Moisture transport across Central America as a positive feedback on abrupt climatic changes
International audience Moisture transport from the Atlantic to the Pacific ocean across Central America leads to relatively high salinities in the North Atlantic Ocean(1) and contributes to the formation of North Atlantic Deep Water(2). This deep water formation varied strongly between Dansgaard/ Oe...
Published in: | Nature |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2007
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Online Access: | https://hal.science/hal-01458326 https://doi.org/10.1038/nature05578 |
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Aix-Marseille Université: HAL |
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English |
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[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
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[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Leduc, Guillaume Vidal, Laurence Tachikawa, K. Rostek, Frauke Sonzogni, Corinne Beaufort, Luc, L Bard, Edouard Moisture transport across Central America as a positive feedback on abrupt climatic changes |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Moisture transport from the Atlantic to the Pacific ocean across Central America leads to relatively high salinities in the North Atlantic Ocean(1) and contributes to the formation of North Atlantic Deep Water(2). This deep water formation varied strongly between Dansgaard/ Oeschger interstadials and Heinrich events millennial- scale abrupt warm and cold events, respectively, during the last glacial period(3). Increases in the moisture transport across Central America have been proposed to coincide with northerly shifts of the Intertropical Convergence Zone and with Dansgaard/ Oeschger interstadials, with opposite changes for Heinrich events(4). Here we reconstruct sea surface salinities in the eastern equatorial Pacific Ocean over the past 90,000 years by comparing palaeotemperature estimates from alkenones and Mg/Ca ratios with foraminiferal oxygen isotope ratios that vary with both temperature and salinity. We detect millennial- scale fluctuations of sea surface salinities in the eastern equatorial Pacific Ocean of up to two to four practical salinity units. High salinities are associated with the southward migration of the tropical Atlantic Intertropical Convergence Zone, coinciding with Heinrich events and with Greenland stadials(5). The amplitudes of these salinity variations are significantly larger on the Pacific side of the Panama isthmus, as inferred from a comparison of our data with a palaeoclimate record from the Caribbean basin(6). We conclude that millennial-scale fluctuations of moisture transport constitute an important feedback mechanism for abrupt climate changes, modulating the North Atlantic freshwater budget and hence North Atlantic Deep Water formation. |
author2 |
Collège de France - Chaire Evolution du climat et de l'océan Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Géochimie & géochrono Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Leduc, Guillaume Vidal, Laurence Tachikawa, K. Rostek, Frauke Sonzogni, Corinne Beaufort, Luc, L Bard, Edouard |
author_facet |
Leduc, Guillaume Vidal, Laurence Tachikawa, K. Rostek, Frauke Sonzogni, Corinne Beaufort, Luc, L Bard, Edouard |
author_sort |
Leduc, Guillaume |
title |
Moisture transport across Central America as a positive feedback on abrupt climatic changes |
title_short |
Moisture transport across Central America as a positive feedback on abrupt climatic changes |
title_full |
Moisture transport across Central America as a positive feedback on abrupt climatic changes |
title_fullStr |
Moisture transport across Central America as a positive feedback on abrupt climatic changes |
title_full_unstemmed |
Moisture transport across Central America as a positive feedback on abrupt climatic changes |
title_sort |
moisture transport across central america as a positive feedback on abrupt climatic changes |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-01458326 https://doi.org/10.1038/nature05578 |
geographic |
Greenland Pacific |
geographic_facet |
Greenland Pacific |
genre |
Greenland North Atlantic Deep Water North Atlantic |
genre_facet |
Greenland North Atlantic Deep Water North Atlantic |
op_source |
ISSN: 0028-0836 EISSN: 1476-4687 Nature https://hal.science/hal-01458326 Nature, 2007, 445 (7130), pp.908-911. ⟨10.1038/nature05578⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.1038/nature05578 hal-01458326 https://hal.science/hal-01458326 doi:10.1038/nature05578 |
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https://doi.org/10.1038/nature05578 |
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Nature |
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445 |
container_issue |
7130 |
container_start_page |
908 |
op_container_end_page |
911 |
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1785584193873379328 |
spelling |
ftunivaixmarseil:oai:HAL:hal-01458326v1 2023-12-17T10:31:02+01:00 Moisture transport across Central America as a positive feedback on abrupt climatic changes Leduc, Guillaume Vidal, Laurence Tachikawa, K. Rostek, Frauke Sonzogni, Corinne Beaufort, Luc, L Bard, Edouard Collège de France - Chaire Evolution du climat et de l'océan Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Géochimie & géochrono Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2007-02 https://hal.science/hal-01458326 https://doi.org/10.1038/nature05578 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/nature05578 hal-01458326 https://hal.science/hal-01458326 doi:10.1038/nature05578 ISSN: 0028-0836 EISSN: 1476-4687 Nature https://hal.science/hal-01458326 Nature, 2007, 445 (7130), pp.908-911. ⟨10.1038/nature05578⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2007 ftunivaixmarseil https://doi.org/10.1038/nature05578 2023-11-21T23:51:40Z International audience Moisture transport from the Atlantic to the Pacific ocean across Central America leads to relatively high salinities in the North Atlantic Ocean(1) and contributes to the formation of North Atlantic Deep Water(2). This deep water formation varied strongly between Dansgaard/ Oeschger interstadials and Heinrich events millennial- scale abrupt warm and cold events, respectively, during the last glacial period(3). Increases in the moisture transport across Central America have been proposed to coincide with northerly shifts of the Intertropical Convergence Zone and with Dansgaard/ Oeschger interstadials, with opposite changes for Heinrich events(4). Here we reconstruct sea surface salinities in the eastern equatorial Pacific Ocean over the past 90,000 years by comparing palaeotemperature estimates from alkenones and Mg/Ca ratios with foraminiferal oxygen isotope ratios that vary with both temperature and salinity. We detect millennial- scale fluctuations of sea surface salinities in the eastern equatorial Pacific Ocean of up to two to four practical salinity units. High salinities are associated with the southward migration of the tropical Atlantic Intertropical Convergence Zone, coinciding with Heinrich events and with Greenland stadials(5). The amplitudes of these salinity variations are significantly larger on the Pacific side of the Panama isthmus, as inferred from a comparison of our data with a palaeoclimate record from the Caribbean basin(6). We conclude that millennial-scale fluctuations of moisture transport constitute an important feedback mechanism for abrupt climate changes, modulating the North Atlantic freshwater budget and hence North Atlantic Deep Water formation. Article in Journal/Newspaper Greenland North Atlantic Deep Water North Atlantic Aix-Marseille Université: HAL Greenland Pacific Nature 445 7130 908 911 |