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| Titel |
Glacier dynamics over the last quarter of a century at Helheim, Kangerdlugssuaq and 14 other major Greenland outlet glaciers |
| VerfasserIn |
S. L. Bevan, A. J. Luckman, T. Murray |
| 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. 5 ; Nr. 6, no. 5 (2012-09-10), S.923-937 |
| Datensatznummer |
250003778
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| Publikation (Nr.) |
 copernicus.org/tc-6-923-2012.pdf |
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| Zusammenfassung |
| The Greenland ice sheet is experiencing increasing rates of mass loss, the
majority of which results from changes in discharge from tidewater glaciers.
Both atmospheric and ocean drivers have been implicated in these dynamic
changes, but understanding the nature of the response has been hampered by the
lack of measurements of glacier flow rates predating the recent period of
warming. Here, using Landsat-5 data from 1985 onwards, we extend back in time
the record of surface velocities and ice-front position for 16 of Greenland's
fastest-flowing tidewater glaciers, and compare these to more recent data
from Landsat-7 and satellite-borne synthetic-aperture radar. Climate
re-analysis data and sea surface temperatures from 1982 show that since 1995
most of Greenland and its surrounding oceans have experienced significant
overall warming, and a switch to a warming trend. During the period from 1985
to 1995 when Greenland and the surrounding oceans were not warming, major
tidewater outlet glaciers around Greenland, including Kangerdlugssuaq and
Helheim, were dynamically stable. Since the mid-1990s, glacier discharge has
consistently been both greater and more variable. Together, these
observations support the hypothesis that recent dynamic change is a rapid
response to climate forcing. Both air and ocean temperatures in this region
are predicted to continue to warm, and will therefore likely drive further
change in outlet glacier discharge. |
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