Abstract: Based on the NCEP/NCAR reanalysis data and the meso-scale weather model MM5, a pollution weather process in Shengyangfrom 14-19 January 2010 was simulated. Some meteorological elements were analyzed and simulated and these include the ground and upper air pressure fields, the horizontal and vertical wind fields from the ground to the upper level as well as their variation with time, and the vertical temperature profile etc.. The variation of weather system was described in this process, and the meteorological elements causing atmospheric pollution were analyzed. The results indicate that the corresponding ground filed in this process is the Changbai Mountain high pressure and topographic trough circulation type. The upper weather situation is two troughs and one ridge at 500 hPa. The ground wind field is controlled by high pressure divergence airflow. The horizontal wind fields from the ground to the upper all have the southerly wind shear and westerly wind shear, and there is the corresponding downdraft in the vertical wind field. The temperature profile shows a clearly inversion from the ground to the upper level. The above meteorological conditions together cause the persistent pollution weather, while the lasting weather situation with two troughs and one ridge at 500 hPa geopotential height field are the main reason of this process.

Key words: NCEP/NCAR reanalysis data, Pollution weather, Numerical simulation, Shenyang