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| Titel |
Glacier area and length changes in Norway from repeat inventories |
| VerfasserIn |
S. H. Winsvold, L. M. Andreassen, C. Kienholz |
| 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 ; 8, no. 5 ; Nr. 8, no. 5 (2014-10-20), S.1885-1903 |
| Datensatznummer |
250116326
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| Publikation (Nr.) |
 copernicus.org/tc-8-1885-2014.pdf |
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| Zusammenfassung |
| In this study, we assess glacier area and length changes in mainland
Norway from repeat Landsat TM/ETM+-derived inventories and digitized
topographic maps. The multi-temporal glacier inventory consists of
glacier outlines from three time ranges: 1947 to 1985
(GIn50), 1988 to 1997 (GI1990),
and 1999 to 2006 (GI2000). For the northernmost
regions, we include an additional inventory (GI1900)
based on historic maps surveyed between 1895 and 1907. Area and
length changes are assessed per glacier unit, 36 subregions, and
for three main parts of Norway: southern, central, and northern. The
results show a decrease in the glacierized area from
2994 km2 in GIn50 to
2668 km2 in GI2000 (total 2722 glacier
units), corresponding to an area reduction of −326 km2,
or −11% of the initial GIn50 area.
The average length change for the full epoch (within
GIn50 and GI2000) is
−240 m. Overall, the comparison reveals both area
and length reductions as general patterns, even though some glaciers
have advanced. The three northernmost subregions show the
highest retreat rates, whereas the central part of Norway shows
the lowest change rates. Glacier area and length changes indicate
that glaciers in maritime areas in southern Norway have retreated
more than glaciers in the interior, and glaciers in the north have
retreated more than southern glaciers. These observed spatial trends
in glacier change are related to a combination of several factors such as glacier geometry,
elevation, and continentality, especially in southern Norway. |
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