Pollutant scavenging in a mesoscale meteorological model with quasi-spectral microphysics |
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| Authors: | N Chaumerliac R Rosset |
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| Institution: | (1) L.A.M.P./O.P.G.C., UA CNRS n° 267 Université de Clermont II, B.P. 45, 63170 Aubière, France |
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| Abstract: | Pollutant scavenging parameterizations have been combined with meteorological predictions in a three-dimensional mesoscale numerical model (1). This meteorological model with detailed quasi-spectral microphysics is well-suited to include gas and aerosol removal by cloud droplets and raindrops. Two-dimensional sensitivity tests have been performed for both meteorological and chemical scenarios. Both maritime and continental clouds over an idealized topography have been considered to determine their relative efficiencies for wet sulfur deposition. A second example deals with night-time nitric acid production which has been simulated in a case of moist advection. A threshold behaviour for NO3 disappearance at relative humidities above 60 % was observed in agreement with experiments. The results obtained through such idealized tests emphasize the need for simultaneous treatment of dynamical, microphysical and physicochemical processes. |
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