利用Hysplit模式探究长江三角洲冬春季霾的来源及其成因

Using Hysplit Model to Explore the Source and Cause of Winter and Spring Haze in the Yangtze River Delta

长江三角洲在城市化和工业化的发展中,车辆与工厂的废气排放大量增长,城市大气边界层的物理结构也发生了变化,且严重污染的霾事件频发。为了探究长三角地区霾的来源路径与其主要去路,研究利用Hysplit后向轨迹模式与统计方法,分析了长江三角洲2014年12月至2015年3月期间霾的来源路径与其成因,研究表明:该地的霾主要为非本地来源,且其成因主要与单一冷锋、锋面气旋、西南季风天气过程有关;利用Hysplit前向轨迹模式探究长江三角洲霾形成后的去路,总结发现其影响路径主要从东北方向扩散、抬升至对流层顶部后消散,并对这两种扩散方式进行了比较。

In the development of urbanization and industrialization in Yangtze River Delta,the toxic emission from vehicles and factories has been increasing and the physical structure of the atmospheric boundary layer of this area has been changing.What’s more,serious haze pollution incidents happen frequently.In order to study the haze’s source paths as well as its major leaving paths in Yangtze River Delta,our study use HYSPLIT Backward Trajectory Model and Statistics methods to analyze the haze’s source paths,its major leaving paths and their cause of formation in Yangtze River Delta during2014.12-2015.3.Our study shows that the haze inYangtze River Delta are mainly formed from other places and its cause of formation are closely related to single cold front,frontal cyclone and southwest monsoon.Our study also use HYSPLIT Forward Trajectory Modelto explore the leaving paths of the haze in in Yangtze River Delta after it is formed.The summary shows that there are two major paths.The first one diffused northeastward and the second one diffused after it was lift to the top of troposphere.Finally,our study made a contrast between these two ways.