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| Titel |
Reanalysis of multi-temporal aerial images of Storglaciären, Sweden (1959–99) – Part 2: Comparison of glaciological and volumetric mass balances |
| VerfasserIn |
M. Zemp, P. Jansson, P. Holmlund, I. Gärtner-Roer, T. Koblet, P. Thee, W. Haeberli |
| 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.345-357 |
| Datensatznummer |
250001768
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| Publikation (Nr.) |
 copernicus.org/tc-4-345-2010.pdf |
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| Zusammenfassung |
| Seasonal glaciological mass balances have been measured on Storglaciären
without interruption since 1945/46. In addition, aerial surveys have been
carried out on a decadal basis since the beginning of the observation
program. Early studies had used the resulting aerial photographs to produce
topographic glacier maps with which the in-situ observations could be
verified. However, these maps as well as the derived volume changes are
subject to errors which resulted in major differences between the derived
volumetric and the glaciological mass balance. As a consequence, the
original photographs were re-processed using uniform photogrammetric
methods, which resulted in new volumetric mass balances for 1959–69,
1969–80, 1980–90, and 1990–99. We compared these new volumetric mass
balances with mass balances obtained by standard glaciological methods
including an uncertainty assessment considering all related previous
studies. The absolute differences between volumetric and the glaciological
mass balances are 0.8 m w.e. for the period of 1959–69 and 0.3 m w.e. or
less for the other survey periods. These deviations are slightly reduced
when considering corrections for systematic uncertainties due to differences
in survey dates, reference areas, and internal ablation, whereas internal
accumulation systematically increases the mismatch. However, the mean annual
differences between glaciological and volumetric mass balance are less than
the uncertainty of the in-situ stake reading and stochastic error bars of
both data series overlap. Hence, no adjustment of the glaciological data
series to the volumetric one is required. |
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