Abstract

Measurements of long-wave radiative flux divergence in the vertical were obtained from an above roof-level site in the urban area of Montreal, P.Q. Radiative flux divergence was observed in the 4–5.5 m layer above the roof on almost all occasions, but especially with weak air flow. Radiative cooling rates calculated from the radiation measurements were greater than actual air temperature cooling rates, and in reasonable agreement with previous rural results. The importance and implications of these findings in urban meteorology are discussed.

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