Water-side turbulence enhancement of ozone deposition to the ocean

C. W. Fairall (1) , D. Helmig (2) , L. Ganzeveld (3) , J. Hare (4)

1 ESRL - NOAA Earth System Research Laboratory
2 INSTAAR - Institute of Arctic Alpine Research [University of Colorado Boulder]
3 MPIC - Max Planck Institute for Chemistry
4 CIRES - Cooperative Institute for Research in Environmental Sciences

A parameterization for the deposition velocity of an ocean-reactive atmospheric gas (such as ozone) is developed. The parameterization is based on integration of the turbulent-molecular transport equation (with a chemical source term) in the ocean. It extends previous work that only considered reactions within the oceanic molecular sublayer. The sensitivity of the ocean-side transport to reaction rate and wind forcing is examined. A more complicated case with a much more reactive thin surfactant layer is also considered. The full atmosphere-ocean deposition velocity is obtained by matching boundary conditions at the interface. For an assumed ocean reaction rate of 10³ s^-1, the enhancement for ozone deposition by oceanic turbulence is found to be up to a factor of three for meteorological data obtained in a recent cruise off the East Coast of the U.S.

Domaines: Océan, Atmosphère

C. W. Fairall, D. Helmig, L. Ganzeveld, J. Hare. Water-side turbulence enhancement of ozone deposition to the ocean. Atmospheric Chemistry and Physics Discussions, 2006, 6 (3), pp.5137-5162. ⟨hal-00301644⟩