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| Titel |
Freshwater flux to Sermilik Fjord, SE Greenland |
| VerfasserIn |
S. H. Mernild, I. M. Howat, Y. Ahn, G. E. Liston, K. Steffen, B. H. Jakobsen, B. Hasholt, B. Fog, D. As |
| 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. 4 ; Nr. 4, no. 4 (2010-10-26), S.453-465 |
| Datensatznummer |
250001896
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| Publikation (Nr.) |
 copernicus.org/tc-4-453-2010.pdf |
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| Zusammenfassung |
| Terrestrial inputs of freshwater flux to Sermilik Fjord, SE Greenland, were
estimated, indicating ice discharge to be the dominant source of freshwater.
A freshwater flux of 40.4 ± 4.9×109 m3 y−1 was
found (1999–2008), with an 85% contribution originated from ice
discharge (65% alone from Helheim Glacier), 11% from terrestrial
surface runoff (from melt water and rain), 3% from precipitation at the
fjord surface area, and 1% from subglacial geothermal and frictional
melting due to basal ice motion. The results demonstrate the dominance of
ice discharge as a primary mechanism for delivering freshwater to Sermilik
Fjord. Time series of ice discharge for Helheim Glacier, Midgård
Glacier, and Fenris Glacier were calculated from satellite-derived average
surface velocity, glacier width, and estimated ice thickness, and
fluctuations in terrestrial surface freshwater runoff were simulated based
on observed meteorological data. These simulations were compared and bias
corrected against independent glacier catchment runoff observations. Modeled
runoff to Sermilik Fjord was variable, ranging from 2.9 ± 0.4×109 m3 y−1 in 1999 to 5.9 ± 0.9×109 m3 y−1 in 2005. The sub-catchment runoff of the Helheim Glacier region
accounted for 25% of the total runoff to Sermilik Fjord. The runoff
distribution from the different sub-catchments suggested a strong influence
from the spatial variation in glacier coverage, indicating high runoff
volumes, where glacier cover was present at low elevations. |
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