Secondary organic aerosol formation and transport |
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| Institution: | 1. Associate Unit CSIC–University of Huelva “Atmospheric Pollution”, Centre of Research in Sustainable Chemistry–CIQSO, University of Huelva, Campus de El Carmen s/n, 21071 Huelva, Spain;2. Department of Civil and Environmental, Universidad de la Costa, Calle 58 #55–66, 080002 Barranquilla, Colombia;3. Department of Earth Sciences, University of Huelva, Campus de El Carmen s/n, 21071 Huelva, Spain;1. State Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081, China;2. Beijing Weather Modification Center, Beijing 100089, China;3. Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang, 310027, China;4. Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089, China;5. Field Experiment Base of Cloud and Precipitation Research in North China, China Meteorological Administration, Beijing 101200, China;6. Beijing Key Laboratory of Cloud, Precipitation and Atmospheric Water Resources, Beijing 100089, China |
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| Abstract: | A Lagrangian trajectory model simulating the formation, transport and deposition of secondary organic aerosol is developed and applied to the Los Angeles area, for the air pollution episode of 27–28 August 1987. The predicted secondary organic aerosol on 28 August 1987 represents 15–22% of the measured particulate organic carbon at inland locations in the base case simulations, and 5–8% of that at coastal locations. A maximum secondary organic aerosol concentration of 6.8 μg m−3 is predicted for Claremont, CA, during this episode. On a daily average basis at Claremont about 46% of this secondary organic aerosol is predicted to be a result of the oxidation of non-toluene aromatics (xylenes, alkylbenzenes, etc.), 19% from toluene, 16% from biogenic hydrocarbons (α-pinene, ß-pinene, etc.), 15% from alkanes and 4% from alkenes. The major uncertainties in predicting secondary organic aerosol concentrations are the reactive organic gas emissions, the aerosol yields and the partitioning of the condensable gases between the two phases. Doubling the reactive organic gas (ROG) emissions results in an increase of the secondary organic aerosol predicted at Claremont by a factor of 2.3. Predicted secondary organic aerosol levels are less sensitive to changes in secondary organic aerosol deposition and NOx emissions than to ROG emissions. |
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