Journal
SCIENCE
Volume 311, Issue 5757, Pages 67-70Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1120120
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Nitrogen oxides in the lower troposphere catalyze the photochemical production of ozone (O-3) pollution during the day but react to form nitric acid, oxidize hydrocarbons, and remove O-3 at night. A key nocturnal reaction is the heterogeneous hydrolysis of dinitrogen pentoxide, N2O5. We report aircraft measurements of NO3 and N2O5, which show that the N2O5 uptake coefficient, gamma(N2O5), on aerosol particles is highly variable and depends strongly on aerosol composition, particularly sulfate content. The results have implications for the quantification of regional-scale O-3 production and suggest a stronger interaction between anthropogenic sulfur and nitrogen oxide emissions than previously recognized.
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