北京地区一次大气环境持续严重污染过程中SO_2的垂直分布分析

Analysis for Vertical Profile of Atmospheric SO_2 During Air Seriously Polluted Days in Beijing

在2004-09-27～2004-10-12期间，以325m气象与环境观测塔为平台，使用43CTL型高精度脉冲荧光SO2分析仪，分别布置在观测塔8m、47m、120m和280m 4层观测平台，对大气中的SO2气体浓度、PM10和PM2.5粒子质量浓度及同步气象因素进行了垂直梯度、连续观测．结合气象数据分析了观测期间大气中SO2气体浓度的垂直梯度分布及变化形势，进行了SO2浓度与混合层高度变化、海平面气压变化，风速、风向变化等要素的相关分析，观测到在实验期间大气边界层中SO2浓度由上向下递减分布的现象．由于地形与污染源分布的影响，北风最有利于污染扩散等状况．观测期间捕捉到一次主要由气象因素造成的大气环境严重持续污染及污染清除的全过程．

The concentration of SO2 was observed continuously from Sep 27,2004 to Oct 12,2004 in Beijing. We used the trace level pulsed fluorescence SO2 analyzers to measure this pollutant in air. The four SO2 analyzers were placed in four different levels （8m, 47m, 120m and 280m） of the 325m tall meteorologic observation tower. According to the meteorology data and the concentration of SO2, PM10, PM2.5 that observed from the tower, the vertical profile and the consistence trend of atmospheric SO2 were analyzed, and also found out the dependence relation between the consistence trend and the meteorological factors such as mix level altitude, air pressure, wind speed,and wind direction. Some air highly polluted days which caused by the meteorology was observed.