DOI: 10.1016/j.quascirev.2018.01.013
Scopus记录号: 2-s2.0-85041421026
论文题名: The MIS 3 maximum of the Torres del Paine and Última Esperanza ice lobes in Patagonia and the pacing of southern mountain glaciation
作者: García J.-L. ; Hein A.S. ; Binnie S.A. ; Gómez G.A. ; González M.A. ; Dunai T.J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 185 起始页码: 9
结束页码: 26
语种: 英语
Scopus关键词: Climate change
; Glaciers
; Ice
; Landforms
; Oceanography
; Salinity measurement
; Surface waters
; Last Glacial Maximum
; Last glacial period
; Marine isotope stages
; Mountain glaciers
; North Atlantic
; Northern Hemispheres
; Sea surface temperature (SST)
; Southern ocean
; Glacial geology
; climate variation
; glaciation
; ice sheet
; Last Glacial
; Last Glacial Maximum
; marine isotope stage
; moraine
; mountain region
; sea surface temperature
; westerly
; Atlantic Ocean
; Atlantic Ocean (North)
; Chile
; Magallanes
; Patagonia
; Southern Ocean
; Torres del Paine
; Ultima Esperanza
; Esperanza
英文摘要: The timing, structure and termination of the last southern mountain glaciation and its forcing remains unclear. Most studies have focused on the global Last Glacial Maximum (LGM; 26.5–19 ka) time period, which is just part of the extensive time-frame within the last glacial period, including Marine Isotope Stages 3 and 4. Understanding the glacial fluctuations throughout the glacial period is a prerequisite for uncovering the cause and climate mechanism driving southern glaciation and the interhemispheric linkages of climate change. Here, we present an extensive (n = 65) cosmogenic 10Be glacier chronology derived from moraine belts marking the pre-global LGM extent of the former Patagonian Ice Sheet in southernmost South America. Our results show the mountain ice sheet reached its maximum extent at 48.0 ± 1.8 ka during the local LGM, but attained just half this extent at 21.5 ± 1.8 ka during the global LGM. This finding, supported by nearby glacier chronologies, indicates that at orbital time scales, the southern mid-latitude glaciers fluctuated out-of-phase with northern hemisphere ice sheets. At millennial time-scales, our data suggest that Patagonian and New Zealand glaciers advanced in unison with cold Antarctic stadials and reductions in Southern Ocean sea surface temperatures. This implies a southern middle latitudes-wide millennial rhythm of climate change throughout the last glacial period linked to the north Atlantic by the bipolar seesaw. We suggest that winter insolation, acting alongside other drivers such as the strength and/or position of the southern westerlies, controlled the extents of major southern mountain glaciers such as those in southernmost South America. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112262
Appears in Collections: 气候减缓与适应
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作者单位: Instituto de Geografía, Facultad de Historia, Geografía y Ciencia Política, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Macul, Santiago, 782-0436, Chile; School of GeoSciences, University of Edinburgh, EdinburghScotland EH8 9XP, United Kingdom; Institut für Geologie und Mineralogie, Universität zu Köln, Zülpicher Str. 49b, Köln, 50674, Germany; Instituto de Ciencias de la Tierra, Universidad Austral de Chile, Valdivia, Chile
Recommended Citation:
García J.-L.,Hein A.S.,Binnie S.A.,et al. The MIS 3 maximum of the Torres del Paine and Última Esperanza ice lobes in Patagonia and the pacing of southern mountain glaciation[J]. Quaternary Science Reviews,2018-01-01,185