Measurements of N2O5, NO2, and O3 east of the San Francisco Bay E. C. Wood1, T. H. Bertram1, P. J. Wooldridge1, and R. C. Cohen1,2,3 1Department of Chemistry, University of California, Berkeley, California 2Department of Earth and Planetary Sciences, University of California, Berkeley, California 3Energy and Environment Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, California
Abstract. We report in situ measurements of N2O5, NO2, and O3 in
Contra Costa County, California during January 2004. Mixing ratios of
N2O5, an intermediate compound in the atmosphere's nocturnal
cleansing process, ranged up to 200pmol/mol at night. The highest
N2O5 concentrations were correlated with low O3 and high
NO2 concentrations. The calculated steady state lifetime for
N2O5 ranged from 5 to 30min. The total HNO3 produced by
N2O5 hydrolysis over a 14h night was comparable to ambient
NO2 concentrations, and is estimated to be a factor of nine bigger than
the HNO3 produced during the day.
Citation: Wood, E. C., Bertram, T. H., Wooldridge, P. J., and Cohen, R. C.: Measurements of N2O5, NO2, and O3 east of the San Francisco Bay, Atmos. Chem. Phys., 5, 483-491, doi:10.5194/acp-5-483-2005, 2005.