NITROGEN-OXIDES AND OZONE PRODUCTION IN THE NORTH-ATLANTIC MARINE BOUNDARY-LAYER

Measurements of reactive nitrogen gases (NO, NO2, NOy), as well as rel ated chemical (O-3, CO, aerosol black carbon, radon, selected nonmetha ne hydrocarbons) and meteorological parameters were made on board the R/V Malcolm Baldridge prior to and subsequent to the 1992 ASTEX (Atlan tic Stratocumulus Transition Experiment) in the North Atlantic Ocean d uring June and July 1992. Results showed indications of well-defined p lumes from North America and Europe from both chemistry and back traje ctory data. Elevated ozone concentrations were also observed in airmas ses from uninhabited continental regions. Chemical and meteorological data were incorporated into a simple photochemical model in which ozon e destruction predominated over generation. The principal reaction lea ding to ozone destruction was O(D-1) + H2O --> 2OH.