Radiocarbon chronology of the last glacial maximum and its termination in northwestern Patagonia
Author
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Moreno Moncada, Patricio
Author
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Denton, George H.
Author
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Moreno, Hugo
Author
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Lowell, Thomas V.
Author
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Putnam, Aaron E.
Author
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Kaplan, Michael R.
Admission date
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2015-11-03T20:21:43Z
Available date
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2015-11-03T20:21:43Z
Publication date
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2015
Cita de ítem
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Quaternary Science Reviews 122 (2015) 233-249
en_US
Identifier
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DOI: 10.1016/j.quascirev.2015.05.027
Identifier
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https://repositorio.uchile.cl/handle/2250/134818
General note
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Artículo de publicación ISI
en_US
Abstract
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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.