Radiocarbon chronology of the last glacial maximum and its termination in northwestern Patagonia
Artículo de publicación ISI We examine the timing and magnitude of the last glacial maximum (LGM) and the last glacial termination (LGT) in northwestern Patagonia, situated in the middle latitudes of South America. Our data indicate that the main phase of the LGT began with abrupt warm pulses at 17,...
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ftunivchile:oai:repositorio.uchile.cl:2250/134818 2023-05-15T17:31:33+02:00 Radiocarbon chronology of the last glacial maximum and its termination in northwestern Patagonia Moreno Moncada, Patricio Denton, George H. Moreno, Hugo Lowell, Thomas V. Putnam, Aaron E. Kaplan, Michael R. 2015 application/pdf https://doi.org/10.1016/j.quascirev.2015.05.027 https://repositorio.uchile.cl/handle/2250/134818 en eng Elsevier Quaternary Science Reviews 122 (2015) 233-249 doi:10.1016/j.quascirev.2015.05.027 https://repositorio.uchile.cl/handle/2250/134818 Atribución-NoComercial-SinDerivadas 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ CC-BY-NC-ND Nothofagus rise North Patagonian rainforests Llanquihue moraines Lic an ignimbrite Northwestern Patagonia Southern mid-latitudes Last glacial maximum Last glacial termination Heinrich Stadial 1 Artículo de revista 2015 ftunivchile https://doi.org/10.1016/j.quascirev.2015.05.027 2023-01-29T00:51:49Z Artículo de publicación ISI We examine the timing and magnitude of the last glacial maximum (LGM) and the last glacial termination (LGT) in northwestern Patagonia, situated in the middle latitudes of South America. Our data indicate that the main phase of the LGT began with abrupt warm pulses at 17,800 and 17,100 cal yrs BP, accompanied by rapid establishment of evergreen temperate rainforests and extensive deglaciation of the Andes within 1000 years. This response shows that South American middle-latitude temperatures had approached average interglacial values by 16,800 cal yrs BR The temperature rise in northwestern Patagonia coincides with the beginning of major warming and glacier recession in the Southern Alps of New Zealand at southern mid-latitudes on the opposite side of the Pacific Ocean. From this correspondence, the warming that began at 17,800 cal yrs BP appears to have been widespread in middle latitudes of the Southern Hemisphere, accounting for at least 75% of the total temperature recovery from the LGM to the Holocene. Moreover, this warming pulse is coeval with the first half of the Heinrich Stadial 1 (HS1) in the North Atlantic region. HS1 featured a decline of North Atlantic meridional overturning circulation, a southward shift of the westerly wind belt in both hemispheres and of the Inter-tropical Convergence Zone, as well as a weakening of the Asian monsoon. Along with the initiating trigger, identifying the mechanisms whereby these opposing climate signals in the two polar hemispheres interacted whether through an oceanic or an atmospheric bipolar seesaw, or both-lies at the heart of understanding the LGT. Fondecyt 1110612 1131055 ICM P05-002 NC120066 Fondap 15110009 Article in Journal/Newspaper North Atlantic Universidad de Chile: Repositorio académico Isi ENVELOPE(-38.550,-38.550,65.617,65.617) Llanquihue ENVELOPE(-65.083,-65.083,-65.550,-65.550) New Zealand Pacific Patagonia Quaternary Science Reviews 122 233 249 |
institution |
Open Polar |
collection |
Universidad de Chile: Repositorio académico |
op_collection_id |
ftunivchile |
language |
English |
topic |
Nothofagus rise North Patagonian rainforests Llanquihue moraines Lic an ignimbrite Northwestern Patagonia Southern mid-latitudes Last glacial maximum Last glacial termination Heinrich Stadial 1 |
spellingShingle |
Nothofagus rise North Patagonian rainforests Llanquihue moraines Lic an ignimbrite Northwestern Patagonia Southern mid-latitudes Last glacial maximum Last glacial termination Heinrich Stadial 1 Moreno Moncada, Patricio Denton, George H. Moreno, Hugo Lowell, Thomas V. Putnam, Aaron E. Kaplan, Michael R. Radiocarbon chronology of the last glacial maximum and its termination in northwestern Patagonia |
