Urban coolisland effects and their quantitative evaluations in accordance with areal size

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In order to estimate the temperature relationship between the green space in the city and its land cover, long term temperature was observed continuously in the 11 parks (Imperial Palace, Meiji Jingu and Yoyogi park, Shinjuku Imperial Gardens, Shizen-Kyoikuen, Koishikawa Botanical Garden, Koishikawa Kourakuen Garden, Shiba park, Toyama park, Rikugien Garden, Shinjuku ward Kansenen park, Minato ward Prince Arisugawa Memorial park) in Tokyo in the summer of 2006.As a result, the following results were obtained.1) Temperature data in the major green parks in Tokyo were obtained based on the field observations. The climatic effects of green spaces in the city for thermal conditions became clear. For example, the temperature difference between the inside and outside of the green spaces in summer season was at most about 5 degree Celsius.2) The temperature difference between the inside and outside of the green space was approximated by the curve of the logarithm of the gross area of the green space or the forest area of the green space. This study could contribute the SLOSS (Single Large Or Several Small) problem, which is a problem in discussing the thermal effect of the green space in the city in recent years. Moreover, this research proposed a new index based on the size and the rate of the forest area, and that was able to explain the temperature difference between the inside and outside of the green spaces.3) The time-series behavior of the magnitude of the land cover's contributing rate of the temperature difference was shown by the multiple regression analysis based on the higher time resolution observation in this study.