近50年来葫芦河流域气候变化特征分析

Based on the data of air temperature and precipitation from the meteorological stations in Jingning and Qin’an, Mann-Kendall method is applied to the tendency characteristics of climate changes about resent 50 years in Hulu River Basin, which told us, the general variance tendency of annual mean air temperature is increasing, on the other hand the annual total precipitation is declining; the results of Meyer and Morlet wavelet analys show that there are multi-scaled period changes for annual air temperature and precipitation, which are mid-long periods of 30a, 22a, 12-14a,10a, and 4-7a, 2-3a of short periods for air temperature, and 30a, 20a, 12-14a and 10a which are the mid-long period of annual precipitation ,such as 6-8 and 2-4 of short periods.