DOI: 10.1016/j.quascirev.2018.01.011
Scopus记录号: 2-s2.0-85044596289
论文题名: Trans-pacific glacial response to the Antarctic Cold Reversal in the southern mid-latitudes
作者: Sagredo E.A. ; Kaplan M.R. ; Araya P.S. ; Lowell T.V. ; Aravena J.C. ; Moreno P.I. ; Kelly M.A. ; Schaefer J.M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 188 起始页码: 160
结束页码: 166
语种: 英语
英文关键词: Antarctic Cold Reversal
; Glacier fluctuation
; Late glacial
; Monte San Lorenzo
; Patagonia
; Southern westerly winds
Scopus关键词: Glacial geology
; Repair
; Antarctic cold reversals
; Glacier fluctuations
; Late glacial
; Monte San Lorenzo
; Patagonia
; Southern westerly winds
; Climate change
; climate variation
; cooling
; equilibrium line
; glacier advance
; glacier dynamics
; Last Glacial-Interglacial
; late glacial
; latitude
; moraine
; Southern Hemisphere
; westerly
; Antarctica
; Monte San Lorenzo
; New Zealand
; Pacific Ocean
; Patagonia
英文摘要: Elucidating the timing and regional extent of abrupt climate events during the last glacial-interglacial transition (∼18–11.5 ka) is critical for identifying spatial patterns and mechanisms responsible for large-magnitude climate events. The record of climate change in the Southern Hemisphere during this time period, however, remains scarce and unevenly distributed. We present new geomorphic, chronological, and equilibrium line altitude (ELA) data from a climatically sensitive mountain glacier at Monte San Lorenzo (47°S), Central Patagonia. Twenty-four new cosmogenic 10Be exposure ages from moraines provide a comprehensive glacial record in the mid-latitudes of South America, which constrain the timing, spatial extent and magnitude of glacial fluctuations during the Antarctic Cold Reversal (ACR, ∼14.5–12.9 ka). Río Tranquilo glacier advanced and reached a maximum extent at 13.9 ± 0.7 ka. Three additional inboard moraines afford statistically similar ages, indicating repeated glacier expansions or marginal fluctuations over the ACR. Our record represents the northernmost robust evidence of glacial fluctuations during the ACR in southern South America, documenting not only the timing of the ACR maximum, but also the sequence of glacier changes within this climate event. Based on ELA reconstructions, we estimate a cooling of >1.6–1.8 °C at the peak of the ACR. The Río Tranquilo record along with existing glacial reconstructions from New Zealand (43°S) and paleovegetation records from northwestern (41°S) and central-west (45°S) Patagonia, suggest an uniform trans-Pacific glacier-climate response to an ACR trigger across the southern mid-latitudes. We posit that the equatorial migration of the southern westerly winds provides an adequate mechanism to propagate a common ACR signal across the Southern Hemisphere. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112211
Appears in Collections: 气候减缓与适应
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作者单位: Instituto de Geografía, Pontificia Universidad Católica de Chile, Santiago, Chile; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10944, United States; Geology Department, University of Cincinnati, Cincinnati, OH 45221, United States; Gaia-Antártica, Universidad de Magallanes, Punta Arenas, Chile; Instituto de Ecología y Biodiversidad, Departamento de Ciencias Ecológicas, Universidad de Chile, Santiago, Chile; Department of Earth Sciences, Dartmouth College, Hanover, NH 03755, United States; Department of Earth and Environmental Sciences of Columbia University, New York, NY 10027, United States
Recommended Citation:
Sagredo E.A.,Kaplan M.R.,Araya P.S.,et al. Trans-pacific glacial response to the Antarctic Cold Reversal in the southern mid-latitudes[J]. Quaternary Science Reviews,2018-01-01,188