Comparative Analysis on Meteorological Condition for Two Air Pollution Events from Crop Residue Burning

Based on the conventional observational data,satellite remote sensing data,main pollutants monitoring data and NCEP/NCAR reanalysis data,together with the airflow backward trajectory simulation method,comparative analysis is conducted on the atmospheric conditions,planetary boundary layer features,air pollutant sources and transport paths of the two serious air pollution events which respectively took place on 10 and 13 June 2011.The results show that the concentrations of PM_(2.5)display a more significant peak-valley variation during the two air pollution events,which result from crop residue burning. The event seen on 13 June has a longer duration and a stronger intensity than the event on 10 June.The weather situation and the physical quantity field of the event on 10 June are favourable for the rainfall, which plays a role in flushing the pollutants.However,the weather conditions on 13 June are conducive to accumulation of pollutants.Both of the boundary inversion layers are not obvious.Air mass backward trajectory simulation show that two air pollution events are caused by the transport of regional pollution due to crop residue burning in the central and north parts of Jiangsu Province.Moreover,the pollution sources for the event on 13 June probably include the south part of Jiangsu Province and part of Anhui Province additional as well.