Deglacial changes of the southern margin of the southern westerly winds revealed by terrestrial records from SW Patagonia (52°S)
Artículo de publicación ISI Much of the ongoing discussion regarding synchrony or bipolar asynchrony of paleoclimate events has centered on the timing and structure of the last glacial termination in the southern mid- latitudes, in particular the southwestern Patagonian region (50 e55 S). Its locati...
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ftunivchile:oai:repositorio.uchile.cl:2250/120056 2023-05-15T13:41:32+02:00 Deglacial changes of the southern margin of the southern westerly winds revealed by terrestrial records from SW Patagonia (52°S) Moreno Moncada, Patricio Villa Martínez, Rodrigo Cárdenas, M. L. Sagredo, E. A. 2012 application/pdf https://doi.org/10.1016/j.quascirev.2012.02.002 https://repositorio.uchile.cl/handle/2250/120056 en eng Elsevier Quaternary Science Reviews 41 (2012) 1-21 doi:10.1016/j.quascirev.2012.02.002 https://repositorio.uchile.cl/handle/2250/120056 Southwest Patagonia Artículo de revista 2012 ftunivchile https://doi.org/10.1016/j.quascirev.2012.02.002 2023-01-29T00:53:54Z Artículo de publicación ISI Much of the ongoing discussion regarding synchrony or bipolar asynchrony of paleoclimate events has centered on the timing and structure of the last glacial termination in the southern mid- latitudes, in particular the southwestern Patagonian region (50 e55 S). Its location adjacent to the Drake Passage and near the southern margin of the southern westerly winds (SWW) allows examining the postulated links between the Southern OceaneSWW coupled system and atmospheric CO2 variations through the last glacial termination. Results from two sites located in the Última Esperanza area (52 S) allow us to infer SWW-driven changes in hydrologic balance during this critical time interval. These findings indicate peatland development under temperate/wet conditions between 14,600 and 14,900 cal yr BP, followed by cooling and a lake transgressive phase that led to a shallow lake during the early part of the Antarctic Cold Reversal (ACR, 13,600e14,600 cal yr BP), followed in turn by a deeper lake and modest warming during Younger Dryas time (YD, w11,800e13,000 cal yr BP), superseded by terrestrialization and forest expansion at the beginning of the Holocene. We propose that the SWW (i) strengthened and shifted northward during ACR time causing a precipitation rise in northwestern and southwestern Patagonia coeval with mid- and high-latitude cooling and a halt in the deglacial atmospheric CO2 rise; (ii) shifted southward during YD time causing a precipitation decline/increase in NW/SW Patagonia, respectively, high-latitude warming, and invigorated CO2 release from the Southern Ocean; (iii) became weaker between w10,000 and 11,500 cal yr BP causing a precipitation decline throughout Patagonia, concurrent with peak mid- and high-latitude temperatures and atmospheric CO2 concentrations. This research was funded by Fondecyt grants 1040204, 1070991, 1110612, ICM grant P02-51, and PFB-23 from Conicyt. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Southern Ocean Universidad de Chile: Repositorio académico Antarctic Southern Ocean The Antarctic Patagonia Drake Passage Isi ENVELOPE(-38.550,-38.550,65.617,65.617) Esperanza ENVELOPE(-56.983,-56.983,-63.400,-63.400) Quaternary Science Reviews 41 1 21 |
institution |
Open Polar |
collection |
Universidad de Chile: Repositorio académico |
op_collection_id |
ftunivchile |
language |
English |
topic |
Southwest Patagonia |
spellingShingle |
Southwest Patagonia Moreno Moncada, Patricio Villa Martínez, Rodrigo Cárdenas, M. L. Sagredo, E. A. Deglacial changes of the southern margin of the southern westerly winds revealed by terrestrial records from SW Patagonia (52°S) |
topic_facet |
Southwest Patagonia |
description |
