西南地区夏季云量与降水的关系特征分析  

Contemporaneous Relationships between Summer Cloudiness and Precipitation over Southwest China

作　　者：李跃清[1] 张琪[1,2] 

机构地区：[1]中国气象局成都高原气象研究所,成都610072 [2]四川省气象台,成都610072

出　　处：《自然资源学报》2014年第3期441-453,共13页Journal of Natural Resources

基　　金：国家公益性行业(气象)科研专项经费项目(GYHY201006053);国家重点基础研究发展计划项目(2012CB417200);四川省应用技术研究与开发项目(2008NG0009)

摘　　要：论文利用我国西南地区地面降水资料和ISCCP D2云资料,通过SVD、合成分析等方法,分析研究了该区域夏季雨层云、高层云、深对流云与降水量、雨日的关系。结果表明:西南的贵州、重庆地区夏季的雨层云与雨日、雨量具有较好的关系,尤其是与雨日的相关系数高达0.73。除云南中、西部地区外,西南其余地区夏季高层云与雨量、雨日具有较好的关系,且相关系数与雨层云接近,反映此地区发生降水时,一般是雨层云和高层云相伴存在。夏季的深对流云也与雨量、雨日具有较好的关系,由于深对流云常产生阵性强降水,对降水量贡献较大,所以与雨量关系更为显著,其相关系数高达0.86,并且在三种降水性云系中与降水关系最好。Based on the meterological monthly rainfall dataset of 97 stations and ISCCP D2 data, using the SVD, statistical analysis and synthetic analysis methods, the relationships between nimbostratus, altostratus, deep convective cloud and precipitation and rain days are analyzed for 85 stations in Southwest China during summer of 1984 to 2005. The research results show that the summer nimbostratus is positively correlated with precipitation and rain days in Guizhou and Chongqing, especially the correlation coefficient with rain days reaches as high as 0.73. Except western and central Yunnan, there are obviously positive relations between summer altostratus and precipitation and rain days in the remaining parts of Southwest China, and the correlation coefficient is consistent with that of nimbostratus with percipitation and rain days. The results reflect that the pattern of altostratus and nimbostratus coexistence may favor the flood of those areas. At the same time, the correlation coefficients between deep convective cloud and precipitation and rain days are obvious in summer, and the correlation coefficients between deep convective cloud and precipitation is the bigger among those correlation coefficients and this correlation coefficient reaches as high as 0.86. It maybe because that deep convective cloud usually generates heavy rain showers and it makes a greater contribution to precipitation.

关 键 词：气候变化 雨层云 高层云 深对流云 降水 

分 类 号：P426[天文地球—大气科学及气象学]