On the temperature dependence of organic reactivity, nitrogen oxides, ozone production, and the impact of emission controls in San Joaquin Valley, California

dc.contributor.authorPusede, S. E.
dc.contributor.authorGentner, D. R.
dc.contributor.authorWooldridge, P. J.
dc.contributor.authorBrowne, E. C.
dc.contributor.authorRollins, A. W.
dc.contributor.authorMin, K.-E.
dc.contributor.authorRussell, A. R.
dc.contributor.authorThomas, J.
dc.contributor.authorZhang, L.
dc.contributor.authorBrune, W. H.
dc.contributor.authorHenry, S. B.
dc.contributor.authorDiGangi, J. P.
dc.contributor.authorKeutsch, F. N.
dc.contributor.authorHarrold, S. A.
dc.contributor.authorThornton, J. A.
dc.contributor.authorBeaver, M. R.
dc.description.abstractThe San Joaquin Valley (SJV) experiences some of the worst ozone air quality in the US, frequently exceeding the California 8 h standard of 70.4 ppb. To improve our understanding of trends in the number of ozone violations in the SJV, we analyze observed relationships between organic reactivity, nitrogen oxides (NOₓ), and daily maximum temperature in the southern SJV using measurements made as part of California at the Nexus of Air Quality and Climate Change in 2010 (CalNex-SJV). We find the daytime speciated organic reactivity with respect to OH during CalNex-SJV has a temperature-independent portion with molecules typically associated with motor vehicles being the major component. At high temperatures, characteristic of days with high ozone, the largest portion of the total organic reactivity increases exponentially with temperature and is dominated by small, oxygenated organics and molecules that are unidentified. We use this simple temperature classification to consider changes in organic emissions over the last and next decade. With the CalNex-SJV observations as constraints, we examine the sensitivity of ozone production (PO₃) to future NOₓ and organic reactivity controls. We find that PO₃ is NOₓ-limited at all temperatures on weekends and on weekdays when daily maximum temperatures are greater than 29 °C. As a consequence, NOₓ reductions are the most effective control option for reducing the frequency of future ozone violations in the southern SJV.en_US
dc.description.sponsorshipThis work was funded by the California Air Resources Board (contract CARB 08-316) and by the National Aeronautics and Space Administration (grant NNX10AR36G). We are grateful to John Karlik, Rick Ramirez, and the entire University of California Kern County Extension for logistical support during the CalNex-SJV project. We thank David Parrish for useful comments on our manuscript. We acknowledge the California Air Resources Board and the San Joaquin Valley Unified Air Pollution Control District for the temperature and O3 data. The findings and discussions described in this paper are those of the authors and do not necessarily represent the views of our sponsors.en_US
dc.format.extent23 pagesen_US
dc.genrejournal articlesen_US
dc.identifier.citationPusede, S. E., Gentner, D. R., Wooldridge, P. J., Browne, E. C., Rollins, A. W., Min, K.-E., Russell, A. R., Thomas, J., Zhang, L., Brune, W. H., Henry, S. B., DiGangi, J. P., Keutsch, F. N., Harrold, S. A., Thornton, J. A., Beaver, M. R., St. Clair, J. M., Wennberg, P. O., Sanders, J., Ren, X., VandenBoer, T. C., Markovic, M. Z., Guha, A., Weber, R., Goldstein, A. H., and Cohen, R. C.: On the temperature dependence of organic reactivity, nitrogen oxides, ozone production, and the impact of emission controls in San Joaquin Valley, California, Atmos. Chem. Phys., 14, 3373–3395, https://doi.org/10.5194/acp-14-3373-2014, 2014.en_US
dc.publisherCopernicus Publicationsen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsAttribution 3.0 Unported*
dc.titleOn the temperature dependence of organic reactivity, nitrogen oxides, ozone production, and the impact of emission controls in San Joaquin Valley, Californiaen_US


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