MITIGATING URBAN HEAT ISLAND: POSSIBILITY AND EFFECT OF REDUCING ANTHROPOGENIC HEAT EMISSION FROM VEHICLES AND BUILDINGS

摘要

Land use alteration and anthropogenic heat increase are the major causes of the urban heat island over the Tokyo metropolitan area. In the area, cities sprawl out to suburbs and inland cities are suffering from severe heat problems as well as the central Tokyo. Although several works focused on the impact of anthropogenic heat on the temperature field over the central Tokyo area; e.g., Kimura & Takahashi (1991), no works are carried out for the future prediction giving possible changes in the anthropogenic heat emission derived from plausible scenarios of energy demand increase and energy savings. However, the strategy of heat island mitigation has to be set considering future scenarios of energy use changes and the impact over the entire region. In this study, the spatial and temporal distributions of present and future anthropogenic heat emission are quantified. Future prediction was carried out according to the scenarios for the future demand increases and the adoption of possible energy saving actions. Then a mesoscale model was employed to estimate the impact of future changes of anthropogenic heat emission.