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| Titel |
Forecasting temperate alpine glacier survival from accumulation zone observations |
| VerfasserIn |
M. S. Pelto |
| 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 ; 4, no. 1 ; Nr. 4, no. 1 (2010-01-29), S.67-75 |
| Datensatznummer |
250001546
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| Publikation (Nr.) |
 copernicus.org/tc-4-67-2010.pdf |
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| Zusammenfassung |
| Temperate alpine glacier survival is dependent on the consistent presence of
an accumulation zone. Frequent low accumulation area ratio values, below
30%, indicate the lack of a consistent accumulation zone, which leads to
substantial thinning of the glacier in the accumulation zone. This thinning
is often evident from substantial marginal recession, emergence of new rock
outcrops and surface elevation decline in the accumulation zone. In the
North Cascades 9 of the 12 examined glaciers exhibit characteristics of
substantial accumulation zone thinning; marginal recession or emergent
bedrock areas in the accumulation zone. The longitudinal profile thinning
factor, f, which is a measure of the ratio of thinning in the accumulation
zone to that at the terminus, is above 0.6 for all glaciers exhibiting
accumulation zone thinning characteristics. The ratio of accumulation zone
thinning to cumulative mass balance is above 0.5 for glacier experiencing
substantial accumulation zone thinning. Without a consistent accumulation
zone these glaciers are forecast not to survive the current climate or
future additional warming. The results vary considerably with adjacent
glaciers having a different survival forecast. This emphasizes the danger of
extrapolating survival from one glacier to the next. |
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