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Organization of ice flow by localized regions of elevated geothermal heat flux
Author(s) -
Pittard M. L.,
GaltonFenzi B. K.,
Roberts J. L.,
Watson C. S.
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl068436
Subject(s) - geothermal gradient , sea ice growth processes , heat flux , geology , geothermal heating , ice sheet , ice stream , flux (metallurgy) , geophysics , glacial period , ice sheet model , atmospheric sciences , petrology , geomorphology , climatology , geothermal energy , heat transfer , mechanics , sea ice thickness , sea ice , cryosphere , materials science , physics , metallurgy
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.