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Simulation of a typical complex pollution process over Pearl River Delta area |
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Abstract This paper investigated the temporal and spatial variation of O3, NOx and visibility, and further analyzed the share of mass and the extinction contribution of each aerosol species, based on the simulation of a typical complex pollution process over Pearl River Delta area through the air quality modeling system (MM5-CAMQ-SMOKE).The spatial and temporal distribution of photochemical smog markers, as well as processes of haze initiating, weakening, and intensifying, could be well simulated by this modeling system. The PM2.5 contributed 79.8% of the PM10 mass concentration. The number concentration of nuclei of aitken mode and accumulation mode was higher than that of the coarse mode on the order of 103~104. Of all the aerosol masses, the sulfate contributed the highest fraction (31%) of the PM2.5 concentration, while black carbon, organic carbon, ammonium, and nitrate contributed 21%, 14%, 7.2% and 2%, respectively. The extinction contribution of secondary aerosol was more than 50% under averaged relative humidity condition, and more than 70% under high relative humidity condition. Therefore, visibility deterioration in this case was mainly caused by fine particles generated during various chemical processes over the Pearl River Delta region.
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Received: 08 May 2011
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