Distribution and Attribution of Terrestrial Snow Cover Phenology Changes over the Northern Hemisphere during 2001–2020

Snow cover phenology has exhibited dramatic changes in the past decades. However, distribution and attribution of hemispheric scale snow anomalies remain unclear. Using satellite-retrieved products, ground observations, reanalysis climate variables, this study explored onset date, end duration days over Northern Hemisphere from 2001 to 2020. The latitudinal altitudinal distributions 20-year averaged are well represented by matrixes. validation results using 850 stations demonstrated that matrixes capture spatial variability at 95% significance level during overlapping period 2001–2017. Moreover, a delayed date an earlier (1.12 decade?1, p < 0.05) detected 2001–2020 based on In addition, analysis indicated dominates increased melting season temperature is key driving factor NH 2001–2020. These helpful understanding recent change can contribute projection studies.