DOI: 10.1038/s41561-019-0529-x
论文题名: Bathymetry constrains ocean heat supply to Greenland’s largest glacier tongue
作者: Schaffer J. ; Kanzow T. ; von Appen W.-J. ; von Albedyll L. ; Arndt J.E. ; Roberts D.H.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 3 起始页码: 227
结束页码: 231
语种: 英语
英文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169668
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Schaffer J.,Kanzow T.,von Appen W.-J.,et al. Bathymetry constrains ocean heat supply to Greenland’s largest glacier tongue[J]. Nature Geoscience,2020-01-01,13(3)