Abstract:
Based on homogeneity-adjusted monthly mean temperature, maximum and minimum temperature and precipitation data of 4 stations in Southeastern Tibet from 1971 to 2014, the climatic variations and climate abrupt characteristics of air temperature and precipitation are analyzed by using the methods of linear regression and Mann-Kendall test, etc. The results show that during the past 44 years the annual precipitation decreases with a rate of 1.24 mm/10 a, while that in spring increases, but decreases in other season, especially in autumn. The annual mean temperature has increased in Southeastern Tibet with a rate of 0.28℃/10 a, the trends of mean maximum and minimum temperatures are increasing. On the decadal scale, the annual mean temperature shows increase trend, and the annual precipitation is more in the 1990s and less in the other three decades. According to the Mann-Kendall test, the abrupt change of annual mean temperature occurred in 1994, but no abrupt change appeared for annual and seasonal precipitation.