Snow cover on the Tibetan Plateau has changed significantly in the past 21 years. The study used different remote sensing data to create a comprehensive snow cover dataset. They found that snow cover days are influenced by both long-term and short-term snow cycles. Over this period, some areas saw a decrease in snow cover days, mainly in the southeast, while others saw an increase, mainly in the northwest. The decrease in snow cover days in lower elevations was due to reductions in both long-term and short-term snow cycles, while the increase in higher elevations was mainly from longer snow cover duration. This contrasting change in snowpack poses new challenges for managing water resources in the region.