Abstract:

Through linear trend and moving average method,the variation tendencies of heat island intensity(HII) represented by different temperature types were obtained in Anqing,Wuhu and Nanjing.Then a comparison analysis was made among them.On the basis of principal component analysis,regression models between HII and urbanization index were constructed.The result showed that there was negative correlation between urban scale and the variation velocity of HII represented by annual mean temperature and minmean temperature.However,the relationship between urban scale and the variation velocity of HII represented by annual max-mean temperature did not conform to this rule.Mediumscale city possessed maximum variation velocity of HII,while maximumscale city possessed minimum variation velocity.Cubic regression model all accorded with the relationship models between HII and urbanization index at utmost.Meanwhile,only the relationship model in mediumscale city owned characteristics of Kuznets curve.The main influence factors of heat island for different cities had obvious discrepancies,with economical level,population density and energy consumption for Anqing,urban population proportion,economic level and ecological condition for Wuhu,land use condition and abovementioned factors for Nanjing