利用气象台站数据分析北京城郊气温和城市热岛(UHI)强度的年变化及风速对北京UHI的影响;同时分析北京5个城市站点UHI在不同季节的日变化特征。结果表明,近44 a来北京市区与郊区的多年平均气温和UHI强度均呈增加的趋势。风速的降低促进北京城区的UHI出现增加趋势。风速对UHI的季节变化影响也很显著。2005年北京UHI日变化呈现了明显的夜间强,午间弱的特征,尤以天安门和公主坟站点的UHI日变化明显;冬季UHI强度比其他季节相应时次的UHI都强,且冬季UHI日变化幅度最大,夏季日变化幅度最小。
The annual variation of intensity of urban heat island (UHI), the impact of wind speed on UHI, and the diurnal variations of five urban sites in different seasons were studied in the paper by using the meteorological data. The result shows that annual average temperature appears an increasing trend in Beijing urban and suburb areas for the past 44 years. The intensity of UHI also shows an increasing trend. There is a negative correlation between the UHI and synchronous wind speed in Beijing region, and the decrease of wind speed led to the increase of UHI intensity. Results also show that diurnal change of UHI of Beijing is significant in 2005, the UHI is strong at nigh and week in the noon. The strongest UHI appears generally in winter seasons and the amplitude of UHI diurnal variation in winter is the largest, and the smallest in summer.
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