DOI: 10.1016/j.quascirev.2019.106131
论文题名: Late glacial and Holocene climate variability, southernmost Patagonia
作者: McCulloch R.D. ; Blaikie J. ; Jacob B. ; Mansilla C.A. ; Morello F. ; De Pol-Holz R. ; San Román M. ; Tisdall E. ; Torres J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2020
卷: 229 语种: 英语
英文关键词: Holocene
; Palaeogeography
; Pollen analysis
; Pollen preservation
; Rapid climate change
; South America
; Southern westerly winds
; Vegetation dynamics
Scopus关键词: Driers (materials)
; Global warming
; Vegetation
; Holocenes
; Palaeogeography
; Pollen analysis
; Rapid climate change
; South America
; Southern westerly winds
; Vegetation dynamics
; Glacial geology
; climate change
; climate variation
; global warming
; Holocene
; landscape
; late glacial
; latitudinal gradient
; paleoecology
; paleogeography
; palynology
; peatland
; Postglacial
; precipitation (climatology)
; proxy climate record
; vegetation dynamics
; vegetation type
; westerly
; woodland
; Magallanes
; Navarino Island
; Patagonia
; Tierra del Fuego [(ISG) South America]
; Nothofagus
英文摘要: A Late glacial – Holocene palaeoecological record, constrained by a robust chronology, from a peat bog near Punta Burslem (54°54′S, 67°57′W) on Isla Navarino, southernmost Patagonia documents the shifts in intensity and focus of the Southern Westerly Winds (SWWs) at these high latitudes. Such long-term records are required to reconstruct and better understand the likely regional impacts of a poleward shift and intensification of the SWWs predicted under global warming scenarios. Deglaciation at Punta Burslem occurs sometime before c. 17,000 cal a BP, and the post glacial landscape is dominated by cold tolerant pioneer species. Nothofagus woodland is established by c. 12,250 cal a BP, this moisture sensitive vegetation type retreats in the early to mid-Holocene from c. 9700 to 7050 cal a BP reflecting an intense and sustained drier phase associated with a prolonged poleward contraction of the SWWs. After c. 6000 cal a BP there is a regional trend to cooler and wetter climate. However, we identify at least five periods of rapid climate change (RCC) leading to drier conditions at this southern extreme of Patagonia: c. 5350-4750 cal a BP, c.4300-3300 cal a BP, c. 2600-1850 cal a BP, c. 1350-1100 cal a BP and c. 550-350 cal a BP. From a synthesis of our Isla Navarino records and a latitudinal spread (34°-64°S) of multiproxy records it is proposed that these periods of RCC and relatively drier conditions indicate latitudinal shifts in the location and intensity of the SWWs in response to climatic warming leading to reduced precipitation at the southern margins of Patagonia. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159605
Appears in Collections: 气候变化与战略
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作者单位: Centro de Investigación de Ecosistemas de la Patagonia (CIEP), Coyhaique, Chile; School of GeoSciences, The University of Edinburgh, Edinburgh, Scotland, United Kingdom; Biological & Environmental Sciences, University of Stirling, Stirling, Scotland, United Kingdom; Centro de Investigación Gaia Antártica (CIGA), Universidad de Magallanes, Punta Arenas, Chile; Centro de Estudios del Hombre Austral (CEHA), Instituto de la Patagonia, Universidad de Magallanes, Punta Arenas, Chile
Recommended Citation:
McCulloch R.D.,Blaikie J.,Jacob B.,et al. Late glacial and Holocene climate variability, southernmost Patagonia[J]. Quaternary Science Reviews,2020-01-01,229