Improvement of the modelling of daytime nitrogen oxide oxidation in plumes by using instantaneous plume dispersion parameters |
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| Institution: | 1. Unit of Environmental Chemistry and Interactions with Life, UCEIV EA4492, SFR Condorcet FR CNRS 3417, University of the Littoral Opal Coast, F-59140 Dunkerque, France;2. Centre Commun de Mesures, University of the Littoral Opal Coast, F-59140 Dunkerque, France;3. Atmo Hauts-de-France, F-59800 Lille, France;1. Escuela Técnica Superior de Ingeniería Agronómica, Alimentaria y de Biosistemas, Technical University of Madrid, Ciudad Universitaria, 28040 Madrid, Spain;2. Research Center for the Management of Environmental and Agricultural Risks (CEIGRAM), Universidad Politécnica de Madrid, Madrid 28040, Spain;3. UMR 7619 METIS, Sorbonne Université, CNRS, EPHE, 4 place Jussieu, 75005 Paris, France;1. Department of Natural Resources, TERI University, 10, Institutional Area, Vasant Kunj, New Delhi 110070, India;2. Department of Energy and Environment, TERI University, 10, Institutional Area, Vasant Kunj, New Delhi 110070, India;1. National Center for Atmospheric Research, Boulder, CO, 80307, USA;2. Research School of Biology, Australian National University, Canberra, Australia;3. Department of Environmental Science, Policy and Management, University of California, Berkeley, CA, 94720, USA;4. CSIRO Oceans and Atmosphere, Canberra, Australia |
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| Abstract: | The effect of concentration fluctuations on the modelling of non-linear chemical reactions in the atmosphere will be considerable when hourly mean dispersion parameters are used. This effect can be reduced by introducing instantaneous dispersion parameters, as will be shown in this paper for the modelling of the oxidation of NO emited into an O3 containing atmosphere.We used the results of atmospheric tracer gas experiments to derive the dimensions of the instanteneous plume. With these results model calculations were carried out for the NOO3 reaction. Results were compared with airborne measurements of NO oxidation in the plumes of Dutch power plants.The introduction of the instantaneous plume leads to better agreement between model calculations and measurements. It is also found that the deviation from photochemical equilibrium in the plume is considerably smaller when instantaneous, instead of hourly, mean dispersion parameters are used. The dimension of the instantaneous plume did not show a dependence on atmospheric stability. |
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