内蒙古地区云量时空分布及变化趋势分析

Spatial-Temporal Distribution and Change Trend of Cloud Amount over Inner Mongolia

利用1983年7月至2001年9月ISCCP云气候资料集D2资料集内蒙古区域云资料和内蒙古地区117个地面观测站的多年月平均气温、降水资料,采用趋势分析方法分析了内蒙古地区总云量和高、中、低云量的时空分布和多年变化趋势,以及温度和降水的多年变化趋势。结果表明:内蒙古地区总云量、低云量、中云量呈自西向东逐渐增多,高云量自西南向东北逐渐减少的空间分布特征;19年来东部地区总云量呈增加趋势,中、西部地区总云量呈减少趋势,温度的升高可能是云量变化的原因之一,内蒙古东北部云量和降水量变化趋势一致。

To understand the characteristics of clouds over Inner Mongolia, the spatial-temporal distribution and change trends of total, high, middle, low cloud amounts and change trends of temperature and rainfall in Inner Mongolia are analyzed with the trend analysis method on the basis of ISCCP D2 data from July 1983 to September 2001 and monthly mean temperature data of the eastern Inner Mongolia. The results show that total, middle, low cloud amounts over Inner Mongolia increased from west to east, and high cloud amount decreased from southwest to northeast; from 1983 to 2001, cloud amount in the eastern Inner Mongolia increased, but decreased in the central and western parts. Analysis indicates that temperature change may be one of causes of the cloud amount change. The change trends of cloud amount and rainfall tend to be accordant in the northeastern Inner Mongolia.