DOI: 10.1016/j.quascirev.2016.08.008
Scopus记录号: 2-s2.0-84981316067
论文题名: Centennial and millennial-scale hydroclimate changes in northwestern Patagonia since 16,000 yr BP
作者: Moreno P.I. ; Videla J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 149 起始页码: 326
结束页码: 337
语种: 英语
英文关键词: Antarctic Cold Reversal
; Centennial/millennial-scale climate variability
; Holocene
; Northwestern Patagonia
; Southern westerly winds
Scopus关键词: Biodiversity
; Charcoal
; Lakes
; Antarctic cold reversals
; Climate variability
; Holocenes
; Patagonia
; Southern westerly winds
; Climate change
; climate change
; fire history
; historical record
; Holocene
; Medieval
; paleoclimate
; paleoecology
; precipitation (climatology)
; rainforest
; seasonal variation
; seasonality
; temperate forest
; Younger Dryas
; Cumbria
; Durango [Mexico]
; El Salto
; England
; Lake District
; Mexico [North America]
; Patagonia
; United Kingdom
英文摘要: We examine hydroclimate changes at centennial/millennial timescales since 16,000 yr BP in northwestern Patagonia based on the pollen and charcoal record from Lago El Salto, a small closed-basin lake located in the Chilean Lake District (41°38′48.02″S, 73° 5′48.42″W). We observe cold/wet conditions between 14,500–16,000 yr BP, followed by further cooling with increased precipitation until 13,000 yr BP, enhanced precipitation seasonality and/or variability between 11,600–13,000 yr BP, and an extended warm-and-dry interval between 7600 and 11,300 yr BP with peak paleofire activity. Colder-and-wetter than present conditions and muted paleofire activity prevail between 5300 and 7600 yr BP, followed by alternating cold/wet and centennial-scale warm/dry phases starting at 5300 yr BP with three conspicuous megadroughts since 2500 yr BP. The most recent megadrought occurred during the Medieval Climate Anomaly. We identify a cold reversal that spans the Antarctic Cold Reversal (ACR) and the Younger Dryas (YD) chrons with stronger-than-present westerly influence during the former and enhanced variability during the latter. These results extend the northern limit of strong cooling and increase in precipitation during the ACR and the southern limit of influence of strong hydrologic variations during the YD in terrestrial environments, suggesting an overlap in the spheres of influence of processes originating from southern and northern polar latitudes. An extended warm southern westerly wind (SWW)-minimum interval is evident between 7600 and 11,300 yr BP, followed by a rapid shift to cool-moist conditions between 5300 and 7600 yr BP brought by a mid-Holocene SWW maximum. Since then we observe centennial-scale hydroclimate variability, which has driven biodiversity and fire-regime shifts of evergreen temperate rainforests. © 2016 Elsevier Ltd 资助项目: This study was supported by ICM grants P05-002 and NC120066, FONDECYT and 1131055, Fondap and CONICYT PFB-23. We thank G.H. Denton, T.V. Lowell, and G.L. Jacobson for their help during fieldwork and for supporting the early stages of this study. We also thank C. Whitlock for providing the
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59456
Appears in Collections: 过去全球变化的重建
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作者单位: Instituto de Ecología y Biodiversidad y Departamento de Ciencias Ecológicas, Universidad de Chile, Chile
Recommended Citation:
Moreno P.I.,Videla J.. Centennial and millennial-scale hydroclimate changes in northwestern Patagonia since 16,000 yr BP[J]. Quaternary Science Reviews,2016-01-01,149