Study on Forty-year Snow Cover of Zoige Plateau

By using the observation data of snow and frozen soil from 1971 to 2011 in Zoige weather station, this paper analyses the variation of frozen soil in winter-spring (from October to next may) snow cover, and their relations to the temperature and precipitation.The decreasing of snow cover is a response to climate warming, on the other side, there are no apparent long-term trend for frozen soil.However, the correlation between the frozen soil and temperature reveals a negative relationship.Wavelet analysis shows that the dominant periods of frozen soil depth is 8 years while the dominant periods of average temperature during the snow season is 4 years.