DOI: 10.5194/tc-14-2729-2020
论文题名: Drivers for Atlantic-origin waters abutting Greenland
作者: Gillard L.C. ; Hu X. ; Myers P.G. ; Hvid Ribergaard M. ; Lee C.M.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 8 起始页码: 2729
结束页码: 2753
语种: 英语
英文关键词: fjord
; freshwater input
; heat flux
; heat transfer
; ice sheet
; meltwater
; sea ice
; sea surface temperature
; trough
; Arctic
; Atlantic Ocean
; Atlantic Ocean
; Baffin Bay
; Disko Bay
; Greenland
; Greenland Ice Sheet
; Helheim Glacier
; Irminger Sea
; Jakobshavn Glacier
; Melville Bay
英文摘要: The oceanic heat available in Greenland's troughs is dependent on the geographic location of the trough, the water origin, and how the water is impacted by local processes along the pathway to the trough. This study investigates the spatial pattern and quantity of the warm water (with a temperature greater 1:5 C) brought to the shelf and into the troughs abutting the Greenland Ice Sheet (GrIS). An increase in ocean heat in these troughs may drive a retreat of the GrIS. Warm water that is exchanged from the trough into the fjord may influence the melt on the marine-terminating glaciers. Several regional ocean model experiments were used to study regional differences in heat transport through troughs. Results showed that warm water extends north into Baffin Bay, reaching as far north as the Melville Bay troughs. Melville Bay troughs experienced warming following 2009. From 2004 to 2006, model experiments captured an increase in onshore heat flux in the Disko Bay trough, coinciding with the timing of the disintegration of Jakobshavn Isbrae's floating tongue and observed ocean heat increase in Disko Bay. The seasonality of the maximum onshore heat flux differs due to distance away from the Irminger Sea. Ocean temperatures near the northwestern coast and southeastern coast respond differently to changes in meltwater from Greenland and high-frequency atmospheric phenomena. With a doubling of the GrIS meltwater, Baffin Bay troughs transported 20% more heat towards the coast. Fewer storms resulted in a doubling of onshore heat through Helheim Glacier's trough. These results demonstrate the regional variability of onshore heat transport through troughs and its potential implications to the GrIS. © 2020 EDP Sciences. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164462
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB, Canada; Bedford Institute of Oceanography, Dartmouth, NS, Canada; Danish Meteorological Institute, Copenhagen, Denmark; Applied Physics Laboratory, University of Washington, Seattle, WA, United States
Recommended Citation:
Gillard L.C.,Hu X.,Myers P.G.,et al. Drivers for Atlantic-origin waters abutting Greenland[J]. Cryosphere,2020-01-01,14(8)