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| Titel |
Reanalysis of multi-temporal aerial images of Storglaciären, Sweden (1959–99) – Part 1: Determination of length, area, and volume changes |
| VerfasserIn |
T. Koblet, I. Gärtner-Roer, M. Zemp, P. Jansson, P. Thee, W. Haeberli, P. Holmlund |
| 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. 3 ; Nr. 4, no. 3 (2010-09-08), S.333-343 |
| Datensatznummer |
250001767
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| Publikation (Nr.) |
 copernicus.org/tc-4-333-2010.pdf |
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| Zusammenfassung |
| Storglaciären, located in the Kebnekaise massif in northern Sweden, has
a long history of glaciological research. Early photo documentations date
back to the late 19th century. Measurements of front position variations and
distributed mass balance have been carried out since 1910 and 1945/46,
respectively. In addition to these in-situ measurements, aerial photographs
have been taken at decadal intervals since the beginning of the mass balance
monitoring program and were used to produce topographic glacier maps.
Inaccuracies in the maps were a challenge to early attempts to derive
glacier volume changes and resulted in major differences when compared to
the direct glaciological mass balances. In this study, we reanalyzed
dia-positives of the original aerial photographs of 1959, -69, -80, -90 and
-99 based on consistent photogrammetric processing. From the resulting
digital elevation models and orthophotos, changes in length, area, and
volume of Storglaciären were computed between the survey years,
including an assessment of related errors. Between 1959 and 1999,
Storglaciären lost an ice volume of 19×106 m3, which corresponds to a cumulative ice thickness loss of 5.69 m and a mean
annual loss of 0.14 m. This ice loss resulted largely from a strong volume
loss during the period 1959–80 and was partly compensated during the period
1980–99. As a consequence, the glacier shows a strong retreat in the 1960s,
a slowing in the 1970s, and pseudo-stationary conditions in the 1980s and
1990s. |
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