Unprecedented occurrence of snow disasters over the Qinghai-Tibetan Plateau since 1980

Continuous snowfall caused natural disasters, called snow disasters here, frequently occur on the Qinghai-Tibetan Plateau of China in recent decades, and cause a large number of losses of animal husbandry and human property. However, their long-term changes are poorly known. Here we use historical records to place recent variations of snow disasters under the background of the past 200 years. There are 366 snow disasters events for the 1820-2009 period, of which 230 happen during 1980-2009. In particular, the count of each decadal events since 1980 is larger than any other time during the past two centuries.