Potential Overwater Transport of Near Surface Ozone from Proposed Offshore Oil and Gas Development in the Caspian Sea Region
Resulting ozone concentrations were examined in terms of one-hour and eight-hour maximum onshore and offshore concentrations. In addition, the AOT40 metric for cumulative exposure of vegetation to daytime ozone over 40ppb was calculated for both the maximum five-day exposure and over the full three month period. Model results show order of magnitude differences in horizontal transport of ozone plumes between over land and over water regimes, reflecting the respective difference in surface deposition between land and water. Results have important implication for offshore exposure of workers in settings such as oil platforms or fishing fleets and for exposure of population and vegetation in coastal regions at distances in excess of 100 km from emissions sources.