Conference paper Open Access

Variation of air--water gas transfer with wind stress and surface viscoelasticity

Frew, Nelson M.; Bock, Erik J.; McGillis, Wade R. ; Karachintsev, Andrey V.; Hara, Tetsu; Münsterer, Thomas; Jähne, Bernd

Previous parameterizations of gas transfer velocity have attempted to cast
this quantity as a function of wind speed or wind-stress. This study demonstrates
that the presence of a surface film is effective at reducing the gas
transfer velocity at constant wind-stress. Gas exchange experiments were
performed at WHOI and UH using annular wind-wave tanks of different
scales. Systematic variations of wind-stress and surfactant concentration
(Triton-X-100) were explored to determine their influence on gas transfer
velocity. Attempts to characterize the surface properties of the surfactant
solutions were performed using mechanically generated capillary-wave
packets. Results indicate a strong inverse relationship between gas transfer
velocity and enhanced wave damping.

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