Climatic influence of the latest Antarctic isotope maximum of the last glacial period (AIM4) on Southern Patagonia
International audience This paper presents the first detailed paleoclimate reconstruction of the latest Antarctic isotope maximum (AIM4, similar to 33-29 ka cal. BP) at 52 degrees S in continental southeastern Argentine Patagonia. High-resolution sedimentological and geochemical analyses of sediment...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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Online Access: | https://hal.science/hal-01765589 https://doi.org/10.1016/j.palaeo.2017.02.020 |
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ftunivnantes:oai:HAL:hal-01765589v1 2023-05-15T13:49:49+02:00 Climatic influence of the latest Antarctic isotope maximum of the last glacial period (AIM4) on Southern Patagonia Jouve, Guillaume Lise-Pronovost, Agathe Francus, Pierre de Coninck, Arnaud S. Team, Pasado Sci Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) 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) 2017 https://hal.science/hal-01765589 https://doi.org/10.1016/j.palaeo.2017.02.020 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.palaeo.2017.02.020 hal-01765589 https://hal.science/hal-01765589 doi:10.1016/j.palaeo.2017.02.020 ISSN: 0031-0182 Palaeogeography, Palaeoclimatology, Palaeoecology https://hal.science/hal-01765589 Palaeogeography, Palaeoclimatology, Palaeoecology, 2017, 472, pp.33-50. ⟨10.1016/j.palaeo.2017.02.020⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2017 ftunivnantes https://doi.org/10.1016/j.palaeo.2017.02.020 2023-02-08T08:42:48Z International audience This paper presents the first detailed paleoclimate reconstruction of the latest Antarctic isotope maximum (AIM4, similar to 33-29 ka cal. BP) at 52 degrees S in continental southeastern Argentine Patagonia. High-resolution sedimentological and geochemical analyses of sediments from the maar lake Potrok Aike (PTA) reveal a decrease in the thickness of flood-induced turbidites and a series of wind burst deposits during AIM4, both pointing to increasingly drier conditions. This interpretation is also supported by a significant amount of runoff-driven micropumices incorporated within the sediments that suggests a lower lake level with canyons incising thick tephra deposits around the lake. Increased gustiness and/or dust availability in southeast Patagonia, together with intensified Antarctic circumpolar circulation in the Drake Passage, dust deposition in the Scotia Sea and in Antarctica ice shelf, are consistent with a southward shift of the Southern Westerly Winds (SWW) during the AIM4. In contrast to other warmer AlMs, the SWW during the AIM4 did not migrate far enough south to generate upwelling in the Southern Ocean and they did not reach 52 S in SE Patagonia, as revealed by unchanged values of the rock-magnetic proxy of wind intensity obtained from the same PTA core. Nevertheless, the SWW displacement during AIM4 imposed drier conditions at 52 S in southeast Patagonia likely by blocking precipitation from the Atlantic Ocean, in a way similar to modem seasonal variations and the other Antarctic warm events. (C) 2017 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Antarctica Drake Passage Ice Shelf Scotia Sea Southern Ocean Université de Nantes: HAL-UNIV-NANTES Antarctic Argentine Drake Passage Lower Lake ENVELOPE(-129.290,-129.290,53.428,53.428) Patagonia Scotia Sea Southern Ocean Palaeogeography, Palaeoclimatology, Palaeoecology 472 33 50 |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Jouve, Guillaume Lise-Pronovost, Agathe Francus, Pierre de Coninck, Arnaud S. Team, Pasado Sci Climatic influence of the latest Antarctic isotope maximum of the last glacial period (AIM4) on Southern Patagonia |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience This paper presents the first detailed paleoclimate reconstruction of the latest Antarctic isotope maximum (AIM4, similar to 33-29 ka cal. BP) at 52 degrees S in continental southeastern Argentine Patagonia. High-resolution sedimentological and geochemical analyses of sediments from the maar lake Potrok Aike (PTA) reveal a decrease in the thickness of flood-induced turbidites and a series of wind burst deposits during AIM4, both pointing to increasingly drier conditions. This interpretation is also supported by a significant amount of runoff-driven micropumices incorporated within the sediments that suggests a lower lake level with canyons incising thick tephra deposits around the lake. Increased gustiness and/or dust availability in southeast Patagonia, together with intensified Antarctic circumpolar circulation in the Drake Passage, dust deposition in the Scotia Sea and in Antarctica ice shelf, are consistent with a southward shift of the Southern Westerly Winds (SWW) during the AIM4. In contrast to other warmer AlMs, the SWW during the AIM4 did not migrate far enough south to generate upwelling in the Southern Ocean and they did not reach 52 S in SE Patagonia, as revealed by unchanged values of the rock-magnetic proxy of wind intensity obtained from the same PTA core. Nevertheless, the SWW displacement during AIM4 imposed drier conditions at 52 S in southeast Patagonia likely by blocking precipitation from the Atlantic Ocean, in a way similar to modem seasonal variations and the other Antarctic warm events. (C) 2017 Elsevier B.V. All rights reserved. |
author2 |
Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) 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 |
Jouve, Guillaume Lise-Pronovost, Agathe Francus, Pierre de Coninck, Arnaud S. Team, Pasado Sci |
author_facet |
Jouve, Guillaume Lise-Pronovost, Agathe Francus, Pierre de Coninck, Arnaud S. Team, Pasado Sci |
author_sort |
Jouve, Guillaume |
title |
Climatic influence of the latest Antarctic isotope maximum of the last glacial period (AIM4) on Southern Patagonia |
title_short |
Climatic influence of the latest Antarctic isotope maximum of the last glacial period (AIM4) on Southern Patagonia |
title_full |
Climatic influence of the latest Antarctic isotope maximum of the last glacial period (AIM4) on Southern Patagonia |
title_fullStr |
Climatic influence of the latest Antarctic isotope maximum of the last glacial period (AIM4) on Southern Patagonia |
title_full_unstemmed |
Climatic influence of the latest Antarctic isotope maximum of the last glacial period (AIM4) on Southern Patagonia |
title_sort |
climatic influence of the latest antarctic isotope maximum of the last glacial period (aim4) on southern patagonia |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.science/hal-01765589 https://doi.org/10.1016/j.palaeo.2017.02.020 |
long_lat |
ENVELOPE(-129.290,-129.290,53.428,53.428) |
geographic |
Antarctic Argentine Drake Passage Lower Lake Patagonia Scotia Sea Southern Ocean |
geographic_facet |
Antarctic Argentine Drake Passage Lower Lake Patagonia Scotia Sea Southern Ocean |
genre |
Antarc* Antarctic Antarctica Drake Passage Ice Shelf Scotia Sea Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Drake Passage Ice Shelf Scotia Sea Southern Ocean |
op_source |
ISSN: 0031-0182 Palaeogeography, Palaeoclimatology, Palaeoecology https://hal.science/hal-01765589 Palaeogeography, Palaeoclimatology, Palaeoecology, 2017, 472, pp.33-50. ⟨10.1016/j.palaeo.2017.02.020⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.palaeo.2017.02.020 hal-01765589 https://hal.science/hal-01765589 doi:10.1016/j.palaeo.2017.02.020 |
op_doi |
https://doi.org/10.1016/j.palaeo.2017.02.020 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
472 |
container_start_page |
33 |
op_container_end_page |
50 |
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1766252333969178624 |