摘要
利用中国西南地区85个测站1960-2005年的月平均云量资料,采用小波分析、线性趋势分析和SVD分析等方法,分析了我国西南地区云量的时空分布和变化趋势等特征。结果表明,西南地区云量变化具有明显的季节特征,冬、春和秋季总云量和低云量分布均呈"东多西少"型,夏季相反,呈"东少西多"型;总云量和低云量均呈减少趋势,并存在较明显的准8年周期变化。年平均总云量及夏季总云量在西南大部分地区呈逐年递减趋势,冬季总云量在川西高原西北部和云南南部、东部呈减少趋势。而低云量的变化趋势比较一致,主要在四川盆地呈减少趋势;西南地区的温度场与总云量场呈明显的负相关关系,但温度场与低云量场的相关关系不显著。
Through the wavelet analysis,linear trend analysis and SVD trend analysis methods and so on,the characteristics such as temporal and spatial distributions,variation tendency of cloud cover are analyzed,using the monthly mean cloud data at 85 observation stations in the Southwest China during the period from 1960 to 2005.The results show that the total cloud cover and the low cloud cover have obvious seasonal variations in southwest China.And in spring,autumn and winter,they are excessive in east and few in west.But the opposite is existent in summer.It can be also found that the total cloud cover and low cloud cover decrease in the past 46 years.And they have a quasi-eight-year changes in cycle.Additional,the annual mean total cloud cover and summer total cloud cover are yearly to decrease over the most of regions.The total cloud cover decrease in northwest of the West Sichuan Plateau,the south and east of Yunnan Province.At the same time,the low cloud cover decrease in Sichuan basin.The SVD analysis between temperature and total cloud cover shows that there is obvious negative correlation between temperature and total cloud in Southwest China,but the correlation between temperature and low cloud is not significant.
出处
《高原气象》
CSCD
北大核心
2011年第2期339-348,共10页
Plateau Meteorology
基金
公益性行业(气象)科研专项项目(GYHY201006053)
科技部国际科技合作项目(2007DFB20210)
四川省应用技术研究与开发项目(2008NG0009)
四川省教育厅科研项目(08zc042)共同资助
关键词
西南地区
总云量
低云量
小波分析
SVD分析
Southwest China
Total cloud cover
Low cloud cover
Wavelet analysis
SVD analysis
