Abstract
Using the portable thermal infrared camera, thermal infrared images were taken by an interval for ten minutes from Meiji-shrine/Yoyogi-park that was a large-scale green tract, and its peripheral area. We recognized a difference of the thermal inertia caused by the green tract and the artificial heat structure with the concrete and the asphalt which constituted urban area from the diurnal variation of surface temperatures provided from thermal infrared images had. The difference of surface temperature between the green tract and its peripheral area reached about 8°C at the maximum in the daytime. The green tract is the lowest in the daytime, and the surface temperature becomes high in the sheeting of concrete, the asphalt pavement, order of the iron roof as follows. The amount of heat radiation in the daytime became -7W/m2 by a maximum when we calculated it from average temperature of the ground altitude of 50m in the town area and the surface temperature of the green tract. And it became-10W/m2 by maximum in the nighttime. From these things, it became clear that mitigation effect for air temperature rise of the large-scale green tract was big.
