Abstract
The purpose of the present study is to indicate the temporal variation trend in urban temperature, and the relationship between heat island intensity and population in various cities in China. The extraction of the temporal variation trend in urban temperature according to urbanization is conducted by applying principal component analysis to the time series of monthly mean temperature of twelve months for fifty years. Then, the estimation of heat island intensity in each city is attempted by an original method. The estimated heat island intensity, i.e., amount of the temperature rise according to urbanization, concerning the mean temperature obtained from one observation point by this method is corresponding to the temperature difference between inside and outside of the built-up area of Beijing. The heat island intensity in various cities in China is presumed by this method, and then the relationship to the urban population is examined. As a result, it is confirmed that heat island intensity and urban population in China are in good relation.
