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Changing Features of Precipitation over Nothwest China During the 20th Century

SONG Lian chun 1, 2 , ZHANG Cun jie 2(1. Nanjing Institute of Meteorology, Nanjing Jiangsu 210044, China; 2. Lanzhou Institute of Arid Meteorology,China Meteorological Administration, Lanzhou Gansu 730020, China)  
The precipitation dataset for global land from 1900 to 1998 presented by Dr. Mike Hulme (Climate Research Unit, East Angles University, UK) is the longest global precipitation dataset available now. The evolutional trends of precipitation were studied by using the long historical data in the 20 th century in Northwest China. It is found that the mean precipitation appeared a downward trend from the beginning of the 20 th Century, but a slight upward trend appeared in the end of the 20 th Century. The interannual trends of precipitation between the East and the West showed a contrary variation. In the end of the 20 th century, the mean precipitation appeared an obviously upward trend in the central and western portions of Northwest China, but in the east the mean precipitation continuously decreased, many drought events have happened.
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