气候变化领域集成服务门户(CCPortal): Younger Dryas ice margin retreat in Greenland: New evidence from southwestern Greenland

CCPortal

DOI	10.5194/cp-17-587-2021
	Younger Dryas ice margin retreat in Greenland: New evidence from southwestern Greenland
	Funder S.; Sørensen A.H.L.; Larsen N.K.; Bjørk A.A.; Briner J.P.; Olsen J.; Schomacker A.; Levy L.B.; Kjær K.H.
发表日期	2021
ISSN	1814-9324
起始页码	503
结束页码	522
卷号	17 期号:2
英文摘要	To date the final stage in deglaciation of the Greenland shelf, when a contiguous ice sheet margin on the inner shelf transitioned to outlet glaciers in troughs with intervening ice-free areas, we generated cosmogenic 10Be dates from bedrock knobs on six outlying islands along a stretch of 300 km of the southwestern Greenland coast. Despite 10Be inheritance influencing some dates, the ages generally support a Greenland Ice Sheet (GrIS) margin that retreated off the inner shelf during the middle Younger Dryas (YD) period. Published 10Be-and 14C-dated records show that this history of the GrIS margin is seen in other parts of Greenland but with large variations in the extent and speed of retreat, sometimes even between neighbouring areas. Areas with a chronology extending into the Allerød period show no marked ice margin change at the Allerød-YD transition except in northernmost Greenland. In contrast, landforms on the shelf (moraines and grounding zone wedges) have been suggested to indicate YD readvances or long-lasting ice margin stillstands on the middle shelf. However, these features have been dated primarily by correlation with cold periods in the ice core temperature records. Ice margin retreat during the middle and late YD is explained by advection of warm subsurface water at the ice margin and by increased seasonality. Our results therefore point to the complexity of the climate-ice margin relation and to the urgent need for direct dating of the early deglaciation history of Greenland. © 2021 Copernicus GmbH. All rights reserved.
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183597
作者单位	Globe Institute, University of Copenhagen, Copenhagen, 1350, Denmark; Geosyd, Copenhagen, 2730, Denmark; Department of Geoscience and Natural Resource Management, University of Copenhagen, Copenhagen, 1350, Denmark; Department of Geology, University at Buffalo, Buffalo, NY 14260, United States; Department of Physics and Astronomy, Aarhus University, Aarhus, 8000, Denmark; Department of Geosciences, UiT, Arctic University of Norway, Tromsø, 9037, Norway; Department of Geology, Humboldt State University, 1 Harpst St, Arcata, CA 95521, United States
推荐引用方式 GB/T 7714	Funder S.,Sørensen A.H.L.,Larsen N.K.,et al. Younger Dryas ice margin retreat in Greenland: New evidence from southwestern Greenland[J],2021,17(2).
APA	Funder S..,Sørensen A.H.L..,Larsen N.K..,Bjørk A.A..,Briner J.P..,...&Kjær K.H..(2021).Younger Dryas ice margin retreat in Greenland: New evidence from southwestern Greenland.Climate of the Past,17(2).
MLA	Funder S.,et al."Younger Dryas ice margin retreat in Greenland: New evidence from southwestern Greenland".Climate of the Past 17.2(2021).