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Abstract
Temperature measurements in very cold air above an open river surface indicate that in spite of very high temperature lapse rate (temperature of river, in the 2 cm. 10 cm, and 12 m levels arc + 0.5,- 14.0,- 15.3, and- 18.0° C respectively), the eddy conductivity is of the same order of magnitude as in extremely stable conditions (e. g. above a snow surface during nocturnal cooling).