西安城市热岛的时空分布特征

Distributive characters of urban heat island effect in Xi'an City

选取1959-2008年西安市常规气象站和城区加密自动站逐小时气温资料,采用城、郊气温对比法研究西安城市热岛效应的时间变化和空间分布。结果表明:西安城市热岛效应逐年增加,具有明显的季节变化特征;热岛强度日变化呈现双峰分布,两个峰值分别出现在05时和21时左右,最低值出现在11时左右。在西安市城区一直存在一个强城市强热岛中心和一个弱热岛中心;秋冬季西安市出现了多个热岛中心。

Basing the hourly temperature data of the automation weather station（AWS） and encryption AWS in Xi＇an city from 1959-2008,the temperatures between rural area and urban were compared.Results showed that urban heat island（UHI） intensify increased year by year.The diurnal change of urban heat island indicated that there were two peaks,and the minimum of the UHI intensity appeared at 11：00am.The UHI exhibited a spatial structure of multiple centers.