Study on Urban Heat Islands in Tokyo Metropolitan Area Using a Meteorological Mesoscale Model Incorporating an Urban Canopy Model
9.15 STUDY ON URBAN HEAT ISLANDS IN TOKYO METROPOLITAN AREA USING A METEOROLOGICAL MESOSCALE MODEL INCORPORATING AN URBAN CANOPY MODEL Ryozo Ooka*, Kazuya Harayama**, Shuzo Murakami***, Hiroaki Kondo**** *Institute of Industrial Science, University of Tokyo, Tokyo, Japan **Yamatake Corporation, Tokyo, Japan ***Faculty of Science and Technology, Keio Gijuku University, Yokohama, Japan ****National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan 1. Introduction thermal environments [3,4]. Although this model can The temperature increase due to urbanization, i.e. predict thermal the environment at pedestrian level urban heat islands, is becoming very serious in easily, it is not possible to consider the effect of local Japanese cities. Urban heat island phenom ena have climate due to the assumption of a horizontally been analyzed by many researchers. The three- homogeneous flow and temperature field. dimensional meteorological meso-scale model is often In this study, a meteorological meso-scale model used to solve the mechanism of urban heat islands based on the Mellor-Yamada model level 2.5 [5] which [1,2]. On the meso-scale analysis , which was originally incorporates the urban canopy model proposed by developed in order to predict the climate above the Kondo et al [3] as the boundary conditions (see Fig.1) surface boundary layer, a one-dimensional heat is developed to bridge the urban climate and urban balance model is usually used for the ground thermal environment. boundary conditions. In this conventional model, a roughness parameter is employed in order to present 2. Incorporating the Urban Canopy Model into the the effect of the building complex.
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