Revealing four decades of snow cover dynamics in the Hindu Kush Himalaya

Summary

This paper presents a systematic four-decade satellite-based assessment of seasonal snow cover dynamics across the entire Hindu Kush Himalaya region using AVHRR GAC data. The authors reveal strong variability in snow cover at multiple time scales and document significantly declining trends in summer and winter months, alongside a shift in seasonal snow cover patterns from mid-spring to mid-fall. The findings underscore the critical cross-disciplinary importance of temporally resolved snow cover data for understanding climate, hydrology, hazard assessment, and impacts on mountain ecosystems and downstream regions.

Regional applicability

This study addresses snow dynamics in a high-mountain region (Hindu Kush Himalaya) that is geographically and climatically distinct from the United Kingdom. However, the methodological approach to long-term satellite snow cover monitoring and the emphasis on seasonal shifts and variability may inform UK climate and hydrological monitoring strategies, particularly for upland regions with winter snow cover.

Key measures

Seasonal snow cover extent, distribution, and temporal dynamics; SSC trends by month and season; spatio-temporal variability at regional and basin scales

Outcomes reported

The study evaluated seasonal snow cover (SSC) dynamics across the Hindu Kush Himalaya region using four decades of satellite data at 0.05° spatial and daily temporal resolution. Findings revealed significantly decreasing SSC trends in individual summer and winter months and a declining tendency from mid-spring to mid-fall, indicating a shift in seasonality.

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