Glacier fluctuations in the northern Patagonian Andes (44°S) imply wind-modulated interhemispheric in-phase climate shifts during Termination 1
The Last Glacial Termination (T1) featured major changes in global circulation systems that led to a shift from glacial to interglacial climate. While polar ice cores attest to an antiphased thermal pattern at millennial timescales, recent well-dated moraine records from both hemispheres suggest in-...
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2023
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Online Access: | https://repositorio.uc.cl/handle/11534/66970 https://doi.org/10.1038/s41598-022-14921-4 https://www.nature.com/articles/s41598-022-14921-4 |
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ftpunivcchile:oai:repositorio.uc.cl:11534/66970 2023-10-09T21:46:55+02:00 Glacier fluctuations in the northern Patagonian Andes (44°S) imply wind-modulated interhemispheric in-phase climate shifts during Termination 1 Soteres García, Rodrigo León Sagredo T., Esteban Kaplan, Michael R. Martini, Mateo A. Moreno, Patricio I. Reynhout, Scott A. Schwartz, Roseanne Schaefer, Joerg M.Soteres García, Rodrigo León Schaefer, Joerg M. 2023-05-12T15:36:58Z application/pdf https://repositorio.uc.cl/handle/11534/66970 https://doi.org/10.1038/s41598-022-14921-4 https://www.nature.com/articles/s41598-022-14921-4 en eng doi:10.1038/s41598-022-14921-4 2332-2675 https://doi.org/10.1038/s41598-022-14921-4 https://www.nature.com/articles/s41598-022-14921-4 https://repositorio.uc.cl/handle/11534/66970 acceso abierto Geomorphology Palaeoclimate 550 Ciencias de la tierra Artículo 2023 ftpunivcchile https://doi.org/10.1038/s41598-022-14921-4 2023-09-09T23:54:59Z The Last Glacial Termination (T1) featured major changes in global circulation systems that led to a shift from glacial to interglacial climate. While polar ice cores attest to an antiphased thermal pattern at millennial timescales, recent well-dated moraine records from both hemispheres suggest in-phase fluctuations in glaciers through T1, which is inconsistent with the bipolar see-saw paradigm. Here, we present a glacier chronology based on 30 new 10Be surface exposure ages from well-preserved moraines in the Lago Palena/General Vintter basin in northern Patagonia (~ 44°S). We find that the main glacier lobe underwent profound retreat after 19.7 ± 0.7 ka. This recessional trend led to the individualization of the Cerro Riñón glacier by ~ 16.3 ka, which underwent minor readvances at 15.9 ± 0.5 ka during Heinrich Stadial 1, during the Antarctic Cold Reversal with successive maxima at 13.5 ± 0.4, 13.1 ± 0.4, and 13.1 ± 0.5 ka, and a minor culmination at 12.5 ± 0.4 ka during Younger Dryas time. We conclude that fluctuations of Patagonian glaciers during T1 were controlled primarily by climate anomalies brought by shifts in the Southern Westerly Winds (SWW) locus. We posit that the global covariation of mountain glaciers during T1 was linked to variations in atmospheric CO2 (atmCO2) promoted by the interplay of the SWW-Southern Ocean system at millennial timescales. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Pontificia Universidad Católica de Chile: Repositorio UC Antarctic Southern Ocean The Antarctic Patagonia Scientific Reports 12 1 |
institution |
Open Polar |
collection |
Pontificia Universidad Católica de Chile: Repositorio UC |
op_collection_id |
ftpunivcchile |
language |
English |
topic |
Geomorphology Palaeoclimate 550 Ciencias de la tierra |
spellingShingle |
Geomorphology Palaeoclimate 550 Ciencias de la tierra Soteres García, Rodrigo León Sagredo T., Esteban Kaplan, Michael R. Martini, Mateo A. Moreno, Patricio I. Reynhout, Scott A. Schwartz, Roseanne Schaefer, Joerg M.Soteres García, Rodrigo León Schaefer, Joerg M. Glacier fluctuations in the northern Patagonian Andes (44°S) imply wind-modulated interhemispheric in-phase climate shifts during Termination 1 |
