基于AVHRR的成都平原城市热岛效应演变趋势分析

Evolution Tendency Analysis of Urban Heat Island Effect on Chengdu Plain Based on AVHRR

作为城市气候主要特征之一的热岛效应有日渐明显的趋势，给城市发展和市民生活带来一系列负面影响。对2000～2006年春季下午NOAA气象卫星遥感数据的处理和分析发现，随着城市的扩张，成都平原城市热岛效应的规模呈扩大趋势。成都市区热岛强度一般为5℃-7℃，局部地方极值可达8℃以上；市中心区热岛强度相对减弱，东部工业区热岛高温区面积逐渐缩小，市区西南部热岛明显发展，致使2003年起热岛次高温区在二、三环路附近大致呈环状分布。热岛演变与近几年城市建设和改造活动密切相关。研究成果为政府相关部门缓解热岛效应、改善人居环境提供了参考依据。

Urban heat island, as one of the main characters of modern urban climate, is increasingly severe with the urbanization in recent years, resulting in a series of adverse impacts on urban development and the people＇s living. Based on the processing and analysis of NOAA/AVHRR data from 2000 to 2006, this paper indicates that urban heat island of Chengdu plain has a trend of enlargement. Heat island intensity in Chengdu city is generally between 5℃ and 7℃, and it could reach 8℃ or higher at some areas in spring afternoon; what is more, heat island intensity becomes weaker near the urban center, and the acreage of heat island in the eastern suburb is reduced, at the same time, the heat - island develops obviously in the southwest of the city. So the high-temperature region distributes approximately as a ring shape along highway belt near the 2nd and 3rd ring roads. It is commonly believed that heat island variation tendency is related to the urban construction and renovation activities. Achievements in scientific research can provide a useful reference to relieve the harm of urban heat island effect and improve the human settlement environment.