P1.6
Observations of the chemical evolution of the Sacramento, CA urban plume
Jennifer G. Murphy, University of California, Berkeley, CA; and D. A. Day, P. A. Cleary, P. J. Wooldridge, D. B. Millet, M. McKay, G. W. Schade, A. H. Goldstein, and R. C. Cohen
The Sacramento Valley and the Mountain Counties to its East in California routinely violate the U.S. Federal 8-hour O3 standard between May and October. We describe observations of NO2, total peroxynitrates, total alkyl nitrates, HNO3 and a wide range of VOC and O3 at three sites along the outflow of the urban plume (2hrs, 6hrs and 7hrs downwind). We present an analysis of the weekend effect in O3 at several sites in the area for the last five years, showing that sites in the valley generally have higher weekend ozone while sites downwind have lower ozone. The measurements are used to examine our understanding of the chemical and transport processes responsible for the weekend/weekday differences in O3, biogenic VOC, NO2, HNO3, peroxynitrates and alkyl nitrates. Relationships among the hydrocarbons and ratios of oxidized nitrogen to NO2 will be used to compare and contrast HOx chemistry and the rate of ozone production on weekdays and weekends.
Poster Session 1, General Poster Session with Welcome Reception
Wednesday, 27 April 2005, 6:00 PM-6:00 PM, Mezzanine Level Lobby
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