保定大雾的时空分布特征分析

利用保定19个观测站1974～2010年的大雾资料,对保定地区大雾的时空分布特征进行分析。结果表明,保定的雾日分布存在明显的季节差异,呈现出秋冬多、春夏少的特征,12月最多,5、6月最少;保定雾日的地理分布呈东部平原多、西部山区少的格局。对19个观测站的大雾资料进行经验正交函数(EOF)展开分析,前3个特征向量的累积方差贡献率为78.6%,第1特征向量大致代表了保定地区雾的总体分布,东部平原的安新、望都附近第1、第2特征向量均是高值区,说明这一区域大多数年份雾日较多。

Analysis of Spatial and Temporal Characteristics of Fog in Baoding

Based on the fog data of 19 observation stations during 1974-2010 in Baoding,the spatial and temporal characteristics of fog in Baoding area were analyzed.Results showed that fog days in Baoding are of obvious seasonal and inter-monthly variation,which are more in autumn and winter while less in spring and summer,the most in December while the least in May and June.The fog days of Baoding are more in east plain area and less in west mountainous area.According to the EOF analysis of the fog data in 19 stations,the accumulative variance contribution rate of the first three eigenvectors account for 78.6% of the total.The first eigenvector represents the general distribution of fog.Around Anxin and Wangdu in east plain area,the first and the second eigenvectors have high values,indicating that there are many fog days in most of years in this region.