气候变化领域集成服务门户(CCPortal): Multi-phased deglaciation of south and southeast Greenland controlled by climate and topographic setting

CCPortal

DOI	10.1016/j.quascirev.2020.106454
	Multi-phased deglaciation of south and southeast Greenland controlled by climate and topographic setting
	Levy L.B.; Larsen N.K.; Knudsen M.F.; Egholm D.L.; Bjørk A.A.; Kjeldsen K.K.; Kelly M.A.; Howley J.A.; Olsen J.; Tikhomirov D.; Zimmerman S.R.H.; Kjær K.H.
发表日期	2020
ISSN	0277-3791
卷号	242
英文摘要	To put recent Greenland Ice Sheet (GrIS) ice loss into a longer-term context, we must understand its behavior during late-glacial and Early Holocene warming. Previous results seem to suggest that there is a large contrast in the timing of deglaciation between South and Southeast Greenland. However, because of lack of available data, in particular in Southeast Greenland, it is difficult to assess how the ice sheet responded to major late-glacial and Early Holocene climate changes. In this study, we use 41 new 10Be ages to constrain the deglaciation chronology in 12 new locations from the coast to the present ice margin in South and Southeast Greenland. We find that South Greenland (south of 61.5°N) deglaciated between ∼14.8 and 11.9 ka, whereas Southeast Greenland (61.5°N to 68.2°N) deglaciated between ∼11.4 and 11.3 ka. The deglaciation of the coastal, low-intermediate topography in South Greenland coincides with increased air surface temperatures during the Bølling-Allerød with fjords continuing to deglaciate into the Early Holocene. In contrast, the ice sheet persisted at the coast until the late-glacial and Early Holocene in Southeast Greenland, likely because of increased precipitation in the high alpine topography and fjord geometry and bathymetry (e.g. width of fjords and presence of sills). This multi-phased deglaciation demonstrates a contrasting response of the southern GrIS to changes in climate and variations in topographic setting, and that the spatial deglaciation of the GrIS was complex and likely did not respond to a single external climate forcing. © 2020 Elsevier Ltd
英文关键词	10Be dating; Deglaciation; Greenland Ice sheet
语种	英语
scopus关键词	Climate change; Glacial geology; Glaciers; Topography; Climate forcings; Deglaciation chronologies; Deglaciations; Early Holocene; Greenland; Greenland Ice Sheet; Southeast Greenland; Surface temperatures; Ice; Allerod; Bolling; chronology; climate change; climate forcing; deglaciation; fjord; Holocene; late glacial; precipitation (climatology); topography; Arctic; Greenland; Greenland Ice Sheet
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151399
作者单位	Department of Geology, Humboldt State University, 1 Harpst St ArcataCA 95521, United States; Department of Geoscience, Aarhus University, Aarhus, Denmark; Globe Institute, University of Copenhagen, Denmark; Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Denmark; Department of Earth Sciences, Dartmouth College, Hanover, NH, United States; Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark; Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory Livermore, United States; Department of Geoscience and Natural Resource Management, University of Copenhagen, Denmark
推荐引用方式 GB/T 7714	Levy L.B.,Larsen N.K.,Knudsen M.F.,et al. Multi-phased deglaciation of south and southeast Greenland controlled by climate and topographic setting[J],2020,242.
APA	Levy L.B..,Larsen N.K..,Knudsen M.F..,Egholm D.L..,Bjørk A.A..,...&Kjær K.H..(2020).Multi-phased deglaciation of south and southeast Greenland controlled by climate and topographic setting.Quaternary Science Reviews,242.
MLA	Levy L.B.,et al."Multi-phased deglaciation of south and southeast Greenland controlled by climate and topographic setting".Quaternary Science Reviews 242(2020).