Summary
This analysis of 23 years of MODIS satellite snow cover data reveals a significant global decline in seasonal snow cover duration, averaging −0.44 days/year across the full hydrological year. Trends were assessed at both pixel and hydrological catchment scales using robust non-parametric statistical methods, with March showing the most pronounced reduction (−0.16 days/year globally) and certain northern European catchments experiencing declines exceeding −0.8 days/year. The findings document a clear cryospheric response consistent with observed climate warming.
Regional applicability
The study is global in scope and identifies regional variations in snow cover trends. For United Kingdom and northern European contexts, the detailed analysis of the Neman river catchment (Baltic region) provides directly applicable evidence of rapid snow duration decline in comparable temperate continental climates; however, the UK's maritime climate and limited persistent snow cover mean direct applicability to UK snowpack dynamics is limited. The methodological approach using satellite interpolation is transferable and could support UK-focused hydrological monitoring.
Key measures
Snow cover duration (days/year); Mann–Kendall test for trend significance; Theil–Sen slope for trend magnitude; pixel-based and catchment-area-averaged snow cover metrics
Outcomes reported
The study analysed 23 years of daily global snow cover data (2000–2022) using satellite remote sensing and interpolation to identify trends in snow cover duration across different temporal scales and hydrological catchment areas. Global average snow cover duration decreased by −0.44 days/year, with the most significant declines in March (−0.16 days/year) and in specific regions such as the Neman river catchment (−0.82 days/year).
Topic tags
Dig deeper with Pulse AI.
Pulse AI has read the whole catalogue. Ask about this record, its theme, or how the findings apply to UK farming and policy — every answer cites the underlying studies.