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| Titel |
Analysis of ice phenology of lakes on the Tibetan Plateau from MODIS data |
| VerfasserIn |
J. Kropáček, F. Maussion, F. Chen, S. Hoerz, V. Hochschild |
| 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 ; 7, no. 1 ; Nr. 7, no. 1 (2013-02-15), S.287-301 |
| Datensatznummer |
250017420
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| Publikation (Nr.) |
 copernicus.org/tc-7-287-2013.pdf |
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| Zusammenfassung |
| The Tibetan Plateau includes a large system of endorheic (closed basin)
lakes. Lake ice phenology, i.e. the timing of freeze-up and break-up and the
duration of the ice cover may provide valuable information about climate
variations in this region. The ice phenology of 59 large lakes on the Tibetan
Plateau was derived from Moderate Resolution Imaging Spectroradiometer
(MODIS) 8-day composite data for the period from 2001 to 2010. Ice cover
duration appears to have a high variability in the studied region due to both
climatic and local factors. Mean values for the duration of ice cover were
calculated for three groups of lakes defined by clustering, resulting in
relatively compact geographic regions. In each group several lakes showed
anomalies in ice cover duration in the studied period. Possible reasons for
such anomalous behaviour are discussed. Furthermore, many lakes do not freeze
up completely during some seasons. This was confirmed by inspection of high
resolution optical data. Mild winter seasons, large water volume and/or high
salinity are the most likely explanations. Trends in the ice cover duration
derived by linear regression for all the studied lakes show a high variation
in space. A correlation of ice phenology variables with parameters describing
climatic and local conditions showed a high thermal dependency of the ice
regime. It appears that the freeze-up tends to be more thermally determined
than break-up for the studied lakes. |
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