气候变化领域集成服务门户(CCPortal): Bathymetry constrains ocean heat supply to Greenland’s largest glacier tongue

CCPortal

DOI	10.1038/s41561-019-0529-x
	Bathymetry constrains ocean heat supply to Greenland’s largest glacier tongue
	Schaffer J.; Kanzow T.; von Appen W.-J.; von Albedyll L.; Arndt J.E.; Roberts D.H.
发表日期	2020
ISSN	17520894
卷号	13 期号:3
英文摘要	Mass loss from the Greenland ice sheet has increased over the past two decades, currently accounting for 25% of global sea-level rise. This is due to increased surface melt driven by atmospheric warming and the retreat and acceleration of marine-terminating glaciers forced by oceanic heat transport. We use ship-based profiles, bathymetric data and moored time series from 2016 to 2017 of temperature, salinity and water velocity collected in front of the floating tongue of the 79 North Glacier in Northeast Greenland. These observations indicate that a year-round bottom-intensified inflow of warm Atlantic Water through a narrow channel is constrained by a sill. The associated heat transport leads to a mean melt rate of 10.4 ± 3.1 m yr–1 on the bottom of the floating glacier tongue. The interface height between warm Atlantic Water and colder overlying water above the sill controls the ocean heat transport’s temporal variability. Historical hydrographic data show that the interface height has risen over the past two decades, implying an increase in the basal melt rate. Additional temperature profiles at the neighbouring Zachariæ Isstrøm suggest that ocean heat transport here is similarly controlled by a near-glacier sill. We conclude that near-glacier, sill-controlled ocean heat transport plays a crucial role for glacier stability. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	acceleration; bathymetry; channel flow; climate forcing; flow velocity; heat transfer; hydrography; ice sheet; melting; salinity; temporal variation; warming; water temperature; Arctic; Greenland; Greenland Ice Sheet
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/124502
作者单位	Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; University of Bremen, Bremen, Germany; Department of Geography, Durham University, Durham, United Kingdom
推荐引用方式 GB/T 7714	Schaffer J.,Kanzow T.,von Appen W.-J.,等. Bathymetry constrains ocean heat supply to Greenland’s largest glacier tongue[J],2020,13(3).
APA	Schaffer J.,Kanzow T.,von Appen W.-J.,von Albedyll L.,Arndt J.E.,&Roberts D.H..(2020).Bathymetry constrains ocean heat supply to Greenland’s largest glacier tongue.Nature Geoscience,13(3).
MLA	Schaffer J.,et al."Bathymetry constrains ocean heat supply to Greenland’s largest glacier tongue".Nature Geoscience 13.3(2020).