近20年来重庆市主城区地表热岛的时空变化研究

his paper compares and analyses the spatial-temporal change of land surface temperature (LST), surface heat island and relative intensity of surface heat island in central area of Chongqing city in 1988, 1993, 2001, 2007 and 2009 using thermal infrared date retrieving from TM and ETM+ images. The results are summarized in three aspects. ① Mean land surface temperature and the heat island intensity all increase from 1988 to 2001, then decrease gradually. High land surface heat shiftes gradually from central area to the periphery. From the point of view of spatial distribution, high temperature and surface heat island intensity show the evolution process of centralized → decentralized → centralized. ② The heat island intensity in the central area is weakened after 2001, but the heat island intensity in outside city clusters is increased obviously, as well as the belt area along the Yangtze river and Jialing river because of rapid development. ③ The reduced amplitude of heat island intensity in main urban area is almost equal to the increased amplitude of heat island intensity in external city clusters. Land surface temperature and the heat island intensity are consistent well with the rapid expansion of the city, and have significant features of group urban.