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| A numerical simulate study of the pollution incident of the PM2.5 pollutant island in the summer of Nanjing |
| YANG Peng, ZHU Bin, GAO Jin-hui, KANG Han-qing, ZHANG Liang, WANG Hong-lei, LI Yue-e |
| Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China |
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Abstract A small scale, gusty aerosol pollution incident occurred from June 23 to 24, 2013 in Nanjing and its surrounding areas where the average concentration of PM2.5 reached 242.25 μg/m3, which was uncommon in clear summer time. The WRF-chem model was used to simulate the PM2.5 pollution incident and the results showed that the pollution incident was directly related to the weather situation and the boundary layer structure. The pollution occured in Jianghuai region during the rainy season with a Jianghuai low level shear line lay near the convergence of airflow in Nanjing and its surrounding areas. Emissions from the upstream source region in the east and the stable local wind field led to the accumulation of pollutants in Nanjing. There was a stronger gas-particle conversion and the concentration of PM2.5 showed a decrease of 9.8% and 7.3% when SO2 and NOx emission was cut in half respectively. During the pollution period, the vertical temperature gradient was small over Nanjing and the temperature stratification was not conducive to the vertical diffusion of pollutants. As the boundary layer height was low and atmospheric turbulence in low layer was weak, the stable stratification was also favor of the pollutant accumulation.
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Received: 10 August 2015
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