DOI: 10.1016/j.epsl.2020.116077
论文题名: Holocene glacier behavior around the northern Antarctic Peninsula and possible causes
作者: Kaplan M.R. ; Strelin J.A. ; Schaefer J.M. ; Peltier C. ; Martini M.A. ; Flores E. ; Winckler G. ; Schwartz R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 534 语种: 英语
中文关键词: Antarctic Peninsula
; Antarctica
; cosmogenic dating
; deglaciation
; Holocene
; paleoclimate
英文关键词: Climate change
; Expansion
; Sea ice
; Vortex flow
; Antarctic Peninsula
; Antarctica
; Cosmogenic dating
; Deglaciations
; Holocenes
; Paleoclimates
; Landforms
; climate variation
; cosmogenic radionuclide
; deglaciation
; glacier dynamics
; Holocene
; ice sheet
; paleoclimate
; radiocarbon dating
; sea ice
; Antarctic Ice Sheet
; Antarctic Peninsula
; Antarctica
; West Antarctica
英文摘要: We obtained 49 new 10Be ages that document the activity of the former Northern Antarctic Peninsula Ice Sheet, and subsequently the James Ross Island Ice Cap and nearby glaciers, from the end of the last glacial period until the last ∼100 years. The data indicate that from >11 to ∼8 ka marked recession of glacier systems occurred around James Ross Island, including tidewater and local land-terminating glaciers. Glaciers reached heads of bays and fjords by 8-7 ka. Subsequently, local glaciers were larger than present around (at least) 7.5-7 ka and ∼5-4 ka, at times between 3.9 and 3.6 ka and just after 3 ka, between ∼2.4 and ∼1 ka, and from ∼300 to ∼100 years ago. After deglaciation, the largest local glacier extents occurred between ∼7 ka and ∼4 ka. Comparison with other paleoclimate records, including of sea ice extent, reveals coherent climate changes over ∼15° of latitude. In the early Holocene, most of the time a swath of warmth spanned from southern South America to the Antarctic Peninsula sector. We infer such intervals are times of weakening and/or poleward expansion of the band of stronger westerlies, associated with contraction of the polar vortex. Conversely, increased sea ice and equatorward expansion of the westerlies and the polar vortex favor larger glaciers from Patagonia to the Antarctic Peninsula, which typically occurred after ∼8 ka, although warm stretches did take place. For example, on the Antarctic Peninsula and in Patagonia the interval from 4 to ∼3 ka was typically warm, but conditions were not uniform in either region. We also infer that reduced and expanded glacier extents in Patagonia and the eastern Antarctic Peninsula tend to occur when conditions resemble a persistent positive and negative southern annular mode, respectively. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165071
Appears in Collections: 气候变化与战略
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作者单位: Geochemistry, Lamont-Doherty Earth Observatory, Palisades, NY 10964, United States; Instituto Antártico Argentino, Argentina; Centro de Investigaciones en Ciencias de la Tierra, CICTERRA, CONICET, Facultad de Ciencias Exactas, Físicas y Naturales, UNC, Córdoba, Argentina; Department of Earth and Environmental Sciences, Columbia University, New York, NY 10027, United States; Núcleo Milenio Paleoclima, Universidad de Chile, Santiago, Chile; Instituto de Geografía, Pontificia Universidad Católica de Chile, Santiago, Chile
Recommended Citation:
Kaplan M.R.,Strelin J.A.,Schaefer J.M.,et al. Holocene glacier behavior around the northern Antarctic Peninsula and possible causes[J]. Earth and Planetary Science Letters,2020-01-01,534