セダムを植栽した屋上緑化面における放射収支、地中温度及びヒートフラックスの観測

抄録

Heat island phenomenon is recognized one of the serious problem in the large city. For the mitigation of thermal pollution in the city, rooftop greening technology for the office building is becoming popular in recent years. The long-term observation of radiation balance, soil temperature and heat flux in the CCRH (Climate Change Research Hall) at NIES (National Institute for Environmental Studies) started from the middle of September 2002. Diurnal soil temperature of bare land in fine day was 10 degrees Celsius higher than vegetated part in September and October, and fell rapidly after the sunset. On the other hand, the variation of soil temperature of the vegetated part was small and calm.
Soil temperature on the inclined part was higher than the flat, but the temperature difference between the inclined part and the flat extended from 2.1 degrees Celsius in September to 10.9 degrees Celsius in January at noon, because the effect of solar altitude between the inclined part and flat was obviously shown in winter.
Rooftop greening decreased the surface temperature and the temperature variation, the impact to the air temperature above the vegetated part was smaller than the ordinary building top.