Regional Changes in Icescape Impact Shelf Circulation and Basal Melting

被引：22

作者：

Cougnon, E. A. ^{[1
,2
]}

Galton-Fenzi, B. K. ^{[2
,3
]}

Rintoul, S. R. ^{[2
,4
,5
]}

Legresy, B. ^{[2
,4
]}

Williams, G. D. ^{[1
,2
]}

Fraser, A. D. ^{[2
]}

Hunter, J. R. ^{[2
]}

机构：

[1] Univ Tasmania, Inst Marine & Antarctic Studies, Hobart, Tas, Australia

[2] Antarctic Climate & Ecosyst Cooperat Res Ctr, Hobart, Tas, Australia

[3] Australian Antarctic Div, Kingston, Tas, Australia

[4] Ocean & Atmosphere Commonwealth Sci & Ind Res Org, Hobart, Tas, Australia

[5] Ctr Southern Hemisphere Oceans Res, Hobart, Tas, Australia

来源：

GEOPHYSICAL RESEARCH LETTERS | 2017年 / 44卷 / 22期

基金：

澳大利亚研究理事会;

关键词：

ANTARCTIC ICE SHELVES; MERTZ GLACIER TONGUE; EAST ANTARCTICA; SEA-ICE; GENERAL-CIRCULATION; OCEAN; WATER; MODEL; ADELIE; VARIABILITY;

D O I：

10.1002/2017GL074943

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Ice shelf basal melt is the dominant contribution to mass loss from Antarctic ice shelves. However, the sensitivity of basal melt to changes in icescape (grounded icebergs, ice shelves, and sea ice) and related ocean circulation is poorly understood. Here we simulate the impact of the major 2010 calving event of the Mertz Glacier Tongue (MGT), East Antarctica, and related redistribution of sea ice and icebergs on the basal melt rate of the local ice shelves. We find that the position of the grounded tabular iceberg B9B controls the water masses that reach the nearby ice shelf cavities. After the calving of the MGT and the removal of B9B, warmer water is present both within the MGT cavity and on the continental shelf driving a 57% increase of the deep MGT basal melting. Major changes in icescape influence the oceanic heat flux responsible for basal ice shelf melting.

引用

页码：11519 / 11527

页数：9

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