辽宁东部城市雾霾天气数值模拟

应用NCEP/NCAR再分析资料和MM5模拟分析了2010年冬季辽宁东部城市沈阳、抚顺、铁岭发生严重雾霾天气时天气系统特征。500 hPa位势高度场,处于弱暖脊的位置。850 h Pa位势高度场,受辐散、下沉气流的影响。地面风场上地面风向不一致,受辐散气流影响。在垂直剖面风场,地面上方有明显的位涡高值上升区,高度较低。在地面至高空的温度廓线,低空有明显的逆温,逆温层顶的高度较低。应用CALPUFF模拟雾霾天气和2010年冬季沈阳、抚顺、铁岭PM_(10)日平均浓度分布情况。12月19日—12月21日沈阳、抚顺、铁岭PM_(10)浓度分布向偏东、东南和西北方向扩散,和地面风向保持一致。整个冬季沈阳PM_(10)日平均浓度分布向偏南方向扩散,抚顺、铁岭PM_(10)日平均浓度向偏南、偏东方向扩散,铁岭PM_(10)扩散对抚顺有叠加影响。

Using the NCEP/NCAR reanalysis data and MM5 simulation analysis data,characteristics of synoptic system of serious gray haze weather in 2010 winter in eastern city of Liaoning,which is Shenyang,Fushun,and Tieling,were analyzed. The results show that Liaoning area is on the weak warm ridge position on 500 h Pa height field while it is influenced by sinking airflow on 850 h Pa height field. The surface wind on the ground disaccords with the divergence. Moreover,in vertical section on the wind field,as in lower layer the height of the vorticity high value area is lower and in upper layer there is a wide range of a vortex low value area,the ascend flow is weak and sinking airflow is strong. The temperature profile from surface to upper air presents that there is obviously temperature inversion in low altitude and the top of inversion is lower. PM_(10) daily average concentration distribution from Dec. 19 to 21 in 2010 in haze weather in Shenyang,Fushun and Tieling was simulated by CALPUFF. In accordance with wind direction on surface,PM_(10) daily average concentration distribution appears eastward,southeastward and Northwestward. In Shenyang,PM_(10) daily average concentration distribution appears southward,but in Fushun and Tieling it appears southward and eastward. PM_(10) daily average concentration distribution in Tieling has cumulated influence on Fushun.