Observations of the relationship between dew and radiation fog

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Abstract
A preliminary micrometeorological field study conducted on the campus of the State University of New York at Albany indicated that dew formation strongly influences the formation of fall radiation fog. The initiation of dewfall (moisture from the air transported downward) corresponded to the beginning of a dew‐point decrease at 2 m. Two methods of differentiating dewfall from distillation (soil moisture), both comprising the total dew, were attempted. During the 1974 autumn season in Albany, indications were that a slightly larger portion of the total dew was derived from the soil. In several case studies, radiation fog was either delayed or prevented by the removal of water vapor from the low levels through the mechanism of dewfall. From the observed low‐level vapor gradients and the measured dewfall, values of the eddy exchange coefficient K for water vapor were calculated. Small values of K, of the order of 100 cm2 s−1, were indicated.

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