Conference paper Open Access

A laboratory study of the Schmidt number dependency of air-water gas transfer

Richter, Kerstin; Jähne, Bernd

Using a novel fast technique to measure gas transfer velocities, the dependency of gas transfer on the Schmidt number exponent n could be determined with a high precision. It was shown that the transition of n from a smooth (n = 2/3) to a rough (n = 1/2) surface extends over a larger range of wind speeds. The facet model assumes that an increasing fraction of exchange happens with an exponent of 1/2 and links this fraction with a physical property of the wave field, the mean squared slope. This new model could be successfully applied to gas exchange rates measurements in two different wind-wave facilities.

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