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| DOI | 10.1130/G25399A.1 | ||||
| Año | 2009 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
Resolving the timing, direction, and magnitude of paleoclimate changes in the southern midlatitudes is a prerequisite for determining the mechanisms underlying abrupt and widespread climate changes between the hemispheres during the Last Glacial-Interglacial transition (LGIT). This issue is still debated, with previous studies producing apparently discordant findings. Here we show evidence for a glacial readvance and a cold episode between ca. 14.8 and 12.6 ka in southwestern Patagonia (50 degrees S), contemporaneous with the Antarctic cold reversal. This was followed by ice recession under cold but relatively milder conditions until ca. 11.5 ka, when paleovegetation records indicate the onset of warm interglacial conditions. These findings differ from those reported in northern Patagonia (similar to 40 degrees S), where deteriorating conditions before 13.5 ka were followed by the coldest part of the LGIT that lasted until ca. 11.5 ka. We interpret the apparent blend of Greenlandic and Antarctic cold phases as evidence for their co-occurrence in the southern middle latitudes in Patagonia, and hypothesize that the position of the Antarctic Polar Front modulated the strength of these cold events in regions to the north or south of it.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | MORENO-MONCADA, PATRICIO IVAN | Hombre |
Universidad de Chile - Chile
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| 2 | Kaplan, Michael | Hombre |
Columbia Univ - Estados Unidos
Lamont-Doherty Earth Observatory - Estados Unidos |
| 3 | FRANCOIS-SEPULVEDA, JEAN PIERRE | Hombre |
Universidad de Chile - Chile
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| 4 | VILLA-MARTÍNEZ, RODRIGO | Hombre |
Centro de Estudios del Cuaternario Fuego-Patagonia y Antártica - Chile
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| 5 | Moy, Christopher M. | Hombre |
Universidad de Stanford - Estados Unidos
Stanford University - Estados Unidos |
| 6 | Stern, Charles | Hombre |
UNIV COLORADO - Estados Unidos
University of Colorado Boulder - Estados Unidos |
| 7 | Kubik, P. W. | - |
Swiss Fed Inst Technol - Suiza
ETH Zurich - Suiza |
| Fuente |
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| Comisión Nacional de Investigación Científica y Tecnológica (CONICYT) |
| Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT) |
| Institute of Ecology and Biodiversity |
| U. S. Department of Energy |
| Royal Society of London, and the Comer Science and Educational Foundation |
| Agradecimiento |
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| We thank E. Sagredo for field logistics and drafting Figure 1, J. Schaefer for laboratory facilities, and B. Goehring for assisting with probability plots. We thank Ejercito de Chile for support during field work. We acknowledge support from the Institute of Ecology and Biodiversity P05-002, contract PFB-23, Fondo Nacional de Desarrollo Cientifico y Tecnologico (Fondecyt) grant # 1070991 and grant # 1040204, Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT) grant ARTG04, the Royal Society of London, and the Comer Science and Educational Foundation. This is Lamont-Doherty Earth Observatory contribution 7217. Radiocarbon analyses were performed under the auspices of the U. S. Department of Energy by the University of California, Lawrence Livermore National Laboratory, under Contract No. W-7405-Eng-48. |