中国西北地区季节间干湿变化的时空分布 ———基于PDSI 数据

doi:10.11821/xb200711003

Abstract

Abstract:

Using global Palmer drought severity index (PDSI) database, the seasonal and annual PDSI mean values of 56 grid points covering the period 1953-2003 over northwestern China is analyzed by rotated experience orthogonal function (REOF). The results show that the seasonal and annual means display similar anomaly regions, and furthermore there are five main anomaly regions in the northwestern China based on the annual PDSI mean, i.e., the northern and southern parts of Xinjiang, northern part of plateau, western part of Inner Mongolia and eastern part of northwestern China. The opposite changes of dry-wet conditions are discovered after comparing the curves of feature point series and binomial fit between the eastern and western parts of the northwestern China: The western part of the northwestern China influenced by westerly, a trend of wetting gradually occurred since 1980. On the contrary, a trend of drying gradually occurred in the eastern part of the northwestern China which is mainly influenced by Asian monsoon, and especially in summer and autumn, there is notable trend of drying over the southeastern part of the northwestern China. The northwestern China is obviously affected by westerly, Asian monsoon and Tibetan Plateau. There are differences among the responses of the dry-wet conditions to the global warming in different regions.

Key words: northwestern China, REOF, PDSI, westerly, monsoon, dry-wet condition

ZHANG Yong, CHEN Fahu, GOU Xiaohua, JIN Linya, TIAN Qinhua,WANG Yousheng, PENG Jianfeng. The Temporal and Spatial Distribution of Seasonal Dry- Wet Changes over the Northwestern China: Based on PDSI[J].Acta Geographica Sinica, 2007, 62(11): 1142-1152.

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The Temporal and Spatial Distribution of Seasonal Dry- Wet Changes over the Northwestern China: Based on PDSI

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