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河 川 にお ける水 面温 度 の 日変化 は下流部 に小 さ く,上 流 部 に大 きい とい う傾 向 を示 す。 Abstract: The author investigated the surface radiant temperature with types of land-use upon two thermal imageries which were obtained on Jan. 3 1975, with MSS boarded on aircrafts along the courses shown in Fig. 1 and the following Conclusions were obtained. 1) In all of the types of land-use (exposed ground, road, parking place, evergreen forest and vegetable) except of turf and water surface, surface radiant temperature in the central part of the metropolis is higher early in the morning, and lower in daytime, than in the suburbs. The range of these surface radiant temperature during about 5.5 hours (6:00 -11:30) expands with a distance from the central part of the metropolis to the suburbs. 2) In spite of the areal differentiation of the diurnal viriation of the surface radiant temperature, discriminant analysis on these data may suggest that above mentioned 7 types of land-use are clustered in to 3 groups, i.e., heavily artificially deformed group (exposed ground, road, parking place, vegetable and turf), slighly artificially deformed group (evergreen forest) and water surface group, and in heavily artificially deformed land-use group there is also regional differentiation of the diurnal variation of surface radiant temperature between central part of the area and its suburbs. 3) Above phenomenon seems to be a case of such climate in urban area as Heat-Island or Cool-Island, though the surface radiant temperature is not so high at 11:30 in the central part of the area because of the lack of the industrial activities for the New Year holidays. 4) Diurnal variation of the surface radiant temperature of exposed ground may be controlled by the ground water level or soil moisture. 5) It is clarified that there are areal differentiations of the range of the surface radiant temperature of water surface depending on such water-uses as river, pool, pond and sewerage, and such situations as upstream and downstream of the river.

Diurnal Variation of Surface Radiant Temperature Associated with Landuse in the Tokyo Metropolitan Area