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首页> 外文期刊>Atmospheric chemistry and physics >Investigations of temporal and spatial distribution of precursors SO2 and NO2 vertical columns in the North China Plain using mobile DOAS
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Investigations of temporal and spatial distribution of precursors SO2 and NO2 vertical columns in the North China Plain using mobile DOAS

机译：利用移动DOAS研究华北平原前体SO2和NO2垂直柱的时空分布

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Recently, Chinese cities have suffered severe events of haze air pollution, particularly in the North China Plain (NCP). Investigating the temporal and spatial distribution of pollutants, emissions, and pollution transport is necessary to better understand the effect of various sources on air quality. We report on mobile differential optical absorption spectroscopy (mobile DOAS) observations of precursors SO2 and NO2 vertical columns in the NCP in the summer of 2013 (from 11?June to 7?July) in this study. The different temporal and spatial distributions of SO2 and NO2 vertical column density (VCD) over this area are characterized under various wind fields. The results show that transport from the southern NCP strongly affects air quality in Beijing, and the transport route, particularly SO2 transport on the route of Shijiazhuang–Baoding–Beijing, is identified. In addition, the major contributors to SO2 along the route of Shijiazhuang–Baoding–Beijing are elevated sources compared to low area sources for the route of Dezhou–Cangzhou–Tianjin–Beijing; this is found using the interrelated analysis between in situ and mobile DOAS observations during the measurement periods. Furthermore, the discussions on hot spots near the city of JiNan show that average observed width of polluted air mass is 11.83 and 17.23?km associated with air mass diffusion, which is approximately 60?km away from emission sources based on geometrical estimation. Finally, a?reasonable agreement exists between the Ozone Monitoring Instrument (OMI) and mobile DOAS observations, with a correlation coefficient (R2) of 0.65 for NO2 VCDs. Both datasets also have a similar spatial pattern. The fitted slope of 0.55 is significantly less than unity, which can reflect the contamination of local sources, and OMI observations are needed to improve the sensitivities to the near-surface emission sources through improvements of the retrieval algorithm or the resolution of satellites.
机译：最近，中国城市遭受了严重的霾霾空气污染事件，特别是在华北平原（NCP）。为了更好地了解各种来源对空气质量的影响，有必要调查污染物，排放物和污染转移的时间和空间分布。在本研究中，我们报告了2013年夏季NCP中前体SO2和NO2垂直柱的移动差分光学吸收光谱法（mobile DOAS）观察结果。在各种风场下，该区域内SO2和NO2垂直塔密度（VCD）的不同时空分布特征。结果表明，来自南部NCP的运输对北京的空气质量有很大影响，并且确定了运输路线，尤其是石家庄—保定—北京路线上的SO2运输。此外，与德州-沧州-天津-北京路线的低面积排放源相比，石家庄-保定-北京路线沿线的二氧化硫的主要来源是升高的源。这是通过在测量期间在现场和移动DOAS观测之间进行的相关分析发现的。此外，关于济南市附近热点的讨论表明，与空气质量扩散相关的平均观测污染空气宽度为11.83和17.23？km，根据几何估计，其与排放源的距离约为60？km。最后，臭氧监测仪器（OMI）与移动式DOAS观测之间存在合理的协议，NO2 VCD的相关系数（R2）为0.65。两个数据集也具有相似的空间格局。拟合斜率0.55明显小于1，这可以反映本地污染源，因此需要OMI观测以通过改进检索算法或卫星分辨率来提高对近地表排放源的敏感性。

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