topic_facet |
Geomorphology Palaeoclimate 550 Ciencias de la tierra |
description |
The Last Glacial Termination (T1) featured major changes in global circulation systems that led to a shift from glacial to interglacial climate. While polar ice cores attest to an antiphased thermal pattern at millennial timescales, recent well-dated moraine records from both hemispheres suggest in-phase fluctuations in glaciers through T1, which is inconsistent with the bipolar see-saw paradigm. Here, we present a glacier chronology based on 30 new 10Be surface exposure ages from well-preserved moraines in the Lago Palena/General Vintter basin in northern Patagonia (~ 44°S). We find that the main glacier lobe underwent profound retreat after 19.7 ± 0.7 ka. This recessional trend led to the individualization of the Cerro Riñón glacier by ~ 16.3 ka, which underwent minor readvances at 15.9 ± 0.5 ka during Heinrich Stadial 1, during the Antarctic Cold Reversal with successive maxima at 13.5 ± 0.4, 13.1 ± 0.4, and 13.1 ± 0.5 ka, and a minor culmination at 12.5 ± 0.4 ka during Younger Dryas time. We conclude that fluctuations of Patagonian glaciers during T1 were controlled primarily by climate anomalies brought by shifts in the Southern Westerly Winds (SWW) locus. We posit that the global covariation of mountain glaciers during T1 was linked to variations in atmospheric CO2 (atmCO2) promoted by the interplay of the SWW-Southern Ocean system at millennial timescales. |
format |
Article in Journal/Newspaper |
author |
Soteres García, Rodrigo León Sagredo T., Esteban Kaplan, Michael R. Martini, Mateo A. Moreno, Patricio I. Reynhout, Scott A. Schwartz, Roseanne Schaefer, Joerg M.Soteres García, Rodrigo León Schaefer, Joerg M. |
author_facet |
Soteres García, Rodrigo León Sagredo T., Esteban Kaplan, Michael R. Martini, Mateo A. Moreno, Patricio I. Reynhout, Scott A. Schwartz, Roseanne Schaefer, Joerg M.Soteres García, Rodrigo León Schaefer, Joerg M. |
author_sort |
Soteres García, Rodrigo León |
title |
Glacier fluctuations in the northern Patagonian Andes (44°S) imply wind-modulated interhemispheric in-phase climate shifts during Termination 1 |
title_short |
Glacier fluctuations in the northern Patagonian Andes (44°S) imply wind-modulated interhemispheric in-phase climate shifts during Termination 1 |
title_full |
Glacier fluctuations in the northern Patagonian Andes (44°S) imply wind-modulated interhemispheric in-phase climate shifts during Termination 1 |
title_fullStr |
Glacier fluctuations in the northern Patagonian Andes (44°S) imply wind-modulated interhemispheric in-phase climate shifts during Termination 1 |
title_full_unstemmed |
Glacier fluctuations in the northern Patagonian Andes (44°S) imply wind-modulated interhemispheric in-phase climate shifts during Termination 1 |
title_sort |
glacier fluctuations in the northern patagonian andes (44°s) imply wind-modulated interhemispheric in-phase climate shifts during termination 1 |
publishDate |
2023 |
url |
https://repositorio.uc.cl/handle/11534/66970 https://doi.org/10.1038/s41598-022-14921-4 https://www.nature.com/articles/s41598-022-14921-4 |
geographic |
Antarctic Southern Ocean The Antarctic Patagonia |
geographic_facet |
Antarctic Southern Ocean The Antarctic Patagonia |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
doi:10.1038/s41598-022-14921-4 2332-2675 https://doi.org/10.1038/s41598-022-14921-4 https://www.nature.com/articles/s41598-022-14921-4 https://repositorio.uc.cl/handle/11534/66970 |
op_rights |
acceso abierto |
op_doi |
https://doi.org/10.1038/s41598-022-14921-4 |
container_title |
Scientific Reports |
container_volume |
12 |
container_issue |
1 |
_version_ |
1779309529570213888 |