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Environ Sci Technol. 2017 Aug 15;51(16):9013-9021. doi: 10.1021/acs.est.7b02039. Epub 2017 Jul 27.

Impact of Wildfire Emissions on Chloride and Bromide Depletion in Marine Aerosol Particles.

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Department of Chemical and Environmental Engineering, University of Arizona , Tucson, Arizona 85721, United States.
Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University , Raleigh, North Carolina 27695, United States.
National Aeronautics and Space Administration Langley Research Center, Chemistry and Dynamics Branch , Hampton, Virginia 23666, United States.
Universities Space Research Association , Columbia, Maryland 21046, United States.
Department of Hydrology and Atmospheric Sciences, University of Arizona , Tucson, Arizona 85721, United States.


This work examines particulate chloride (Cl-) and bromide (Br-) depletion in marine aerosol particles influenced by wildfires at a coastal California site in the summers of 2013 and 2016. Chloride exhibited a dominant coarse mode due to sea salt influence, with substantially diminished concentrations during fire periods as compared to nonfire periods. Bromide exhibited a peak in the submicrometer range during fire and nonfire periods, with an additional supermicrometer peak in the latter periods. Chloride and Br- depletions were enhanced during fire periods as compared to nonfire periods. The highest observed %Cl- depletion occurred in the submicrometer range, with maximum values of 98.9% (0.32-0.56 μm) and 85.6% (0.56-1 μm) during fire and nonfire periods, respectively. The highest %Br- depletion occurred in the supermicrometer range during fire and nonfire periods with peak depletion between 1.8-3.2 μm (78.8% and 58.6%, respectively). When accounting for the neutralization of sulfate by ammonium, organic acid particles showed the greatest influence on Cl- depletion in the submicrometer range. These results have implications for aerosol hygroscopicity and radiative forcing in areas with wildfire influence owing to depletion effects on composition.

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