A Parameterization for the Sensible Heat Exchange between Urban Canyon and The Atmosphere

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This paper investigates the behavior of the sensible heat exchange between the top of the canyon and outside atmosphere using a numerical model together with available field measurement data in a mid-latitude city. It was found that the heating characteristic of the urban canyon has close relationship with the narrowness index and outside wind velocity. The increase of the narrowness index and consequently, reduction of the sky-view factor leads to the reduction of sensible heat exchange between urban canyon and outside atmosphere. The increase of outside wind velocity makes the sensible heat exchange between the street canyon and outside atmosphere larger, and consequently cooler the urban canyon. A parameterization scheme was established which permits the evaluation of the sensible heat exchange between urban canyon and outside atmosphere based on the narrowness index, outside wind velocity and latitude of the city.