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Remote Sens. 2017, 9(11), 1201; https://doi.org/10.3390/rs9111201

Satellite and Ground Observations of Snow Cover in Tibet during 2001–2015

1
Geophysical Institute, University of Bergen, Allégaten 70, N-5007 Bergen, Norway
2
Institute of Tibetan Plateau Atmospheric and Environmental Scientific Research, Lhasa 850000, China
3
Lhasa Division of the Institute of Plateau Meteorology, China Meteorological Administration, Chengdu 610072, China
*
Author to whom correspondence should be addressed.
Received: 24 September 2017 / Revised: 28 October 2017 / Accepted: 20 November 2017 / Published: 22 November 2017
(This article belongs to the Special Issue Cryospheric Remote Sensing II)
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Abstract

The seasonal snow cover of the Tibetan Plateau exerts a profound environmental influence both regionally and globally. Daily observations of snow depth at 37 meteorological stations in Tibet and MODIS eight-day snow products (MOD10A2) during the period 2001–2015 are analyzed with respect to the frequency and spatial distribution of snow cover for each season and for various altitude ranges. The results show that the average snow cover percentage was 16%. Snow cover frequency was less than 21% for 70% of the Tibetan area, while it was more than 40% in eastern Tibet and in the Himalayas. We also estimated the variations in the starting times of snow accumulation and ablation. During the 15 years, both datasets revealed a significant trend of earlier onset of ablation, but no evident trend for the start of accumulation. The two datasets differed slightly with respect to the seasonal variation of snow cover. MODIS data showed more snow in winter than in other seasons, but the ground data showed most snow in early spring. For the station locations, the correlation between ground and MODIS snow cover percentage (number of snow-covered stations/number of cloud-free stations) is 0.77. Combining the advantages of remote sensing data and ground observation data is the best way to investigate snow in Tibet. View Full-Text
Keywords: snow cover; snow depth; season; altitude; Tibet; MODIS; snow cover frequency snow cover; snow depth; season; altitude; Tibet; MODIS; snow cover frequency
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Basang, D.; Barthel, K.; Olseth, J.A. Satellite and Ground Observations of Snow Cover in Tibet during 2001–2015. Remote Sens. 2017, 9, 1201.

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