Articles | Volume 17, issue 7
Atmos. Chem. Phys., 17, 4711–4730, 2017
Atmos. Chem. Phys., 17, 4711–4730, 2017

Research article 11 Apr 2017

Research article | 11 Apr 2017

Long-term air concentrations, wet deposition, and scavenging ratios of inorganic ions, HNO3, and SO2 and assessment of aerosol and precipitation acidity at Canadian rural locations

Irene Cheng and Leiming Zhang

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Current understanding of the driving mechanisms for spatiotemporal variations of atmospheric speciated mercury: a review
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Subject: Aerosols | Research Activity: Atmospheric Modelling | Altitude Range: Troposphere | Science Focus: Chemistry (chemical composition and reactions)
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Cited articles

Appel, K. W., Foley, K. M., Bash, J. O., Pinder, R. W., Dennis, R. L., Allen, D. J., and Pickering, K.: A multi-resolution assessment of the Community Multiscale Air Quality (CMAQ) model v4.7 wet deposition estimates for 2002–2006, Geosci. Model Dev., 4, 357–371,, 2011.
Bourcier, L., Masson, O., Laj, P., Chausse, P., Pichon, J. M., Paulat, P., Bertrand, G., and Sellegri, K.: A new method for assessing the aerosol to rain chemical composition relationships, Atmos. Res., 118, 295–303, 2012.
Cadle, S. H., VandeKopple, R., Mulawa, P. A., and Dasch, J. M.: Ambient concentrations, scavenging ratios, and source regions of acid related compounds and trace metals during winter in northern Michigan, Atmos. Environ., 24, 2981–2989, 1990.
Chang, T. Y.: Rain and snow scavenging of HNO3 vapor in the atmosphere, Atmos. Environ., 18, 191–197, 1984.
Cheng, I., Zhang, L., and Mao H.: Relative contributions of gaseous oxidized mercury and fine and coarse particle-bound mercury to mercury wet deposition at nine monitoring sites in North America, J. Geophys. Res.-Atmos., 120, 8549–8562, 2015.
Short summary
Geographical and long-term (1983–2011) trends in air concentrations and wet deposition of inorganic ions and aerosol and precipitation acidity were analyzed at 31 sites in Canada. Declines in atmospheric ammonium, nitrate, and sulfate were consistent with decreasing emissions of NH3, NOx, and SO2. A decline in nitrate and sulfate wet deposition was also observed. Wet scavenging was further studied by estimating scavenging ratios and relative contributions of gases and aerosols to wet deposition.
Final-revised paper