Modelling and analysis of the atmospheric nitrogen deposition in North Carolina

Sharon B. Phillips, Viney P. Aneja, Daiwen Kang and S. Pal Arya

International Journal of Global Environmental Issues, 2006, vol. 6, issue 2/3, 231-252

Abstract: The United States Environmental Protection Agency's Community Multiscale Air Quality (CMAQ) regional-scale model is used to study concentrations and dry deposition of nitrogen species in North Carolina (NC) during the summer season. Each modelled and measured species featured a similar diurnal trend. A process budget analysis (production and removal evaluation) of NO, NO₂, and NO_Y depicted the model's capability to evaluate various process contributions. Dry deposition of NH₃ contributed 34.2 ± 57.9 µg N m^-2 hr^-1; whereas HNO₃ contributed slightly larger dry deposition of nitrogen, 35.2 ± 16.0 µg N m^-2 hr^-1, in NC. NH₄⁺ and NO₃^- hourly-averaged wet deposition fluxes were calculated as 37.3 ± 19.7 µg N ^-2 hr^-1 and 40.6 ± 11.8 µg N m^-2 hr^-1, respectively. Examination of total nitrogen deposition during the summer season in NC found that NH₃ contributes approximately 50% of the dry deposition and NO₃^- contributes approximately 50% of the wet deposition.

Keywords: ammonia; CMAQ model; Community Multiscale Air Quality model; dry deposition; flux; modelling; nitrogen concentration; wet deposition; air pollution. (search for similar items in EconPapers)
Date: 2006
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