Organization of ice flow by localized regions of elevated geothermal heat flux

被引：25

作者：

Pittard, M. L. ^{[1
,2
]}

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

Roberts, J. L. ^{[2
,3
]}

Watson, C. S. ^{[4
]}

机构：

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

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

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

[4] Univ Tasmania, Sch Land & Food, Hobart, Tas, Australia

来源：

GEOPHYSICAL RESEARCH LETTERS | 2016年 / 43卷 / 07期

基金：

澳大利亚研究理事会;

关键词：

MODEL PISM-PIK; SUBGLACIAL LAKES; EAST ANTARCTICA; SHEET; SURFACE; SHELF; DYNAMICS; GLACIERS; BENEATH;

D O I：

10.1002/2016GL068436

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The impact of localized regions of elevated geothermal heat flux on ice sheet dynamics is largely unknown. Simulations of ice dynamics are produced using poorly resolved and low-resolution estimates of geothermal heat flux. Observations of crustal heat production within the continental crust underneath the Lambert-Amery glacial system in East Antarctica indicate that high heat flux regions of at least 120 mW m(-2) exist. Here we investigate the influence of simulated but plausible, localized regions of elevated geothermal heat flux on ice dynamics using a numerical ice sheet model of the Lambert-Amery glacial system. We find that high heat flux regions have a significant effect across areas of slow-moving ice with the influence extending both upstream and downstream of the geothermal anomaly, while fast-moving ice is relatively unaffected. Our results suggest that localized regions of elevated geothermal heat flux may play an important role in the organization of ice sheet flow.

引用

页码：3342 / 3350

页数：9

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