Climate Change in the Upstream of Manas River Basin in the Past 5 Decades

According to observed data of temperature,precipitation series( 1959-2008) and evaporation series( 1984-2000) at Kensiwate hydrological gauging station in the upstream of Manas River Basin. We analysed the climate change in this region by using linear regression,Pearson correlation coefficient,moving average for five years,Mann-Kendall nonparametric statistical test and Morlet wavelet analysis method. Results showed that: 1) the climate of upstream Manas River Basin was mostly warm and wet in the past 5 decades. The annual average temperature increased remarkably with obvious seasonal difference within the year( temperature increased in summer and autumn). Precipitation was increasing as a whole but was not significant,and distributed unevenly within the year( precipitation concentrated in spring and summer); 2) The annual evaporation fluctuated around 1651. 2 mm in the recent two decades,displaying a trend of slight increase; 3) Temperature and precipitation increased abruptly from low level to high level during the 1990 s,and there was an obvious inter-annual cycle change.