Ryo MORIWAKI, Takanobu MORIIZUMI and Manabu KANDA 1 正会員 博(工) 東京工業大学助手 理工学研究科土木工学専攻(〒152-8552 東京都目黒区大岡山二 丁目12-1) 2 学生会員 工修 東京工業大学 理工学研究科国際開発工学専攻(同上) 正会員 工博 東京工業大学助教授 理工学研究科国際開発工学専攻(同上) This paper shows the seasonal dependency of vertical profile of air temperature, CO 2 , and H 2 O within and above a suburban canopy and the turbulent diffusivity of the scalars. The results were derived from field measurements of the vertical profiles and fluxes, which were conducted in a residential area (the

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... n height of canopy is 7.3 m) of Tokyo, Japan. The vertical profile of CO 2 in the daytime drastically varied with the season; the CO 2 concentration within the canopy was lower than that above the canopy in summer but was slightly higher in winter. The seasonal change of the daytime CO 2 profile is likely due to the effect of photosynthesis by vegetation in backyards. The normalized turbulent diffusivity of air temperature and CO 2 depended on height and atmospheric stability, which is similar to that for vegetated canopies. In contrast, the normalized turbulent diffusivity of H 2 O was relatively smaller than that of heat and CO 2 . Although the correlation coefficients indicated that the transfer efficiencies of CO 2 were generally smaller than that of heat, the magnitude of normalized turbulent diffusivity of air temperature and CO 2 was almost same.