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| Titel |
Evolution of ice-shelf channels in Antarctic ice shelves |
| VerfasserIn |
R. Drews |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 9, no. 3 ; Nr. 9, no. 3 (2015-06-04), S.1169-1181 |
| Datensatznummer |
250116807
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| Publikation (Nr.) |
 copernicus.org/tc-9-1169-2015.pdf |
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| Zusammenfassung |
| Ice shelves buttress the continental ice flux and mediate ice–ocean
interactions. They are often traversed by channels in which basal melting is
enhanced, impacting ice-shelf stability. Here, channel evolution is
investigated using a transient, three-dimensional full Stokes model and
geophysical data collected on the Roi Baudouin Ice Shelf (RBIS), Antarctica. The
modeling confirms basal melting as a feasible mechanism for channel creation,
although channels may also advect without melting for many tens of
kilometers. Channels can be out of hydrostatic equilibrium depending on their
width and the upstream melt history. Inverting surface elevation for ice
thickness using hydrostatic equilibrium in those areas is erroneous, and
corresponding observational evidence is presented at RBIS by comparing the
hydrostatically inverted ice thickness with radar measurements. The model
shows that channelized melting imprints the flow field characteristically,
which can result in enhanced horizontal shearing across channels. This is
exemplified for a channel at RBIS using observed surface velocities and opens
up the possibility to classify channelized melting from space, an important
step towards incorporating these effects in ice–ocean models. |
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