Trend Analysis of the Meteorological Elements in the Jiuquan Basin, Gansu *

Hydrological data series from 1955-2004 in the Jiuquan basin were used to analyze the trend and mutation of temperature and precipitation Based on the cumulative anomaly and Mann-Kendall methods. The results show that the temperature in the Jiuquan basin as a whole is a certain upward trend with a slow decline between 1955-1985, then there have been a clear upward trend, while the precipitation don't have apparent change trend with frequent and large fluctuations.