Abstract
Urban heat island (UHI) is generally considered to be one of the major problems to human beings due to accelerated urban growth and anthropogenic heat release. To further investigate the cause of UHI, an improved Zero-dimensional City Air Temperature (zCAT) model was proposed for analyzing urbanization effect on urban thermal environment and applied to the city of Hong Kong. Comparison of model result with measured meteorology data revealed that the improved model was able to predict daily varying urban air temperature with good accuracy, with insignificant effect on the model performance based on different weather condition. We conclude that building height and plan area ratio play an important role on daily cycle of urban air temperature.
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