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| Titel |
Ice-shelf buttressing and the stability of marine ice sheets |
| VerfasserIn |
G. H. Gudmundsson |
| 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 ; 7, no. 2 ; Nr. 7, no. 2 (2013-04-04), S.647-655 |
| Datensatznummer |
250017956
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| Publikation (Nr.) |
 copernicus.org/tc-7-647-2013.pdf |
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| Zusammenfassung |
| Ice-shelf buttressing and the stability of marine-type ice sheets are
investigated numerically. Buttressing effects are analysed for a situation
where a stable grounding line is located on a bed sloping upwards in the
direction of flow. Such grounding-line positions are known to be
unconditionally unstable in the absence of transverse flow variations. It is
shown that ice-shelf buttressing can restore stability under these
conditions. Ice flux at the grounding line is, in general, not a
monotonically increasing function of ice thickness. This, possibly at first
somewhat counterintuitive result, is found to be fully consistent
with recent theoretical work. Grounding lines on retrograde slopes are
conditionally stable, and the stability regime is a non-trivial function of bed
and ice-shelf geometry. The stability of grounding lines cannot be assessed
from considerations of local bed slope only. |
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