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|a Basal channels on ice shelves |h [electronic resource] |y English. |
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|a [S.l.] : |b American Geophysical Union, |c 2013. |
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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 Recent surveys of floating ice shelves associated with Pine Island
Glacier (Antarctica) and Petermann Glacier (Greenland) indicate that
there are channels incised upward into their bottoms that may serve as the
conduits of meltwater outflow from the sub-ice-shelf cavity. The formation
of the channels, their evolution over time and their impact on ice shelf flow
are investigated using a fully-coupled ice-shelf/sub-ice-shelf-ocean model. The
model simulations suggest that channels may form spontaneously in response
to meltwater plume flow initiated at the grounding line if there are relatively
high melt rates and if there is transverse to ice flow variability in ice-shelf
thickness. Typical channels formed in the simulations have a width of about
1-3 km and a vertical relief of about 100-200 m. Melt rates and sea-water
transport in the channels are significantly higher than on the smooth flat ice
bottom between the channels. The melt channels develop through melting,
deformation and advection with ice shelf flow. Simulations suggest that both
steady-state and cyclic state solutions are possible depending on conditions
along the lateral ice-shelf boundaries. This peculiar dynamics of the system
has strong implications on the interpretation of observations. The richness
of channel morphology and evolution seen in this study suggests that further
observations and theoretical analysis are imperative for understanding
ice shelf behavior in warm oceanic conditions. |
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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 dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15062084/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/20/84/00001/FI15062084_thm.jpg |
