Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1
During Termination 1, millennial-scale weakening events of the Atlantic meridional overturning circulation (AMOC) supposedly produced major changes in sea surface temperatures (SSTs) of the western South Atlantic, and in mean air temperatures (MATs) over southeastern South America. It has been sugge...
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ftdoajarticles:oai:doaj.org/article:3d17095286a84ce19ed7afcf7b6b78ca 2023-05-15T17:35:21+02:00 Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1 C. M. Chiessi S. Mulitza G. Mollenhauer J. B. Silva J. Groeneveld M. Prange 2015-06-01T00:00:00Z https://doi.org/10.5194/cp-11-915-2015 https://doaj.org/article/3d17095286a84ce19ed7afcf7b6b78ca EN eng Copernicus Publications http://www.clim-past.net/11/915/2015/cp-11-915-2015.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-11-915-2015 https://doaj.org/article/3d17095286a84ce19ed7afcf7b6b78ca Climate of the Past, Vol 11, Iss 6, Pp 915-929 (2015) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2015 ftdoajarticles https://doi.org/10.5194/cp-11-915-2015 2022-12-31T02:08:30Z During Termination 1, millennial-scale weakening events of the Atlantic meridional overturning circulation (AMOC) supposedly produced major changes in sea surface temperatures (SSTs) of the western South Atlantic, and in mean air temperatures (MATs) over southeastern South America. It has been suggested, for instance, that the Brazil Current (BC) would strengthen (weaken) and the North Brazil Current (NBC) would weaken (strengthen) during slowdown (speed-up) events of the AMOC. This anti-phase pattern was claimed to be a necessary response to the decreased North Atlantic heat piracy during periods of weak AMOC. However, the thermal evolution of the western South Atlantic and the adjacent continent is so far largely unknown. Here we address this issue, presenting high-temporal-resolution SST and MAT records from the BC and southeastern South America, respectively. We identify a warming in the western South Atlantic during Heinrich Stadial 1 (HS1), which is followed first by a drop and then by increasing temperatures during the Bølling–Allerød, in phase with an existing SST record from the NBC. Additionally, a similar SST evolution is shown by a southernmost eastern South Atlantic record, suggesting a South Atlantic-wide pattern in SST evolution during most of Termination 1. Over southeastern South America, our MAT record shows a two-step increase during Termination 1, synchronous with atmospheric CO 2 rise (i.e., during the second half of HS1 and during the Younger Dryas), and lagging abrupt SST changes by several thousand years. This delay corroborates the notion that the long duration of HS1 was fundamental in driving the Earth out of the last glacial. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Climate of the Past 11 6 915 929 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
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English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
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Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 C. M. Chiessi S. Mulitza G. Mollenhauer J. B. Silva J. Groeneveld M. Prange Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1 |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
During Termination 1, millennial-scale weakening events of the Atlantic meridional overturning circulation (AMOC) supposedly produced major changes in sea surface temperatures (SSTs) of the western South Atlantic, and in mean air temperatures (MATs) over southeastern South America. It has been suggested, for instance, that the Brazil Current (BC) would strengthen (weaken) and the North Brazil Current (NBC) would weaken (strengthen) during slowdown (speed-up) events of the AMOC. This anti-phase pattern was claimed to be a necessary response to the decreased North Atlantic heat piracy during periods of weak AMOC. However, the thermal evolution of the western South Atlantic and the adjacent continent is so far largely unknown. Here we address this issue, presenting high-temporal-resolution SST and MAT records from the BC and southeastern South America, respectively. We identify a warming in the western South Atlantic during Heinrich Stadial 1 (HS1), which is followed first by a drop and then by increasing temperatures during the Bølling–Allerød, in phase with an existing SST record from the NBC. Additionally, a similar SST evolution is shown by a southernmost eastern South Atlantic record, suggesting a South Atlantic-wide pattern in SST evolution during most of Termination 1. Over southeastern South America, our MAT record shows a two-step increase during Termination 1, synchronous with atmospheric CO 2 rise (i.e., during the second half of HS1 and during the Younger Dryas), and lagging abrupt SST changes by several thousand years. This delay corroborates the notion that the long duration of HS1 was fundamental in driving the Earth out of the last glacial. |
format |
Article in Journal/Newspaper |
author |
C. M. Chiessi S. Mulitza G. Mollenhauer J. B. Silva J. Groeneveld M. Prange |
author_facet |
C. M. Chiessi S. Mulitza G. Mollenhauer J. B. Silva J. Groeneveld M. Prange |
author_sort |
C. M. Chiessi |
title |
Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1 |
title_short |
Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1 |
title_full |
Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1 |
title_fullStr |
Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1 |
title_full_unstemmed |
Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1 |
title_sort |
thermal evolution of the western south atlantic and the adjacent continent during termination 1 |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/cp-11-915-2015 https://doaj.org/article/3d17095286a84ce19ed7afcf7b6b78ca |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Climate of the Past, Vol 11, Iss 6, Pp 915-929 (2015) |
op_relation |
http://www.clim-past.net/11/915/2015/cp-11-915-2015.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-11-915-2015 https://doaj.org/article/3d17095286a84ce19ed7afcf7b6b78ca |
op_doi |
https://doi.org/10.5194/cp-11-915-2015 |
container_title |
Climate of the Past |
container_volume |
11 |
container_issue |
6 |
container_start_page |
915 |
op_container_end_page |
929 |
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1766134501415583744 |