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| Titel |
Retrieval of snow grain size and albedo of western Himalayan snow cover using satellite data |
| VerfasserIn |
H. S. Negi, A. Kokhanovsky |
| 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 ; 5, no. 4 ; Nr. 5, no. 4 (2011-10-14), S.831-847 |
| Datensatznummer |
250002745
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| Publikation (Nr.) |
 copernicus.org/tc-5-831-2011.pdf |
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| Zusammenfassung |
| In the present study we describe the retrievals of snow grain size and
spectral albedo (plane and spherical albedo) for western Himalayan snow
cover using Hyperion sensor data. The asymptotic radiative transfer (ART)
theory was explored for the snow retrievals. To make the methodology
operational only five spectral bands (440, 500, 1050, 1240 and 1650 nm) of
Hyperion were used for snow parameters retrieval. The bi-spectral method
(440 nm in the visible and 1050/1240 nm in the NIR region) was used to
retrieve snow grain size. Spectral albedos were retrieved using satellite
reflectances and estimated grain size. A good agreement was observed between
retrieved snow parameters and ground observed snow-meteorological
conditions. The satellite retrieved grain sizes were compared with field
spectroradiometer retrieved grain sizes and close results were found for
lower Himalayan snow. The wavelength 1240 nm was found to be more suitable
compared to 1050 nm for grain size retrieval along the steep slopes. The
methodology was able to retrieve the spatial variations in snow parameters
in different parts of western Himalaya which are due to snow climatic and
terrain conditions of Himalaya. This methodology is of importance for
operational snow cover and glacier monitoring in Himalayan region using
space-borne and air-borne sensors. |
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