摘要
利用川渝地区34站1960-2006年共计47年的逐月降水量资料,采用经验正交函数(EOF)分解、旋转经验正交函数(REOF)分解、小波分析等方法详细讨论了川渝地区夏季降水量的时空变化特征。结果表明:川渝地区夏季降水量时空分布不均,川渝地区夏季降水量可以分为3个区,分别是川西高原区、盆地中部区和盆地东部区。近50年来,川渝地区夏季降水量具有显著不同的年代际变化特征,川西高原和盆地东部夏季降水量长期变化呈增加的趋势,而盆地中部呈减少的趋势。川渝各区夏季降水量具有显著不同的多时间尺度的周期变化特征,其中川西高原具有准15年和准5年的周期变化特征,盆地中部具有准14年、准6年和准3年的周期变化,盆地东部具有准16年、准8年和准3年的周期变化特征。
based on the monthly precipitation at 34 stations in Siehuan-Chongqing region from 1960 to 2006, the regional characteristics are investigated in terms of empirical orthogonal function （EOF）, rotated empirical orthogonal function （REOF）, wavelet analysis, and so on. The results show that the temporal-spatial variation of precipitation in summer is inhomogeneous in Sichuan-Chongqing region and it can be divided into three sections by precipitation as the west Sichuan plateau, the central basin area and the eastern basin area. In recent 50 years, the characteristics of inter-decadal variation of the precipitation in the 3 sections are very different as summer precipitation has an increas- ing long-term overall trend in west Sichuan plateau and east basin but a decreasing long-term trend in middle part. The rainy seasons and the oscillation periods of the precipitation are also different in the 3 sections in time-scale. The principal oscillation periods are quasi-15a and quasi-5a in west Sichuan plateau, quasi-14a, quasi-6a and quasi-3a in middle part and quasi-16a, quasi-8a and quasi-3a in east basin.
出处
《成都信息工程学院学报》
2010年第2期172-178,共7页
Journal of Chengdu University of Information Technology
关键词
气象学
气候特征
川渝地区
夏季降水
时空变化
雨季
meteorology
climatic characteristics
Sichuan-Chongqing region
precipitation in summer
temporal andspatial variation
rainy season
