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| DOI | 10.1016/j.quascirev.2019.105976 |
| The last glacial termination in the Coyhaique sector of central Patagonia | |
| Vilanova I.; Moreno P.I.; Miranda C.G.; Villa-Martínez R.P. | |
| 发表日期 | 2019 |
| ISSN | 0277-3791 |
| 卷号 | 224 |
| 英文摘要 | Southern South America is the only continental landmass that intersects the core of the Southern Westerly Winds (SWW), and thus is important for studying their role as a driver/conduit for the initiation/propagation of climate signals since the last glaciation. Their interaction with the Southern Ocean (SO) affects global climate through its influence on high-latitude upwelling and biological productivity, deep-water convection sites and, consequently, ventilation of CO2 from the deep ocean. Variations in the SWW-SO coupled system have been postulated as fundamental drivers of climate change during glacial terminations and the current interglacial. Hence, deciphering the evolution of the SWW from sensitive locations in the southern middle latitudes is essential for understanding important climatic transitions during and since the Last Glacial Termination (T1). Terrestrial records from the central Patagonian Andes (CPA) (44°-49°S), however, show heterogeneities in the timing, rates, and direction of climate change during T1, impeding detailed assessment of its drivers at regional, hemispheric, and global scales. Here we present new data on glacier, vegetation, and fire-regime changes in the Coyhaique sector (45°34′S) of CPA to improve our understanding on the timing and structure of the T1, including the behavior of the SWW. Our results indicate glacial recession from the youngest Last Glacial Maximum moraines just before ∼17.9 ka and development of an ice-dammed proglacial lake during the early stages of T1. Drainage of the ice-dammed lake, triggered by renewed glacial recession, was near-synchronous with the onset of a gradual multi-millennial trend toward arboreal dominance that started at ∼16 ka east and west of the Andes at that latitude. We detect increased influence of the SWW at ∼45°S starting at ∼16.6 ka, relative to the first millennium of T1, that led to positive anomalies in precipitation between ∼16–14.4 and ∼12.8–11.5 ka, followed by negative anomalies between ∼11.5–9 ka. The synchronous spread of arboreal vegetation east and west of the CPA divide during T1, despite the trans-Andean precipitation contrasts, suggests an upward shift in the temperature-controlled Andean tree line, underscoring the role of deglacial warming as the critical driver for afforestation at regional scale. © 2019 Elsevier Ltd |
| 语种 | 英语 |
| scopus关键词 | Glacial geology; Lakes; Reforestation; Vegetation; Biological productivity; Continental landmass; Deep water convection; Glacial terminations; Last Glacial Maximum; Last glacial terminations; Southern south america; Southern westerly winds; Climate change; climate change; glacial-interglacial cycle; global climate; ice-dammed lake; Last Glacial; Last Glacial Maximum; precipitation (climatology); proglacial environment; treeline; upwelling; westerly; Aisen; Andes; Chile; Coihaique; Patagonia; Southern Ocean |
| 来源期刊 | Quaternary Science Reviews
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/151715 |
| 作者单位 | Museo Argentino de Ciencias Naturales Bernardino Rivadavia, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina; Millennium Nucleus Paleoclimate, Center for Climate Research and Resilience, Institute of Ecology and Biodiversity, Department of Ecological Sciences, Universidad de Chile, Santiago, Chile; Millennium Nucleus Paleoclimate, Institute of Ecology and Biodiversity, Centro de Investigación Gaia-Antártica, Universidad de Magallanes, Punta Arenas, Chile |
| 推荐引用方式 GB/T 7714 | Vilanova I.,Moreno P.I.,Miranda C.G.,et al. The last glacial termination in the Coyhaique sector of central Patagonia[J],2019,224. |
| APA | Vilanova I.,Moreno P.I.,Miranda C.G.,&Villa-Martínez R.P..(2019).The last glacial termination in the Coyhaique sector of central Patagonia.Quaternary Science Reviews,224. |
| MLA | Vilanova I.,et al."The last glacial termination in the Coyhaique sector of central Patagonia".Quaternary Science Reviews 224(2019). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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