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| Titel |
Inter-annual variations of snow days over Switzerland from 2000-2010 derived from MODIS satellite data |
| VerfasserIn |
N. Foppa, G. Seiz |
| 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. 2 ; Nr. 6, no. 2 (2012-03-23), S.331-342 |
| Datensatznummer |
250003481
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| Publikation (Nr.) |
 copernicus.org/tc-6-331-2012.pdf |
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| Zusammenfassung |
| Snow cover plays a vital role in the Swiss Alps and therefore it is of major
interest to determine and understand its variability on different
spatiotemporal scales. Within the activities of the National Climate
Observing System (GCOS Switzerland) inter-annual variations of snow days
over Switzerland were derived from 2000 to 2010 based on data from the
Moderate Resolution Imaging Spectroradiometer (MODIS) on board the Terra
satellite. To minimize the impact of cloud cover on the MODIS snow product
MOD10C1, we implemented a post-processing technique based on a forward and
backward gap-filling approach. Using the proposed methodology it was
possible to determine the total number of annual snow days over Switzerland
from 2000 to 2010 (SCDMODIS). The accuracy of the calculated snow days
per year were quantitatively evaluated against three in situ snow
observation sites representing different climatological regimes
(SCDin_situ). Various statistical indices were computed and analysed
over the entire period. The overall accuracy between SCDMODIS and
SCDin_situ on a daily basis over 10 yr is 88% to 94%,
depending on the regional characteristics of each validation site.
Differences between SCDMODIS and SCDin_situ vary during the snow
accumulation period in autumn and smaller differences after spring, in
particularly for the Central Alps. |
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