Abstract
A laboratory experiment was 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 by fitting a logarithmic law to the vertical profile of the concentration of CO2 in the air. The dissolved CO2 concentration was measured by using a gas-liquid equilibrator made of hydrophobic porous tube. The local gas transfer velocity was obtained form the results of the flux and dissolved CO2 measurements. For the parameterization, two dimensionless parameters, gx/μ*w2 and μ*w3/gvw were derived from a dimensional analysis, where μ*w is the friction velocity on the water side, g the gravitational acceleration, x the fetch and Vw the kinematic viscosity for the water. On the basis of the experimental results and the dimensional analysis, we proposed a new empirical formul a for the gas transfer velocity of CO2 in consideration of the fetch dependence.
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