Abstract
Laboratory experiments were made to parameterize the gas transfer velocity of CO2 at the surface of wind waves. The local flux of CO2 was estimated at several fetches in a wind-wave tank by using the profile method. The dissolved CO2 concentration on the water side was measured by using a gas-liquid equilibrator made of hydrophobic porous tube. The local gas transfer velocity was obtained from the flux and dissolved CO2 measurements. On the basis of the experimental results and the dimensional analysis, we proposed a new type of empirical expression for the gas transfer velocity of CO2. With the fetch relations for wind waves, the expression can be described in terms of local dimensionless wind-wave parameters.
