |
Zhang, Yancheng |
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://epic.awi.de/id/eprint/43011/ https://hdl.handle.net/10013/epic.49907 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
EPIC3Scientific Reports, NATURE PUBLISHING GROUP, 6, ISSN: 2045-2322 |
op_relation |
Zhang, Y. , Zhang, X. orcid:0000-0003-1833-9689 , Chiessi, C. M. , Mulitza, S. , Zhang, X. , Lohmann, G. orcid:0000-0003-2089-733X , Prange, M. , Behling, H. , Zabel, M. , Govin, A. , Sawakuchi, A. O. , Cruz, F. W. and Wefer, G. (2016) Equatorial Pacific forcing of western Amazonian precipitation during Heinrich Stadial 1 , Scientific Reports, 6 . doi:10.1038/srep35866 <https://doi.org/10.1038/srep35866> , hdl:10013/epic.49907 |
op_doi |
https://doi.org/10.1038/srep35866 |
container_title |
Scientific Reports |
container_volume |
6 |
container_issue |
1 |
_version_ |
1809928191893045248 |