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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. Keywords; Heat island, Radiation Balance, Heat Flux, Rooftop Greening, Sedum 1. は じめ に 本研究では、様々な環境保全手法を取 り入れて平成12年 度に建設 された国立環境研究所地球温暖化研究 棟(4900m2、3F、RC構 造)において、放射 と熱の挙動に関す る通年モニタリングを実施 し、個別の環境保全 技術の環境負荷低減 性の比較検討および評価することを目的 としている。今回はその うち、屋上緑化面(セダ ム植栽)における放射収支観測、地中温度、地中熱貫流を観測 して分析することとした。 2. 観 測 手法 2.1 観測実施場所 観測実施場所は独立行政法人国立環境研究所地球温暖化研究棟(茨城県つくば市小野川16-2北 緯36° 02'53"、 東経140°07'27")の 屋上緑化面で、建物外観は図1に 示 したとお りである。また観測機器は 図2に 示す ように屋上緑化面上に設置 した。地球温暖化研究棟の屋上緑化面では斜面部分に植栽 したセダム *独 立行政法人国立環境研究所地球環境研究センター Center for Global Environmental Research, National Institute for Environmental Studies, Onogawa 16-2, Tsukuba-shi, Ibaraki, JAPAN 305-8506

Long-term Observation of Radiation Balance, Soil Temperature and Heat Flux at Eco-Building with Sedum Rooftop Greening Technology