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 (SST) of the western South Atlantic, and in mean air temperatures (MAT) over southeastern South America. It was suggested, f...
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ftawi:oai:epic.awi.de:38338 2024-09-09T19:57:35+00:00 Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1 Chiessi, C. M. Mulitza, S. Mollenhauer, G. Silva, J. B. Groeneveld, J. Prange, M. 2015 https://epic.awi.de/id/eprint/38338/ https://doi.org/10.5194/cp-11-915-2015 https://hdl.handle.net/10013/epic.45739 unknown Chiessi, C. M. , Mulitza, S. , Mollenhauer, G. orcid:0000-0001-5138-564X , Silva, J. B. , Groeneveld, J. and Prange, M. (2015) Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1 , Climate of the Past, 11 (6), pp. 915-929 . doi:10.5194/cp-11-915-2015 <https://doi.org/10.5194/cp-11-915-2015> , hdl:10013/epic.45739 EPIC3Climate of the Past, 11(6), pp. 915-929, ISSN: 1814-9332 Article isiRev 2015 ftawi https://doi.org/10.5194/cp-11-915-2015 2024-06-24T04:12:21Z During Termination 1, millennial-scale weakening events of the Atlantic meridional overturning circulation (AMOC) supposedly produced major changes in sea surface temperatures (SST) of the western South Atlantic, and in mean air temperatures (MAT) over southeastern South America. It was 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 CO2 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 to drive the Earth out of the last glacial. Article in Journal/Newspaper North Atlantic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Climate of the Past 11 6 915 929 |
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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 |
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During Termination 1, millennial-scale weakening events of the Atlantic meridional overturning circulation (AMOC) supposedly produced major changes in sea surface temperatures (SST) of the western South Atlantic, and in mean air temperatures (MAT) over southeastern South America. It was 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 CO2 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 to drive the Earth out of the last glacial. |
format |
Article in Journal/Newspaper |
author |
Chiessi, C. M. Mulitza, S. Mollenhauer, G. Silva, J. B. Groeneveld, J. Prange, M. |
spellingShingle |
Chiessi, C. M. Mulitza, S. Mollenhauer, G. Silva, J. B. Groeneveld, J. Prange, M. Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1 |
author_facet |
Chiessi, C. M. Mulitza, S. Mollenhauer, G. Silva, J. B. Groeneveld, J. Prange, M. |
author_sort |
Chiessi, C. M. |
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 |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/38338/ https://doi.org/10.5194/cp-11-915-2015 https://hdl.handle.net/10013/epic.45739 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
EPIC3Climate of the Past, 11(6), pp. 915-929, ISSN: 1814-9332 |
op_relation |
Chiessi, C. M. , Mulitza, S. , Mollenhauer, G. orcid:0000-0001-5138-564X , Silva, J. B. , Groeneveld, J. and Prange, M. (2015) Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1 , Climate of the Past, 11 (6), pp. 915-929 . doi:10.5194/cp-11-915-2015 <https://doi.org/10.5194/cp-11-915-2015> , hdl:10013/epic.45739 |
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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1809928505264177152 |