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| DOI | 10.1016/j.quascirev.2020.106328 |
| Timing and structure of vegetation; fire; and climate changes on the Pacific slope of northwestern Patagonia since the last glacial termination | |
| Moreno P.I. | |
| 发表日期 | 2020 |
| ISSN | 0277-3791 |
| 卷号 | 238 |
| 英文摘要 | By virtue of its location in the southern mid-latitudes, northwestern Patagonia (40°-44°S) offers the opportunity to unravel the mechanisms involved in the initiation and propagation of paleoclimate signals of hemispheric and global significance. Of particular importance is deciphering the evolution of the Southern Westerly Winds (SWW) considering their influence at continental, zonal, hemispheric, and global scale. Here I present a multi-decadal record from Lago Proschle, a small closed-basin lake located on the Pacific slope of northwestern Patagonia, to examine the timing and structure of vegetation, fire, and climate change along a continuum since the onset of the Last Glacial Termination (T1). The record shows rapid glacier recession during T1, reaching the western Andean foothills in ∼400 years or less. Nothofagus-dominated forests established between ∼17.4–17 ka, followed by closed-canopy North Patagonian Rain Forests (NPRF) with shade-tolerant thermophilous trees between ∼16.3–15.4 ka. These changes suggest an abrupt warming trend and an increase in precipitation at ∼16.3 ka, associated with a northward shift of the SWW. Subsequent increases in cold-tolerant hygrophilous trees between ∼15.4–12.8 ka imply a shift to cold, more humid conditions during the Antarctic Cold Reversal, suggesting stronger SWW influence. This was followed by stand-replacing fires brought by a sudden decline in summer precipitation at ∼12.8 ka, associated with a millennial-scale southward shift of the SWW which was contemporaneous with the onset of the Younger Dryas. Dominance of thermophilous, summer-drought tolerant Valdivian rainforest trees and high fire activity ensued between ∼10.3–7.8 ka, suggesting peak warmth and overall decline in annual precipitation associated with weakening of the SWW during the early Holocene. A multi-millennial cooling and wetting trend started at ∼7.8 ka, brought by stronger SWW influence, followed by recurrent, centennial-scale variations in temperature and precipitation starting at ∼6.4 ka. Deforestation, fire, and spread of non-native herbs by Chilean/European settlers began during the late 18th century. Abrupt vegetation changes in the Lago Proschle record were driven by rapid climate changes over the last 17,400 years amplified, in some instances, by fire disturbance. © 2020 Elsevier Ltd |
| 语种 | 英语 |
| scopus关键词 | Deforestation; Fires; Glacial geology; Timing circuits; Vegetation; Annual precipitation; Antarctic cold reversals; Initiation and propagation; Last glacial terminations; Rapid climate change; Southern westerly winds; Stand-replacing fires; Summer precipitation; Climate change; climate change; Holocene; Last Glacial Maximum; midlatitude environment; paleoclimate; precipitation (climatology); rainforest; slope; temperature tolerance; vegetation structure; Younger Dryas; Andes; Pacific Ocean; Patagonia; Nothofagus |
| 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/151463 |
| 作者单位 | Millennium Nucleus Paleoclimate, Center for Climate Research and Resilience, Institute of Ecology and Biodiversity, Department of Ecological Sciences, Universidad de Chile, Santiago, Chile |
| 推荐引用方式 GB/T 7714 | Moreno P.I.. Timing and structure of vegetation; fire; and climate changes on the Pacific slope of northwestern Patagonia since the last glacial termination[J],2020,238. |
| APA | Moreno P.I..(2020).Timing and structure of vegetation; fire; and climate changes on the Pacific slope of northwestern Patagonia since the last glacial termination.Quaternary Science Reviews,238. |
| MLA | Moreno P.I.."Timing and structure of vegetation; fire; and climate changes on the Pacific slope of northwestern Patagonia since the last glacial termination".Quaternary Science Reviews 238(2020). |
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