| 天气与气候 |
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| Rainy Season Characteristics in West China and Impact of the Plateau Monsoon |
| CHEN Shao-yong1,2, LIN Shu1, WANG Jin-song1, WU Jie2 |
| 1.Key laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province; Key Open Laboratory of Arid Climatic Change and Disaster Reduction of CMA, Institute of Arid Meteorology, Chinese Meteorological Administration, Lanzhou 730020, China; 2.Meteorological Bureau of Baiyin, Baiyin 730900, Gansu, China |
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Abstract Based on rainfall data of 269 climatic stations in west China during 1961—2008 and the definition of rainy season, the spatial distribution and temporal variation characteristics of rainy season in west China are analyzed. The main results are as follows. The initial date and ending date of rainy season are early in northwest and southeast areas of west China, and late in middle area of west China. Rainy season is not obvious in Xinjiang. The west China can be divided into 6 subareas according to different initial dates and ending dates of rainy season: northern Xinjiang, south Xinjiang, west plateau, east plateau, southeast area, and northeast area. There are three kinds of rainy season in west China by their temporal variations, and the south Xinjiang, the western plateau and the southeast area is single-peak, the northern Xinjiang and the east plateau is two-peaks, the northeast area is three-peaks. In the east side of Tibet plateau and west Inner Mongolia, the initial date of rainy season postpones, and the ending date advances, so there is a shortening tendency for rainy season. The tendency is opposite in other areas of west China. There is an isotopic vibration for the decadal variation of initial date and ending date of the rainy season, namely the postpone or advance of initial date of the rainy season is concord with the ending date of the rainy season.
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Received: 26 August 2010
Published: 20 May 2011
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2011, Vol. 31 
