Abstract:

The authors studied distribution characteristics of time on intensity of urban heat island in Changsha City. The authors used the meteorological observation data from observation stations of the urban and suburban in Changsha City. By statistical analysis, the results showed that: (1) the annual average heat island intensity was 0.92℃, annual average changed between the 0.76-1.46℃ during the last 21 years from 1988 to 2008. (2) The seasonal variation of intensity of urban heat island manifested as that autumn was stronger than winter than spring than summer. (3)The intensity of urban heat island in nighttime was stronger than in daytime during summer season. The conclusion showed that: annual variation of intensity of urban heat island was consistent with the processing of urban construction. The temperatures of urban and suburban increased simultaneously, and the intensity of urban heat island had been enhancing year by year in the nearly 20 years, the reason were global warming and the impact of human activities.