Variation and Transportation Characteristics of SO_2 in Winter over Beijing and Its Surrounding Areas
Variation and Transportation Characteristics of SO_2 in Winter over Beijing and Its Surrounding Areas
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发表时间：
2009
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通讯作者：
Xiao-yan Meng
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作者：
Xiao-yan Meng
以北京市2008年奥运会空气质量保障规划项目“北京及周边地区大气污染物迁移转化及北京市空气质量目标研究”为依托，用两种先进的差分吸收光谱仪对SO2浓度进行了连续观测香河大气综合观测站大气物理研究所的差分光学吸收光谱仪和气体分析仪，2007年1月15-27日中国科学院兴隆大气成分背景值。同时，气象观测采用常规方法，在32 m塔上配备一套气象仪器进行气象观测，并通过系留气球获取气象参数剖面。根据这些站点的观测资料，分析了北京及周边地区SO_2污染的过程、变化、输送、排放及其与天气过程或条件的关系。结果表明：1）三个站点的日变化都很明显，且趋势一致。这意味着，对于北京及其周边地区来说，它通常处于同一天气系统的控制之下。因此，SO2污染是区域性的。2)SO2浓度日变化明显，夜间最高，1500 LST时最低。3)SO2浓度的变化与大气稳定度、风速和风向有着密切的关系。风速和大气稳定度越小，SO2浓度越高。SO2浓度偏高的方向是西南方向。4)后向轨道模式HYSPLIT和OMI SO2反演的模拟结果表明，来自周边地区的SO2长路径输送不可忽略。
Taking the advantage of the project "The study of the transportation and transformation of air pollutants in Beijing and its surrounding areas and the objective of air quality in Beijing", which is of the program of air quality assurance for Beijing 2008 Olympic Games, the continuous observations of SO2 concentrations were made with two advanced DOAS(Differencial Optical Absorption Spectroscopy) instruments and a gas analyzer in the premises of the Institute of Atmospheric Physics, Xianghe Atmospheric Integrated Observatory, and Xinglong Atmospheric Composition Background of Chinese Academy of Sciences during 15-27 January 2007. Meanwhile, the meteorological observations were conventionally made with the 32 m tower equipped with a set of meteorological instruments, and the meteorological parameter profiles were obtained by tethered balloons. Based on the measurements in these sites, the aspects of processes, variations, transportations, emissions of the SO2 pollution in Beijing and its surrounding areas, and its relationships with weather processes or conditions, are analyzed. The results are as follows: 1) The daily variations in the three sites are obvious and the tendency is the same. This implies that for Beijing and its surrounding areas, it is usually under the control of the same weather system. Therefore, SO2 pollution is regional. 2) The SO2 concentration has an obvious diurnal variation with the highest concentration at night and lowest at 1500 LST. 3) There is a close relationship between the variation of SO2 concentration and atmospheric stability, wind speed and wind direction. The smaller the wind speed and atmosphere stability is, the higher SO2 concentration is. Higher SO2 concentration is from southwest direction. 4) Simulations of the backward trajectory model HYSPLIT and OMI SO2 retrievals indicate that long path transportation of SO2 from surrounding areas can not be neglected.