Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 51, Issue 16, Pages 9013-9021Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.7b02039
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Funding
- Office of Naval Research grants [N00014-10-1-0811, N00014-16-1-2567]
- Dr. Shane Snyder's Laboratory at the University of Arizona
- Agilent Technologies
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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 mu m) and 85.6% (0.56-1 mu m) 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 mu m (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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