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Surface area change detection of snow/ice cover over Zemu Glacier of Sikkim Himalaya

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Abstract

This study assessed the snow/ice surface area changes over the Zemu Glacier in the Eastern Himalayas. Zemu is considered to be the largest glacier in the Eastern Himalayas located in the Sikkim State of India. Change detection in the snow/ice surface areal extent of the Zemu Glacier was delineated from the year 1945 using US Army Map Service-Topographical Sheets and Landsat imageries available from 1987 to 2020. The results obtained solely focus on surface-change delineation using remote sensing satellite data and GIS software. Landsat imagery of the years 1987, 1997, 2009, 2018, and 2020 was used for snow and ice pixel extraction. Normalized Difference Snow Index (NDSI), Snow Cover Index (S3), and new band ratio index were used to extract the pure snow and ice pixels, fresh snow, and debris-covered snow/ice area and pixels mixed with shadow to demarcate the surface area changes. Manual delineation was required and undertaken for better results. A slope raster image was generated from Shuttle Radar Topography Mission (SRTM) digital elevation model (DEM) data to delineate the slope and hill shade. The results illustrate that the snow/ice surface covering the glacier had an area of 113.5 km2 in the year 1945 which was reduced to 78.31 km2 in the year 2020 indicating a total snow/ice surface area loss of 31% in 75 years. A loss of 11.45% was observed from 1945 to 1987 in the areal extent, while from 1987 to 2009, a decadal loss of approximately 7% was observed. The surface area loss of 8.46% from 2009 to 2018 led to infer the maximum loss of snow and ice over the glacier body at a rate of 0.94% per year. Between the years 2018 and 2020, the glacier lost 1.08% of its surface area. The Accumulation Area Ratio (AAR) considering the accumulation and ablation areas of the glacier indicated a gradual decline of the accumulation zone in the recent years. Global Land Ice Measurement from Space (GLIMS) program data with RGI version 6.0 was used as a reference to demarcate the areal extent of Zemu Glacier. The study gained above 80% of overall accuracy by generating a confusion matrix in ArcMap. The analysis of this seasonal snow/ice cover showed that there has been a drastic decline in the surface snow/ice cover area over the Zemu Glacier over the years 1987 to 2020 and NDSI; S3 analysis provided improved results to delineate snow/ice cover area over such steep terrain topography of Sikkim Himalaya.

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Acknowledgements

The authors would like to thank the USGS Earth Explorer data portal for providing geospatial datasets, Global Land Ice Measurements from Space (GLIMS) program at NSIDC for providing the glacier database. The authors would also like to express their gratitude to the Department of Remote Sensing, BIT, Mesra for the facilities availed to conduct the research.

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  1. Department of Remote Sensing, Birla Institute of Technology, Mesra, Jharkhand, 835215, India

    Nikita Roy Mukherjee & A. P. Krishna

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  1. Nikita Roy Mukherjee
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  2. A. P. Krishna
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Correspondence to Nikita Roy Mukherjee.

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Mukherjee, N.R., Krishna, A.P. Surface area change detection of snow/ice cover over Zemu Glacier of Sikkim Himalaya. Environ Monit Assess 195, 611 (2023). https://doi.org/10.1007/s10661-023-11139-3

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