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Volume 14, issue 7
Atmos. Chem. Phys., 14, 3373-3395, 2014
https://doi.org/10.5194/acp-14-3373-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 14, 3373-3395, 2014
https://doi.org/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

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 S. E. Pusede et al.
  • 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.

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