气候变化领域集成服务门户(CCPortal): Early Holocene collapse of marine-based ice in northwest Greenland triggered by atmospheric warming

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DOI	10.1016/j.quascirev.2020.106360
	Early Holocene collapse of marine-based ice in northwest Greenland triggered by atmospheric warming
	Søndergaard A.S.; Larsen N.K.; Lecavalier B.S.; Olsen J.; Fitzpatrick N.P.; Kjær K.H.; Khan S.A.
发表日期	2020
ISSN	0277-3791
卷号	239
英文摘要	Knowledge about the future response of the Greenland Ice Sheet to global climate change, including ice sheet contributions to sea level rise, is important for understanding the impact of climate change on society. Such studies rely in ice sheet model predictions and improved chronological constraints of past ice sheet extents and paleoclimatic trends. Many regions in Greenland are well studied, but northwest Greenland and especially Melville Bay, being one of the most important regions in terms of dynamical ice mass loss, lack a firm chronology of Holocene ice marginal fluctuations. In this study, we present the first comprehensive chronology for Melville Bay spanning 73.1–75.7°N based on 36 new 10Be exposure ages of boulders and 39 new radiocarbon ages of marine molluscs in Little Ice Age moraines. From weighted mean 10Be exposure ages, excluding 6 outliers, we find that the outer coast in Melville Bay was deglaciated ∼11.6 ± 0.3 ka (n = 15) and the ice margin reached its present-day position 40 km farther inland ∼11.5 ± 0.3 ka (n = 15). Our results suggest an interval of rapid ice-marginal retreat (i.e. collapse) of the northwest GrIS in Melville Bay, most likely triggered by rapidly rising atmospheric temperatures in early Holocene. Additionally, combining the comprehensive dataset of new radiocarbon ages with 26 radiocarbon ages from previous studies shows a restricted ice sheet extent from 9.1 ± 0.2 to 0.4 ± 0.1 cal ka BP, which coincides with increased sea surface temperatures. Our results highlight past ice sheet sensitivity towards climate changes in one of the least explored and most vulnerable regions of Greenland. Furthermore, comparing our new results to already existing ice sheet models (Huy3 and Huy3b) emphasize the proximal relevance of the Agassiz ice core temperature reconstruction for Melville Bay, which indicates the possible sensitivity of the ice sheet to a warming climate and place improved constraints on ice sheet simulations. © 2020 Elsevier Ltd
英文关键词	Climate changes; Cosmogenic isotopes; Glacial history; Holocene; Northwest Greenland
语种	英语
scopus关键词	Atmospheric temperature; Climate change; Climate models; Glaciers; Sea level; Surface waters; Atmospheric warming; Future response; Global climate changes; Greenland Ice Sheet; Ice sheet models; Radiocarbon age; Sea surface temperature (SST); Vulnerable regions; Ice; climate variation; geochronology; global climate; global warming; Holocene; ice core; ice margin; Little Ice Age; marine environment; moraine; Pleistocene; reconstruction; sea ice; sea level change; Arctic; Greenland; Greenland Ice Sheet; Melville Bay; Mollusca
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/151447
作者单位	Department of Geoscience, Aarhus University, Høegh Guldbergs Gade 2, 8000, Aarhus C, Denmark; GLOBE Institute, University of Copenhagen, Øster Voldgade 5-7, 1350, Copenhagen K, Denmark; Department of Physics and Physical Oceanography, Memorial University, St. John's, A1B 3X7, Canada; Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000, Aarhus C, Denmark; Stockholm University, Stockholm Resilience Centre, Kräftriket 2B, Stockholm, SE-10691, Sweden; DTU Space – National Space Institute, Technical University of Denmark, Department of Geodesy, Kgs. Lyngby, Denmark
推荐引用方式 GB/T 7714	Søndergaard A.S.,Larsen N.K.,Lecavalier B.S.,et al. Early Holocene collapse of marine-based ice in northwest Greenland triggered by atmospheric warming[J],2020,239.
APA	Søndergaard A.S..,Larsen N.K..,Lecavalier B.S..,Olsen J..,Fitzpatrick N.P..,...&Khan S.A..(2020).Early Holocene collapse of marine-based ice in northwest Greenland triggered by atmospheric warming.Quaternary Science Reviews,239.
MLA	Søndergaard A.S.,et al."Early Holocene collapse of marine-based ice in northwest Greenland triggered by atmospheric warming".Quaternary Science Reviews 239(2020).