DOI: 10.1002/2017JF004376
Scopus记录号: 2-s2.0-85040178889
论文题名: Effect of Topography on Subglacial Discharge and Submarine Melting During Tidewater Glacier Retreat
作者: Amundson J.M. ; Carroll D.
刊名: Journal of Geophysical Research: Earth Surface
ISSN: 21699003
出版年: 2018
卷: 123, 期: 1 起始页码: 66
结束页码: 79
语种: 英语
英文关键词: subglacial discharge
; submarine melting
; tidewater glacier
英文摘要: To first order, subglacial discharge depends on climate, which determines precipitation fluxes and glacier mass balance, and the rate of glacier volume change. For tidewater glaciers, large and rapid changes in glacier volume can occur independent of climate change due to strong glacier dynamic feedbacks. Using an idealized tidewater glacier model, we show that these feedbacks produce secular variations in subglacial discharge that are influenced by subglacial topography. Retreat along retrograde bed slopes (into deep water) results in rapid surface lowering and coincident increases in subglacial discharge. Consequently, submarine melting of glacier termini, which depends on subglacial discharge and ocean thermal forcing, also increases during retreat into deep water. Both subglacial discharge and submarine melting subsequently decrease as glacier termini retreat out of deep water and approach new steady state equilibria. In our simulations, subglacial discharge reached peaks that were 6–17% higher than preretreat values, with the highest values occurring during retreat from narrow sills, and submarine melting increased by 14% for unstratified fjords and 51% for highly stratified fjords. Our results therefore indicate that submarine melting acts in concert with iceberg calving to cause tidewater glacier termini to be unstable on retrograde beds. The full impact of submarine melting on tidewater glacier stability remains uncertain, however, due to poor understanding of the coupling between submarine melting and iceberg calving. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114786
Appears in Collections: 气候减缓与适应
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作者单位: Department of Natural Sciences, University of Alaska Southeast, Juneau, AK, United States; Department of Earth Sciences, University of Oregon, Eugene, OR, United States
Recommended Citation:
Amundson J.M.,Carroll D.. Effect of Topography on Subglacial Discharge and Submarine Melting During Tidewater Glacier Retreat[J]. Journal of Geophysical Research: Earth Surface,2018-01-01,123(1)