Artículo de publicación ISI Much of the ongoing discussion regarding synchrony or bipolar asynchrony of paleoclimate events has centered on the timing and structure of the last glacial termination in the southern mid- latitudes, in particular the southwestern Patagonian region (50 e55 S). Its location adjacent to the Drake Passage and near the southern margin of the southern westerly winds (SWW) allows examining the postulated links between the Southern OceaneSWW coupled system and atmospheric CO2 variations through the last glacial termination. Results from two sites located in the Última Esperanza area (52 S) allow us to infer SWW-driven changes in hydrologic balance during this critical time interval. These findings indicate peatland development under temperate/wet conditions between 14,600 and 14,900 cal yr BP, followed by cooling and a lake transgressive phase that led to a shallow lake during the early part of the Antarctic Cold Reversal (ACR, 13,600e14,600 cal yr BP), followed in turn by a deeper lake and modest warming during Younger Dryas time (YD, w11,800e13,000 cal yr BP), superseded by terrestrialization and forest expansion at the beginning of the Holocene. We propose that the SWW (i) strengthened and shifted northward during ACR time causing a precipitation rise in northwestern and southwestern Patagonia coeval with mid- and high-latitude cooling and a halt in the deglacial atmospheric CO2 rise; (ii) shifted southward during YD time causing a precipitation decline/increase in NW/SW Patagonia, respectively, high-latitude warming, and invigorated CO2 release from the Southern Ocean; (iii) became weaker between w10,000 and 11,500 cal yr BP causing a precipitation decline throughout Patagonia, concurrent with peak mid- and high-latitude temperatures and atmospheric CO2 concentrations. This research was funded by Fondecyt grants 1040204, 1070991, 1110612, ICM grant P02-51, and PFB-23 from Conicyt. |
format |
Article in Journal/Newspaper |
author |
Moreno Moncada, Patricio Villa Martínez, Rodrigo Cárdenas, M. L. Sagredo, E. A. |
author_facet |
Moreno Moncada, Patricio Villa Martínez, Rodrigo Cárdenas, M. L. Sagredo, E. A. |
author_sort |
Moreno Moncada, Patricio |
title |
Deglacial changes of the southern margin of the southern westerly winds revealed by terrestrial records from SW Patagonia (52°S) |
title_short |
Deglacial changes of the southern margin of the southern westerly winds revealed by terrestrial records from SW Patagonia (52°S) |
title_full |
Deglacial changes of the southern margin of the southern westerly winds revealed by terrestrial records from SW Patagonia (52°S) |
title_fullStr |
Deglacial changes of the southern margin of the southern westerly winds revealed by terrestrial records from SW Patagonia (52°S) |
title_full_unstemmed |
Deglacial changes of the southern margin of the southern westerly winds revealed by terrestrial records from SW Patagonia (52°S) |
title_sort |
deglacial changes of the southern margin of the southern westerly winds revealed by terrestrial records from sw patagonia (52°s) |
publisher |
Elsevier |
publishDate |
2012 |
url |
https://doi.org/10.1016/j.quascirev.2012.02.002 https://repositorio.uchile.cl/handle/2250/120056 |
long_lat |
ENVELOPE(-38.550,-38.550,65.617,65.617) ENVELOPE(-56.983,-56.983,-63.400,-63.400) |
geographic |
Antarctic Southern Ocean The Antarctic Patagonia Drake Passage Isi Esperanza |
geographic_facet |
Antarctic Southern Ocean The Antarctic Patagonia Drake Passage Isi Esperanza |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_relation |
Quaternary Science Reviews 41 (2012) 1-21 doi:10.1016/j.quascirev.2012.02.002 https://repositorio.uchile.cl/handle/2250/120056 |
op_doi |
https://doi.org/10.1016/j.quascirev.2012.02.002 |
container_title |
Quaternary Science Reviews |
container_volume |
41 |
container_start_page |
1 |
op_container_end_page |
21 |
_version_ |
1766151731724419072 |