Abstract：Based on daily precipitation data from 120 stations in Northwest China(NWC) between 1954 and 2003, the changes in precipitation are studied by dividing NWC into two subregions based on REOF analysis. Furthermore, changes in precipitation intensity, frequency and total are investigated. The results are as follows: increase of total precipitation in northwest China is due to precipitation increase in WNWC; both precipitation frequency and intensity have increased in WNWC, while the intensity and frequency have decreased in ENWC.
2005, Vol. 23 
