Climatic influence of the latest Antarctic isotope maximum of the last glacial period (AIM4) on Southern Patagonia
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 Po...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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Online Access: | https://archimer.ifremer.fr/doc/00420/53164/83103.pdf https://doi.org/10.1016/j.palaeo.2017.02.020 https://archimer.ifremer.fr/doc/00420/53164/ |
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ftarchimer:oai:archimer.ifremer.fr:53164 2023-05-15T13:50:50+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. Pasado Science Team 2017-04-15 application/pdf https://archimer.ifremer.fr/doc/00420/53164/83103.pdf https://doi.org/10.1016/j.palaeo.2017.02.020 https://archimer.ifremer.fr/doc/00420/53164/ eng eng Elsevier Science Bv https://archimer.ifremer.fr/doc/00420/53164/83103.pdf doi:10.1016/j.palaeo.2017.02.020 https://archimer.ifremer.fr/doc/00420/53164/ 2017 Elsevier B.V. All rights reserved. info:eu-repo/semantics/openAccess restricted use Palaeogeography Palaeoclimatology Palaeoecology (0031-0182) (Elsevier Science Bv), 2017-04-15 , Vol. 472 , P. 33-50 Southern Westerly Winds Micro X-ray fluorescence Microfacies Micropumices Dust Flood text Publication info:eu-repo/semantics/article 2017 ftarchimer https://doi.org/10.1016/j.palaeo.2017.02.020 2021-09-23T20:30:24Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica Drake Passage Ice Shelf Scotia Sea Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) 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 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Southern Westerly Winds Micro X-ray fluorescence Microfacies Micropumices Dust Flood |
spellingShingle |
Southern Westerly Winds Micro X-ray fluorescence Microfacies Micropumices Dust Flood Jouve, Guillaume Lise-pronovost, Agathe Francus, Pierre De Coninck, Arnaud S. Pasado Science Team Climatic influence of the latest Antarctic isotope maximum of the last glacial period (AIM4) on Southern Patagonia |
topic_facet |
Southern Westerly Winds Micro X-ray fluorescence Microfacies Micropumices Dust Flood |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Jouve, Guillaume Lise-pronovost, Agathe Francus, Pierre De Coninck, Arnaud S. Pasado Science Team |
author_facet |
Jouve, Guillaume Lise-pronovost, Agathe Francus, Pierre De Coninck, Arnaud S. Pasado Science Team |
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 |
Elsevier Science Bv |
publishDate |
2017 |
url |
https://archimer.ifremer.fr/doc/00420/53164/83103.pdf https://doi.org/10.1016/j.palaeo.2017.02.020 https://archimer.ifremer.fr/doc/00420/53164/ |
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 |
Palaeogeography Palaeoclimatology Palaeoecology (0031-0182) (Elsevier Science Bv), 2017-04-15 , Vol. 472 , P. 33-50 |
op_relation |
https://archimer.ifremer.fr/doc/00420/53164/83103.pdf doi:10.1016/j.palaeo.2017.02.020 https://archimer.ifremer.fr/doc/00420/53164/ |
op_rights |
2017 Elsevier B.V. All rights reserved. info:eu-repo/semantics/openAccess restricted use |
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 |
_version_ |
1766254162702499840 |