近40年中国云量变化的分析

An Analysis of Cloudiness In China during 1950- 1988

本文以中美气候合作研究采用的“中华人民共和国的两个长期性仪器记录的气候数据库”为基础,分析了1950—1988年我国云量变化之概况.近40年来,除华南沿海和西南地区外,全国大部分地区云量有所减少.ENSO时间尺度和QBO的年际振荡在大部分地区有所反映.我们发现,3—4年尺度的振荡信号在60和70年代特别微弱,80年代又开始增强,和北半球60年代降温及80年代增温有良好的对应关系,表明了某些气象要素的年际变动和长期气候变化之间的一种可能联系.

The variations of cloudiness in five regions and the relationships between cloudiness and precipitation are analyzed. Decreasing trends in cloudiness were observed in most of the country, except the South China Coast and Southwest China regions. The ENSO and QBO time -scale fluctuations showed up in most regions. The oscillations of 3-4 year periods were very weak in the sixties and seventies and began enhancing in the eighties. It indicated a possible connection between the interannual variations of some meteorological elements and the long term climatic changes.