Organonitrate group concentrations in submicron particles with high nitrate and organic fractions in coastal southern California |
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| Authors: | Douglas A Day Shang Liu Lynn M Russell Paul J Ziemann |
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| Institution: | 1. Scripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Drive, Mail Code 0221, La Jolla, CA 92093-0221, USA;2. Air Pollution Research Center and Department of Environmental Sciences, University of California, Riverside, CA 92521, USA;1. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China;2. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China;3. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China;4. Institute of Surface-Earth System Science, Tianjin University, Tianjin, 300072, China;1. Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, USA;2. Laboratory for Atmospheric Research, Department of Civil & Environmental Engineering, Washington State University, Pullman, WA, USA;3. Pacific Northwest National Laboratory, Richland, WA, USA;4. Aerodyne Research Inc., Billerica, MA, USA;5. Cooperative Institute for Environmental Sciences, University of Colorado at Boulder, Boulder, CO, USA;6. Now with National Science Foundation, Alexandria, VA, USA |
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| Abstract: | During wintertime measurements in coastal southern California, organonitrate groups accounted for up to 10% of organic mass (OM) in submicron particles. In this study, we report the calibrated absorptivity, the uncertainties in the calibrations, the detection limits for 12 and 24 h ambient sampling, and the multipeak retrieval algorithm for the method developed. Organonitrate groups were observed when both submicron particle-phase nitrate and OM concentrations exceeded 1 μg m?3. These high concentrations were associated with a mixed urban fossil fuel combustion source type that had potential source regions near Riverside and the South Coast Air Basin. The high frequency of these organonitrate observations contrasts with a number of studies of aerosol particles in other regions with more humid conditions, in which organonitrate groups were not detected and submicron sulfate concentrations exceeded those of nitrate. Our results suggest both that organonitrates form and/or exist in significant concentrations during polluted urban conditions and that their lifetime may be limited by hydrolysis in the particle phase. |
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