DOI: 10.1016/j.quascirev.2016.03.014
Scopus记录号: 2-s2.0-84963984605
论文题名: Patagonian and southern South Atlantic view of Holocene climate
作者: Kaplan M.R. ; Schaefer J.M. ; Strelin J.A. ; Denton G.H. ; Anderson R.F. ; Vandergoes M.J. ; Finkel R.C. ; Schwartz R. ; Travis S.G. ; Garcia J.L. ; Martini M.A. ; Nielsen S.H.H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 141 起始页码: 112
结束页码: 125
语种: 英语
英文关键词: Cosmogenic dating
; Holocene
; Paleoclimate
; Patagonia
; South Atlantic Ocean
Scopus关键词: Climate change
; Sea ice
; Cosmogenic dating
; Holocenes
; Paleoclimates
; Patagonia
; South Atlantic
; Ice
; cosmogenic radionuclide
; geological record
; glacier dynamics
; Holocene
; ice cover
; moraine
; Northern Hemisphere
; paleoclimate
; sea ice
; Southern Hemisphere
; westerly
; Argentina
; Argentino Lake
; Atlantic Ocean
; Atlantic Ocean (South)
; Patagonia
; Santa Cruz [Argentina]
; Sweden
; Uppsala [Sweden]
; Uppsala [Uppsala (CNT)]
英文摘要: We present a comprehensive 10Be chronology for Holocene moraines in the Lago Argentino basin, on the east side of the South Patagonian Icefield. We focus on three different areas, where prior studies show ample glacier moraine records exist because they were formed by outlet glaciers sensitive to climate change. The 10Be dated records are from the Lago Pearson, Herminita Península-Brazo Upsala, and Lago Frías areas, which span a distance of almost 100 km adjacent to the modern Icefield. New 10Be ages show that expanded glaciers and moraine building events occurred at least at 6120 ± 390 (n = 13), 4450 ± 220 (n = 7), 1450 or 1410 ± 110 (n = 18), 360 ± 30 (n = 5), and 240 ± 20 (n = 8) years ago. Furthermore, other less well-dated glacier expansions of the Upsala Glacier occurred between ~1400 and ~1000 and ~2300 and ~2000 years ago. The most extensive glaciers occurred over the interval from ~6100 to ~4500 years ago, and their margins over the last ~600 years were well within and lower than those in the middle Holocene. The 10Be ages agree with 14C-limiting data for the glacier histories in this area.We then link southern South American, adjacent South Atlantic, and other Southern Hemisphere records to elucidate broader regional patterns of climate and their possible causes. In the early Holocene, a far southward position of the westerly winds fostered warmth, small Patagonian glaciers, and reduced sea ice coverage over the South Atlantic. Although we infer a pronounced southward displacement of the westerlies during the early Holocene, these conditions did not occur throughout the southern mid-high latitudes, an important exception being over the southwest Pacific sector. Subsequently, a northward locus and/or expansion of the winds over the Patagonia-South Atlantic sector promoted the largest glaciers between ~6100 and ~4500 years ago and greatest sea ice coverage. Over the last few millennia, the South Patagonian Icefield has experienced successive century-scale advances superimposed on a long-term net decrease in size. Our findings indicate that glaciers and sea ice in the Patagonian-South Atlantic sector of the Southern Hemisphere did not achieve their largest Holocene extents over the last millennium. We conclude that a pattern of more extensive Holocene ice prior to the last millennium is characteristic of the Southern Hemisphere middle latitudes, which differs from the glacier history traditionally thought for the Northern Hemisphere. © 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59597
Appears in Collections: 过去全球变化的重建
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作者单位: Geochemistry, Lamont-Doherty Earth Observatory, Palisades, NY, United States; Department of Earth and Environmental Sciences, Columbia University, New York, NY, United States; Instituto Antártico Argentino (IAA), Argentina; Centro de Investigaciones en Ciencias de la Tierra (CONICET-UNC), Córdoba, Argentina; School of Earth and Climate Sciences and Climate Change Institute, University of Maine, Orono, ME, United States; GNS Science, Lower Hutt, New Zealand; Dept. of Earth and Planetary Sciences, University of California, Berkeley, CA, United States; GCI, Soldiers Grove, WI, United States; Instituto de Geografía, Facultad de Historia, Geografía y Ciencia Política, Pontificia Universidad Católica de Chile, Chile; Kenex Ltd, New Zealand
Recommended Citation:
Kaplan M.R.,Schaefer J.M.,Strelin J.A.,et al. Patagonian and southern South Atlantic view of Holocene climate[J]. Quaternary Science Reviews,2016-01-01,141