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| Titel |
Changes in the southeast Vatnajökull ice cap, Iceland, between ~ 1890 and 2010 |
| VerfasserIn |
H. Hannesdóttir, H. Björnsson, F. Pálsson, G. Aðalgeirsdóttir, Sv. Guðmundsson |
| 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 ; 9, no. 2 ; Nr. 9, no. 2 (2015-03-19), S.565-585 |
| Datensatznummer |
250116770
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| Publikation (Nr.) |
 copernicus.org/tc-9-565-2015.pdf |
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| Zusammenfassung |
| Area and volume changes and the average geodetic mass balance of the
non-surging outlet glaciers of the southeast Vatnajökull ice cap, Iceland,
during different time periods between ~ 1890 and 2010, are derived from
a multi-temporal glacier inventory. A series of digital elevation models
(DEMs) (~ 1890, 1904, 1936, 1945, 1989, 2002, 2010) are compiled from
glacial geomorphological features, historical photographs, maps, aerial
images, DGPS measurements and a lidar survey. Given the mapped basal
topography, we estimate volume changes since the end of the Little Ice Age
(LIA) ~ 1890. The variable volume loss of the outlets to similar
climate forcing is related to their different hypsometry, basal topography,
and the presence of proglacial lakes. In the post-LIA period, the glacierized
area decreased by 164 km2 (or from 1014 to 851 km2) and the
glaciers had lost 10–30 % of their ~ 1890 area by 2010 (anywhere
from 3 to 36 km2). The glacier surface lowered by 150–270 m near the
terminus and the outlet glaciers collectively lost 60 ± 8 km3 of
ice, which is equivalent to 0.15 ± 0.02 mm of sea-level rise. The
volume loss of individual glaciers was in the range of 15–50%,
corresponding to a geodetic mass balance between −0.70 and
−0.32 m w.e. a−1. The annual rate of mass change during the
post-LIA period was most negative in 2002–2010, on average
−1.34 ± 0.12 m w.e. a−1, which is among the most negative
mass balance values recorded worldwide in the early 21st century. |
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