摘要
据1960—2009年606个气象台站总云量和低云量观测数据分析显示,我国总云量总体处于下降趋势,相对于20世纪60至70年代云覆盖年变化平稳阶段,1980 2009年全国平均总云量下降了0.6%,但长江以南沿海地区和新疆少部分地区总云量一直变化比较平稳。低云变化空间不均性差异较大,以四川盆地为中心区域50年间低云持续减少,从20世纪60年代开始,平均每10年年平均下降幅度达4.0%;长江以南、东北东部和新疆西部至青藏高原北部区域低云却增加了,平均每10年增加4.8%。
A decrease in average annual total cloud cover was observed from 1960—2009,based on data from 606 meteorological stations in China.Specifically,the cloud cover in 1980—2009 was 0.6%less than that in the period 1960—1970.In coastal areas of China south of the Yangtze River,a stable variation in total cloud cover was observed,however,a significant difference was observed in the spatial variability of low clouds.In the Sichuan Basin during 1960—2009 the low-cloud cover has decreased by approximately 4.0%every decade since 1960.The situation is different in other regions of China.For example,south of the Yangtze River,east of Northeast China,and west of Xinjiang to the northern of Qinghai-Tibetan Platean,low-cloud cover increases about 4.8%on average every decade since 1960.
出处
《气象》
CSCD
北大核心
2012年第1期90-95,共6页
Meteorological Monthly
基金
中国科学院创新项目(KZCX2-YW-Q03-3)
国家重点基础研究发展规划(973)项目(2006CB403607)
国家自然科学基金项目(40675047)共同资助
关键词
总云量
低云量
正交分解
变化趋势
total cloud cover
low-cloud cover
EOF decomposition
change in trend
