中国西部雨季特征及高原季风对其影响的研究

摘要/Abstract

摘要： 利用中国西部269站侯降水资料,对西部的主雨季进行定义,并分析讨论了雨季的空间分布和时间变化特征,结果表明,西部雨季演变是从西北和东南两头开始,相向中部移动,结束期也是如此,两头早中间迟。新疆的主雨季不明显;将西部雨季主要划分为北疆、南疆、高原西部、高原东部、东南区、东北区等6个区。各区降水量逐侯时间变化的分布有3种形态:南疆、高原西部和东南区为单峰型,北疆和高原东部为双峰型,东北区为三峰型。高原东侧和内蒙古西部雨季开始期推迟,结束期提前,雨季有变短趋势,西部其余地方相反,开始期提前,雨季有变长趋势。西部雨季开始期与结束期的年代际变化有同位相振动特征,即两者同时提前或推迟。初步分析了高原季风对西部雨季的影响。

关键词: 雨季, 高原季风, 中国西部

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.

Key words: rainy season, Plateau monsoon, western China

中图分类号:

P426.61

陈少勇;林纾;王劲松;吴洁. 中国西部雨季特征及高原季风对其影响的研究[J]. 中国沙漠, 2011, 31(3): 765-773.

CHEN Shao-yong;LIN Shu;WANG Jin-song;WU Jie. Rainy Season Characteristics in West China and Impact of the Plateau Monsoon[J]. JOURNAL OF DESERT RESEARCH, 2011, 31(3): 765-773.

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