The main parameter affecting gas transfer in a purely wind-driven regime is the shear stress due to the wind field, given by the friction velocity u*a in the air flow over the water surface. This is related to the wind velocity U10 at the standard 10 m level, u*a = yCb U10. CD is the quadratic law drag coefficient, CD = (0.8 + 0.065 U10) x 10-3, representing an increasing roughness effect due to wave growth with increasing wind speed.
As summarized by Chu and Jirka, for low wind speeds, a linear relationship,
and for high wind speeds, a quadratic relationship,
with Kl in mday-1 and u*a in cms-1, represents a good approximation to data, coming mostly from laboratory experiments. Donelan and Wanninkhoff summarize some field data for large-scale ocean measurements for which the wind fields are usually highly variable, both in space and time.
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