Variability in Nocturnal Nitrogen Oxide Processing and Its Role in Regional Air Quality
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- 6 January 2006
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 311 (5757) , 67-70
- https://doi.org/10.1126/science.1120120
Abstract
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, N 2 O 5 . We report aircraft measurements of NO 3 and N 2 O 5 , which show that the N 2 O 5 uptake coefficient, g(N 2 O 5 ), 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.Keywords
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