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| Titel |
Mass balance, runoff and surges of Bering Glacier, Alaska |
| VerfasserIn |
W. Tangborn |
| 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. 3 ; Nr. 7, no. 3 (2013-05-27), S.867-875 |
| Datensatznummer |
250017971
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| Publikation (Nr.) |
 copernicus.org/tc-7-867-2013.pdf |
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| Zusammenfassung |
| The historical net, ablation and accumulation daily balances, as well as runoff of
Bering Glacier, Alaska are determined for the 1951–2011 period with the PTAA
(precipitation-temperature-area-altitude) model, using daily precipitation
and temperature observations collected at the Cordova and Yakutat weather
stations, together with the area-altitude distribution of the glacier. The
model mean annual balance for this 61 yr period is −0.6 m w.e., the
accumulation balance is +1.4 and the ablation balance is −2.0 m w.e.
Average annual runoff is 2.5 m w.e. Periodic surges of this glacier
transport large volumes of ice to lower elevations where the ablation rate is
higher, producing more negative balances and increasing runoff. Runoff from
Bering Glacier (derived from simulated ablation and precipitation as rain) is
highly correlated with four of the glacier surges that have occurred since
1951. Ice volume loss for the 1972–2003 period measured with the PTAA model
is 2.7 km3 w.e. a−1 and closely agrees with losses for the same
period measured with the geodetic method. It is proposed that the timing and
magnitude of daily snow accumulation and runoff, both of which are controlled
by the glacier's area-altitude distribution and are calculated with the PTAA
model, can be used to determine the probability that a glacier will surge. |
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