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中文摘要：
根据1993～2003年北京地区气象台站7、8月的温度资料，分析研究了近10年来北京夏季城市热岛的变化及其环境效应．结果表明：北京夏季城市热岛的水平范围扩大到近郊区和远郊区的通州，分布特征也由“单中心”转变为“多中心”；平均热岛强度呈逐渐增强趋势，在夏季出现了强热岛；北京夏季出现热岛和强热岛的天数激增，7月最大热岛强度也呈逐年上升趋势；热岛的强度和水平分布都有明显的日变化；由于热岛效应使城区增温显著，北京夏季的高温日（Tmax≥35℃）也逐年增多．本文还指出朝阳区气象观测站由于周围高大植被的影响，观测资料已不具备城区代表性．同时也证明绿化对降低城市热岛效应是极为有效的．本文的研究成果对北京城市发展和规划有一定的科学参考价值．
英文摘要：
With observational temperature data of July and August in Beijing from 1993 to 2003, the interannual variability and the environment effect of the UHI （urban heat island） are studied. The results show that with the rapid development of Beijing, the UHI has expanded to the outskirts and the horizontal distribution of UHI is characterized by multi-center. In addition, the average UHI intensity gets stronger and even the strong UHI can be seen during summer. The days with UHI and strong UHI during summer increase, the horizontal distribution and the intensity of UHI show a daily variation. The intensity of the strongest UHI during July also increases year by year. Because the UHI can make the temperature rise evidently in the city, the hot days （Tmax≥35℃ ） in Beijing during summer increase accordingly. Furthermore, with the effect of surrounding vegetation the station in Chaoyang district is no longer representative. The result is a scientific reference for the development and planning of the Beijing city.
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