Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 14, 3373-3395, 2014
http://www.atmos-chem-phys.net/14/3373/2014/
doi:10.5194/acp-14-3373-2014
© Author(s) 2014. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
04 Apr 2014
On the temperature dependence of organic reactivity, nitrogen oxides, ozone production, and the impact of emission controls in San Joaquin Valley, California
S. E. Pusede1, D. R. Gentner2, P. J. Wooldridge1, E. C. Browne1,a, A. W. Rollins1,b, K.-E. Min3,b, A. R. Russell1,c, J. Thomas4, L. Zhang4, W. H. Brune4, S. B. Henry5, J. P. DiGangi5,d, F. N. Keutsch5, S. A. Harrold6, J. A. Thornton6, M. R. Beaver7,e, J. M. St. Clair7, P. O. Wennberg7, J. Sanders8, X. Ren8,f, T. C. VandenBoer9,g, M. Z. Markovic9,b, A. Guha10, R. Weber10, A. H. Goldstein2,10, and R. C. Cohen1,3 1Department of Chemistry, University of California Berkeley, Berkeley, California, USA
2Department of Civil and Environmental Engineering, University of California Berkeley, Berkeley, California, USA
3Department of Earth and Planetary Sciences, University of California Berkeley, Berkeley, California, USA
4Department of Meteorology, Pennsylvania State University, University Park, Pennsylvania, USA
5Department of Chemistry, University of Wisconsin Madison, Madison, Wisconsin, USA
6Department of Atmospheric Sciences, University of Washington, Seattle, Washington, USA
7Divisions of Engineering and Applied Science and Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USA
8Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida, USA
9Department of Chemistry, University of Toronto, Toronto, Ontario, Canada
10Department of Environmental Science, Policy, and Management, University of California Berkeley, Berkeley, California, USA
anow at: Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
bnow at: Earth System Research Laboratory, National Oceanic and Atmospheric Administration and Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, USA
cnow at: Sonoma Technology, Petaluma, California, USA
dnow at: Department of Civil and Environmental Engineering, Princeton University, Princeton, New Jersey, USA
enow at: National Exposure Research Laboratory, Environmental Protection Agency, Research Triangle Park, North Carolina, USA
fnow at: Air Resources Laboratory, National Oceanic and Atmospheric Administration, College Park, Maryland, USA
gnow at: Department of Chemistry and Department of Earth Science, Memorial University of Newfoundland, St. John's, Newfoundland, Canada
Abstract. The 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.

Citation: Pusede, 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, doi:10.5194/acp-14-3373-2014, 2014.
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