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| Titel |
Multi-decadal marine- and land-terminating glacier recession in the Ammassalik region, southeast Greenland |
| VerfasserIn |
S. H. Mernild, J. K. Malmros, J. C. Yde, N. T. Knudsen |
| 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 ; 6, no. 3 ; Nr. 6, no. 3 (2012-06-06), S.625-639 |
| Datensatznummer |
250003596
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| Publikation (Nr.) |
 copernicus.org/tc-6-625-2012.pdf |
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| Zusammenfassung |
| Landsat imagery was applied to elucidate glacier fluctuations of land- and
marine-terminating outlet glaciers from the Greenland Ice Sheet (GrIS) and
local land-terminating glaciers and ice caps (GIC) peripheral to the GrIS in
the Ammassalik region, Southeast Greenland, during the period 1972–2011.
Data from 21 marine-terminating glaciers (including the glaciers Helheim,
Midgaard, and Fenris), the GrIS land-terminating margin, and 35 GIC were
examined and compared to observed atmospheric air temperatures,
precipitation, and reconstructed ocean water temperatures (at 400 m depth in
the Irminger Sea). Here, we document that net glacier recession has occurred
since 1972 in the Ammassalik region for all glacier types and sizes, except
for three GIC. The land-terminating GrIS and GIC reflect lower marginal and
areal changes than the marine-terminating outlet glaciers. The mean annual
land-terminating GrIS and GIC margin recessions were about three to five
times lower than the GrIS marine-terminating recession. The
marine-terminating outlet glaciers had an average net frontal retreat for
1999–2011 of 0.098 km yr−1, which was significantly higher than in
previous sub-periods 1972–1986 and 1986–1999. For the marine-terminating
GrIS, the annual areal recession rate has been decreasing since 1972, while
increasing for the land-terminating GrIS since 1986. On average for all the
observed GIC, a mean net frontal retreat for 1986–2011 of 0.010 ± 0.006 km yr−1
and a mean areal recession of around 1% per year
occurred; overall for all observed GIC, a mean recession rate of 27 ± 24%
occurred based on the 1986 GIC area. Since 1986, five GIC melted away
in the Ammassalik area. |
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