气候变化领域集成服务门户(CCPortal): Holocene glacier behavior around the northern Antarctic Peninsula and possible causes

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DOI	10.1016/j.epsl.2020.116077
	Holocene glacier behavior around the northern Antarctic Peninsula and possible causes
	Kaplan M.R.; Strelin J.A.; Schaefer J.M.; Peltier C.; Martini M.A.; Flores E.; Winckler G.; Schwartz R.
发表日期	2020
ISSN	0012821X
卷号	534
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.
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202693
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
推荐引用方式 GB/T 7714	Kaplan M.R.,Strelin J.A.,Schaefer J.M.,et al. Holocene glacier behavior around the northern Antarctic Peninsula and possible causes[J],2020,534.
APA	Kaplan M.R..,Strelin J.A..,Schaefer J.M..,Peltier C..,Martini M.A..,...&Schwartz R..(2020).Holocene glacier behavior around the northern Antarctic Peninsula and possible causes.Earth and Planetary Science Letters,534.
MLA	Kaplan M.R.,et al."Holocene glacier behavior around the northern Antarctic Peninsula and possible causes".Earth and Planetary Science Letters 534(2020).