topic_facet |
Nothofagus rise North Patagonian rainforests Llanquihue moraines Lic an ignimbrite Northwestern Patagonia Southern mid-latitudes Last glacial maximum Last glacial termination Heinrich Stadial 1 |
description |
Artículo de publicación ISI We examine the timing and magnitude of the last glacial maximum (LGM) and the last glacial termination (LGT) in northwestern Patagonia, situated in the middle latitudes of South America. Our data indicate that the main phase of the LGT began with abrupt warm pulses at 17,800 and 17,100 cal yrs BP, accompanied by rapid establishment of evergreen temperate rainforests and extensive deglaciation of the Andes within 1000 years. This response shows that South American middle-latitude temperatures had approached average interglacial values by 16,800 cal yrs BR The temperature rise in northwestern Patagonia coincides with the beginning of major warming and glacier recession in the Southern Alps of New Zealand at southern mid-latitudes on the opposite side of the Pacific Ocean. From this correspondence, the warming that began at 17,800 cal yrs BP appears to have been widespread in middle latitudes of the Southern Hemisphere, accounting for at least 75% of the total temperature recovery from the LGM to the Holocene. Moreover, this warming pulse is coeval with the first half of the Heinrich Stadial 1 (HS1) in the North Atlantic region. HS1 featured a decline of North Atlantic meridional overturning circulation, a southward shift of the westerly wind belt in both hemispheres and of the Inter-tropical Convergence Zone, as well as a weakening of the Asian monsoon. Along with the initiating trigger, identifying the mechanisms whereby these opposing climate signals in the two polar hemispheres interacted whether through an oceanic or an atmospheric bipolar seesaw, or both-lies at the heart of understanding the LGT. Fondecyt 1110612 1131055 ICM P05-002 NC120066 Fondap 15110009 |
format |
Article in Journal/Newspaper |
author |
Moreno Moncada, Patricio Denton, George H. Moreno, Hugo Lowell, Thomas V. Putnam, Aaron E. Kaplan, Michael R. |
author_facet |
Moreno Moncada, Patricio Denton, George H. Moreno, Hugo Lowell, Thomas V. Putnam, Aaron E. Kaplan, Michael R. |
author_sort |
Moreno Moncada, Patricio |
title |
Radiocarbon chronology of the last glacial maximum and its termination in northwestern Patagonia |
title_short |
Radiocarbon chronology of the last glacial maximum and its termination in northwestern Patagonia |
title_full |
Radiocarbon chronology of the last glacial maximum and its termination in northwestern Patagonia |
title_fullStr |
Radiocarbon chronology of the last glacial maximum and its termination in northwestern Patagonia |
title_full_unstemmed |
Radiocarbon chronology of the last glacial maximum and its termination in northwestern Patagonia |
title_sort |
radiocarbon chronology of the last glacial maximum and its termination in northwestern patagonia |
publisher |
Elsevier |
publishDate |
2015 |
url |
https://doi.org/10.1016/j.quascirev.2015.05.027 https://repositorio.uchile.cl/handle/2250/134818 |
long_lat |
ENVELOPE(-38.550,-38.550,65.617,65.617) ENVELOPE(-65.083,-65.083,-65.550,-65.550) |
geographic |
Isi Llanquihue New Zealand Pacific Patagonia |
geographic_facet |
Isi Llanquihue New Zealand Pacific Patagonia |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Quaternary Science Reviews 122 (2015) 233-249 doi:10.1016/j.quascirev.2015.05.027 https://repositorio.uchile.cl/handle/2250/134818 |
op_rights |
Atribución-NoComercial-SinDerivadas 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.quascirev.2015.05.027 |
container_title |
Quaternary Science Reviews |
container_volume |
122 |
container_start_page |
233 |
op_container_end_page |
249 |
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1766129197106855936 |