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Modelling and analysis of the atmospheric nitrogen deposition in North Carolina

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Author Info
Sharon B. Phillips
Viney P. Aneja
Daiwen Kang
S. Pal Arya
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, NO>SUB align=right>>SMALL>2>/SMALL>>/SUB>, and NO>SUB align=right>>SMALL>Y>/SMALL>>/SUB> depicted the model's capability to evaluate various process contributions. Dry deposition of NH>SUB align=right>>SMALL>3>/SMALL>>/SUB> contributed 34.2 ± 57.9 µg N m>SUP align=right>>SMALL>-2>/SMALL>>/SUP> hr>SUP align=right>>SMALL>-1>/SMALL>>/SUP>; whereas HNO>SUB align=right>>SMALL>3>/SMALL>>/SUB> contributed slightly larger dry deposition of nitrogen, 35.2 ± 16.0 µg N m>SUP align=right>>SMALL>-2>/SMALL>>/SUP> hr>SUP align=right>>SMALL>-1>/SMALL>>/SUP>, in NC. NH>SUB align=right>>SMALL>4>/SMALL>>/SUB>>SUP align=right>>SMALL>+>/SMALL>>/SUP> and NO>SUB align=right>>SMALL>3>/SMALL>>/SUB>>SUP align=right>>SMALL>->/SMALL>>/SUP> hourly-averaged wet deposition fluxes were calculated as 37.3 ± 19.7 µg N >SUP align=right>>SMALL>-2>/SMALL>>/SUP> hr>SUP align=right>>SMALL>-1>/SMALL>>/SUP> and 40.6 ± 11.8 µg N m>SUP align=right>>SMALL>-2>/SMALL>>/SUP> hr>SUP align=right>>SMALL>-1>/SMALL>>/SUP>, respectively. Examination of total nitrogen deposition during the summer season in NC found that NH>SUB align=right>>SMALL>3>/SMALL>>/SUB> contributes approximately 50% of the dry deposition and NO>SUB align=right>>SMALL>3>/SMALL>>/SUB>>SUP align=right>>SMALL>->/SMALL>>/SUP> contributes approximately 50% of the wet deposition.

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Publisher Info
Article provided by Inderscience Enterprises Ltd in its journal International Journal of Global Environmental Issues.

Volume (Year): 6 (2006)
Issue (Month): 2 (January)
Pages: 231-252
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Handle: RePEc:mes:ijgenv:v:6:y:2006:i:2:p:231-252

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Web page: http://inderscience.metapress.com/link.asp?target=journal&id=110856

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Related research
Keywords: ammonia; CMAQ model; Community Multiscale Air Quality model; dry deposition; flux; modelling; nitrogen concentration; wet deposition; air pollution;

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