成都市城市热岛效应分析

Characteristics of Urban Heat Island Effect of Chengdu

城市热岛效应是城市气候最显著的特征之一。基于地理信息系统和不同时次的遥感影像,探讨成都市地表温度、热岛强度、热岛等级的分布特征及其演变。结果表明：成都市热岛效应明显且夜间夏强冬弱,地表温度呈条状分布;日间城市多数区域属于弱热岛以上等级,中心城区偏向强热岛和极强热岛,夜间强热岛面积扩张,冬季热岛等级增加明显;2002~2012年,城市热岛等级增加,强热岛面积扩张,但存在昼夜和季节性差异。

Urban heat island effect is one of the most obvious characteristic of urban climate. Based on geographical in- formation system （GIS） and multi-time remote sensing data, the characteristic of urban heat island effect of Chengdu was studied from spatio-temproal scale according to land surface temperature, heat island intensity and the level of heat island. The results showed that： （1） The urban heat island effect in Chengdu was obvious, and the intensity was strong in summer and weak in winter at nighttime, and the land surface temperature appeared in strip shapes; （2） In daytime, the most part of Chengdu was feeble heat island or belonged to the higher grades. The level of heat island in central city was higher in winter, especially at nighttime, and the area of strong heat island expanded com- pared to that in daytime; （3）the level of heat island increased and the area of strong heat island expanded from 2002 to 2012, however, the change in heat island intensity and the level of heat island was different among seasons, and the change also was different in day and night time.