承德市干湿岛效应及其城市化影响分析

提出用城市站与郊区站相对湿度的差值作为干湿岛强度指标,利用趋势分析等统计分析方法,分析了承德市1964—2007年的空气湿度变化及城市化影响,结果表明：承德市近44 a空气湿度呈明显增加趋势,尤以近10 a最为明显,且由1988年以前的干岛特征逐渐转成了近10 a的湿岛特征,以夏季、秋季的湿岛效应最为明显,湿度场的明显变化主要来源于城市化影响。

Dry and moisture island effects and its responses to the urbanization in Chengde,Hebei province

Based on the differences of relative humidity between urban weather stations and suburb weather stations as the intensity index of dry and moisture islands, air humidity changes and its responses to the urbanization from 1964 to 2007 in Chengde were analyzed by the trend analysis method and other statistical methods. The results show that air humidity has an obvious increasing trend in the recent 44 years in Chengde, especially in the last 10 years. Furthermore, air humidity characteristics turns from dry island to moisture island since 1988. Moisture island effect is obvious in both summer and autumn. The significant changes of humidity field are mainly caused by the urbanization.