TY - JOUR
T1 - Impact of Wildfire Emissions on Chloride and Bromide Depletion in Marine Aerosol Particles
AU - Braun, Rachel A.
AU - Dadashazar, Hossein
AU - Macdonald, Alexander B.
AU - Aldhaif, Abdulamonam M.
AU - Maudlin, Lindsay C.
AU - Crosbie, Ewan
AU - Aghdam, Mojtaba Azadi
AU - Hossein Mardi, Ali
AU - Sorooshian, Armin
N1 - Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/8/15
Y1 - 2017/8/15
N2 - 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.
AB - 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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U2 - 10.1021/acs.est.7b02039
DO - 10.1021/acs.est.7b02039
M3 - Article
C2 - 28700243
AN - SCOPUS:85027451388
SN - 0013-936X
VL - 51
SP - 9013
EP - 9021
JO - Environmental Science and Technology
JF - Environmental Science and Technology
IS - 16
ER -