2008年青岛市一次典型大气外来源输送污染过程分析

以中国青岛市2008年5月27日至6月2日一次典型大气污染过程为例,利用美国国家环保中心全球再分析数据(水平分辨率为2.5°×2.5°)和美国国家海洋和大气局(NOAA)污染物轨迹模式HYSPLIT-4对此污染过程进行模拟分析。结果表明:大气环流形势对此次污染过程的发生及传输有显著影响,在500 hPa高空图上表现为一脊一槽型,使中国北方上空处于强的西北气流控制下,而地面图上生成于蒙古国的低气压气旋中心东移,产生的上升气流携带大量地表细粒子进入对流层;利用后向轨迹模式分析显示整个过程污染期受西北气流影响显著,而清洁期的气团源地主要为黄海。

A typical air pollution event caused by external source transport during 2008 in Qingdao,Shandong province

Based on the global reanalysis data (2.5°×2.5°) from the United States environmental protection center and back trajectory model (HYSPLIT-4) from NOAA, the typical air pollution event from May 27 to June 2, 2008 was simulated in Qingdao. The results show the effect of atmospheric circulation pattern on the air pollution event is significant. There is one ridge and one trough on the 500 hPa upper weather chart. It makes the upper of north China controlled by strong northwest airflow. The center of cyclone formed in Mongolia moves eastward on the surface weather chart, which produces ascending airflow. The airflow carries a lot of surface fine particles into troposphere. The back trajectory analysis indicates that the effect of northwest airflow on the pollution event is significant during pollution period, while the source of air mass is mainly from the Yellow sea during non-pollution period.