Abstract
In this study we focused on the relationships between the vertical profiles of scalar within and above a suburban canopy and the cold-air subsidence locally generated within the canopy. The results were derived from the wintertime field measurements of the vertical profiles of CO2, air temperature, water vapor, and turbulent flows, which were conducted in a residential area (the mean height of canopy is 7.3 m) of Tokyo, Japan. Under stably stratified conditions, the CO2 concentration above the canopy decreased with height, while that within the canopy kept almost same level. This indicates that the CO2 emitted from the houses accumulated within the canopy. Such behavior was not found in H2O profile. The vertical profile of air temperature and observations on the surface temperature using a thermal infrared camera suggested that the cold air generated at roof level moved down to the ground level. The effect of ‘cold air subsidence’ within the canopy is the most plausible reason for the nighttime vertical profiles of CO2 and H2O.
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