Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 6 3 2006 10.5194/acpd-6-5137-2006 http://www.atmos-chem-phys-discuss.net/6/5137/2006/ http://www.atmos-chem-phys-discuss.net/6/5137/2006/acpd-6-5137-2006.html http://www.atmos-chem-phys-discuss.net/6/5137/2006/acpd-6-5137-2006.pdf 5137 5162 2006-06-26 Water-side turbulence enhancement of ozone deposition to the ocean C. W. Fairall D. Helmig L. Ganzeveld J. Hare NOAA Earth Science Research Laboratory, Boulder, CO, USA INSTAAR, University of Colorado, Boulder, CO, USA Max-Planck Institute for Chemistry, Mainz, Germany CIRES, University of Colorado, Boulder, CO, USA now at: SOLAS International Project Office, University of East Anglia, Norwich, UK 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.