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Estimation of dry deposition of atmospheric nitrogen to coastal waters of de la Plata River in front of Buenos Aires city

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The deposition of atmospheric nitrogen (N) to surface waters of de la Plata River downwind of Buenos Aires city has been estimated using atmospheric dispersion-deposition models. The CALPUFF model has been applied to point source emissions and the DAUMOD-RD model has been developed to evaluate the area source emission contributions. Annual N dry deposition is 31,763 kg-N yr−1 (≈ 18 kg-N km−2 yr−1). Nitrogen dioxide contribution to this value is 54% and nitric acid contribution is 46%. The maximum monthly N dry deposition fluxes vary between 7 kg-N km−2 month−1 (in February) and 13 kg-N km−2 month−1 (in December).

Keywords: dry deposition, nitric acid, nitrogen dioxide, atmospheric dispersion modelling, Buenos Aires, Argentina, atmospheric nitrogen, surface waters, water pollution, environmental pollution

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