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Brahmbhatt, R. M.
- Spatio-Temporal Variability of Snow Cover in Alaknanda, Bhagirathi and Yamuna Sub-Basins, Uttarakhand Himalaya
Abstract Views :247 |
PDF Views:125
Authors
B. P. Rathore
1,
S. K. Singh
1,
I. M. Bahuguna
1,
R. M. Brahmbhatt
2,
A. S. Rajawat
1,
A. Thapliyal
3,
A. Panwar
3,
Ajai
1
Affiliations
1 Space Applications Centre (ISRO), Ahmedabad 380 015, IN
2 M.G. Science Institute, Ahmedabad 380 009, IN
3 Uttarakhand Space Application Centre, Dehradun 248 006, IN
1 Space Applications Centre (ISRO), Ahmedabad 380 015, IN
2 M.G. Science Institute, Ahmedabad 380 009, IN
3 Uttarakhand Space Application Centre, Dehradun 248 006, IN
Source
Current Science, Vol 108, No 7 (2015), Pagination: 1375-1380Abstract
Advance wide field sensor (AWiFS) data of RESOURCESAT-1 and 2 satellites of IRS series were used to produce snow cover products at 10-day interval from 2004 to 2012 covering October to June of consecutive years for Alaknanda, Bhagirathi and Yamuna sub-basins of Ganga basin in the Himalayan region. The snow products were generated using Normalized Difference Snow Index (NDSI) at a spatial resolution of 56 m using green (B2) and SWIR (B5) channels of AWiFS sensor. Minimum and maximum snow cover was found to be 998, 669, 141 sq. km, and 7874, 5876, 3068 sq. km for Alaknanda, Bhagirathi and Yamuna sub-basins respectively. The areal extent of snow was higher than the mean during the years 2004-2005, 2007-2008 and 2011-2012 for all sub-basins. Mean of monthly fluctuations between maximum and minimum snow cover were recorded as 3105, 2305, 1235 sq. km corresponding to variation in snow line altitude of 1613, 1770, 1440 m respectively. A subtle increase in the snow cover has been observed in these three sub-basins during 2004-2012. The results matched well with the variations in temperature taken from nearby ground weather stations. Snow cover products were analysed to understand spatio-temporal variability of accumulation and ablation of snow in the three sub-basins. Monthly fluctuations in snow cover were high during accumulation period than in ablation. This work also attributes in generation of long-term database which will be useful for understanding climatic variations over Himalayan region.Keywords
Ablation, AWiFS, Ganga, NDSI, Snow Cover.Full Text
- Trends of Snow Cover in Western and West-Central Himalayas during 2004–2014
Abstract Views :225 |
PDF Views:80
Authors
B. P. Rathore
1,
I. M. Bahuguna
1,
S. K. Singh
1,
R. M. Brahmbhatt
2,
S. S. Randhawa
3,
P. Jani
4,
S. K. S. Yadav
5,
A. S. Rajawat
1
Affiliations
1 Space Applications Centre (ISRO), Ahmedabad 380 015, IN
2 M. G. Science Institute, Ahmedabad 380 009, IN
3 State Centre on Climate Change, SCSTE, Shimla 171 009, IN
4 CEPT University, Ahmedabad 380 009, IN
5 Remote Sensing Applications Centre, Lucknow 226 021, IN
1 Space Applications Centre (ISRO), Ahmedabad 380 015, IN
2 M. G. Science Institute, Ahmedabad 380 009, IN
3 State Centre on Climate Change, SCSTE, Shimla 171 009, IN
4 CEPT University, Ahmedabad 380 009, IN
5 Remote Sensing Applications Centre, Lucknow 226 021, IN
Source
Current Science, Vol 114, No 04 (2018), Pagination: 800-807Abstract
The extent of snow cover on the earth is considered an important parameter for numerous climatological and hydrological applications. Snow cover dynamics in mountainous regions is a vital input for energy balance, glacier mass balance, climate change and snowmelt runoff modelling. There have been global efforts for monitoring of snow cover of earth at varying spatial and temporal scales by generation of snow products. Among these, one of the high temporal and spatial resolution datasets has been generated using advanced wide field sensor data for Western and West-Central Himalayan region at the Space Applications Centre, Ahmedabad. This is done using an algorithm developed based on normalized difference snow index. This paper discusses the trends of snow cover from 2004 to 2014 based on an input of approximately 12,600 snow cover products at sub-basin scale in Indus, Chenab, Satluj and Ganga basins. Analysis of snow cover shows high variability during accumulation than in ablation period. A subtle increase in snow cover was observed in all basins during 2004–2014.Keywords
Ablation, Accumulation, AWiFS, Snow Cover, NDSI, Western and West-Central Himalaya.Full Text
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