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| Titel |
Influence of high-order mechanics on simulation of glacier response to climate change: insights from Haig Glacier, Canadian Rocky Mountains |
| VerfasserIn |
S. Adhikari, S. J. Marshall |
| 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. 5 ; Nr. 7, no. 5 (2013-09-25), S.1527-1541 |
| Datensatznummer |
250085165
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| Publikation (Nr.) |
 copernicus.org/tc-7-1527-2013.pdf |
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| Zusammenfassung |
| Evolution of glaciers in response to climate change has mostly been
simulated using simplified dynamical models. Because these models do
not account for the influence of high-order physics, corresponding
results may exhibit some biases. For Haig Glacier in the Canadian
Rocky Mountains, we test this hypothesis by comparing simulation
results obtained from 3-D numerical models that deal with different
assumptions concerning physics, ranging from simple
shear deformation to comprehensive Stokes flow. In glacier retreat
scenarios, we find a minimal role of high-order mechanics in glacier
evolution, as geometric effects at our site (the presence of an
overdeepened bed) result in limited horizontal movement of ice (flow
speed on the order of a few meters per year). Consequently, high-order
and reduced models all predict that Haig Glacier ceases to exist by
ca. 2080 under ongoing climate warming. The influence of high-order
mechanics is evident, however, in glacier advance scenarios, where ice
speeds are greater and ice dynamical effects become more important.
Although similar studies on other glaciers are essential to
generalize such findings,
we advise that high-order mechanics are important and therefore should be
considered while modeling the evolution of active glaciers. Reduced
model predictions may be adequate for other glaciologic and
topographic settings, particularly where flow speeds are low
and where mass balance changes dominate over
ice dynamics in determining glacier geometry. |
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