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|a Evidence for elevated and spatially variable geothermal flux beneath the West Antarctic Ice Sheet |h [electronic resource] |y English. |
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|a [S.l.] : |b National Academy of Sciences, |c 2014. |
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|a Proceedings of the National Academy of Sciences |y English. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a Heterogeneous hydrologic, lithologic, and geologic basal boundary
conditions can exert strong control on the evolution, stability,
and sea level contribution of marine ice sheets. Geothermal flux
is one of the most dynamically critical ice sheet boundary conditions
but is extremely difficult to constrain at the scale required
to understand and predict the behavior of rapidly changing
glaciers. This lack of observational constraint on geothermal
flux is particularly problematic for the glacier catchments of
the West Antarctic Ice Sheet within the low topography of the
West Antarctic Rift System where geothermal fluxes are expected
to be high, heterogeneous, and possibly transient. We
use airborne radar sounding data with a subglacial water routing
model to estimate the distribution of basal melting and geothermal
flux beneath Thwaites Glacier, West Antarctica. We show
that the Thwaites Glacier catchment has a minimum average
geothermal flux of ∼114 ± 10 mW/m2 with areas of high flux
exceeding 200 mW/m2 consistent with hypothesized rift-associated
magmatic migration and volcanism. These areas of highest geothermal
flux include the westernmost tributary of Thwaites
Glacier adjacent to the subaerial Mount Takahe volcano and the
upper reaches of the central tributary near the West Antarctic Ice
Sheet Divide ice core drilling site. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a Blankenship, Donald D.. |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15062085/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/20/85/00001/FI15062085thm.jpg |
