气候变化领域集成服务门户(CCPortal): Interruption of two decades of Jakobshavn Isbrae acceleration and thinning as regional ocean cools

CCPortal

DOI	10.1038/s41561-019-0329-3
	Interruption of two decades of Jakobshavn Isbrae acceleration and thinning as regional ocean cools
	Khazendar A.; Fenty I.G.; Carroll D.; Gardner A.; Lee C.M.; Fukumori I.; Wang O.; Zhang H.; Seroussi H.; Moller D.; Noël B.P.Y.; van den Broeke M.R.; Dinardo S.; Willis J.
发表日期	2019
ISSN	17520894
卷号	12 期号:4
英文摘要	Jakobshavn Isbrae has been the single largest source of mass loss from the Greenland Ice Sheet over the last 20 years. During that time, it has been retreating, accelerating and thinning. Here we use airborne altimetry and satellite imagery to show that since 2016 Jakobshavn has been re-advancing, slowing and thickening. We link these changes to concurrent cooling of ocean waters in Disko Bay that spill over into Ilulissat Icefjord. Ocean temperatures in the bay’s upper 250 m have cooled to levels not seen since the mid 1980s. Observations and modelling trace the origins of this cooling to anomalous wintertime heat loss in the boundary current that circulates around the southern half of Greenland. Longer time series of ocean temperature, subglacial discharge and glacier variability strongly suggest that ocean-induced melting at the front has continued to influence glacier dynamics after the disintegration of its floating tongue in 2003. We conclude that projections of Jakobshavn’s future contribution to sea-level rise that are based on glacier geometry are insufficient, and that accounting for external forcing is indispensable. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	acceleration; airborne sensing; boundary current; climate forcing; cooling; decadal variation; glacier advance; glacier dynamics; ice retreat; melting; ocean; oceanic circulation; satellite altimetry; satellite imagery; sea level change; seawater; subglacial environment; Arctic; Disko Bay; Greenland; Greenland Ice Sheet; Ilulissat Icefjord; Jakobshavn Glacier
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124690
作者单位	Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Applied Physics Laboratory, University of Washington, Seattle, WA, United States; Remote Sensing Solutions, Barnstable, MA, United States; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, Netherlands
推荐引用方式 GB/T 7714	Khazendar A.,Fenty I.G.,Carroll D.,et al. Interruption of two decades of Jakobshavn Isbrae acceleration and thinning as regional ocean cools[J],2019,12(4).
APA	Khazendar A..,Fenty I.G..,Carroll D..,Gardner A..,Lee C.M..,...&Willis J..(2019).Interruption of two decades of Jakobshavn Isbrae acceleration and thinning as regional ocean cools.Nature Geoscience,12(4).
MLA	Khazendar A.,et al."Interruption of two decades of Jakobshavn Isbrae acceleration and thinning as regional ocean cools".Nature Geoscience 12.4(2019).