中文摘要：

利用车载差分光学吸收光谱技术（DOAS）于2013年6月至7月对华北平原进行走航观测,研究了不同风场下SO_2和NO_2的柱浓度空间分布特征及其对北京地区的影响。研究发现,在石家庄、保定和济南附近同时观测到SO_2和NO_2高值,表明三地附近存在工业排放源,其中6月11日石家庄附近观测到SO_2和NO_2高值区域均值分别为1.29×10~（17）molecule·cm^-2和3.59×10~（16）molecule·cm^-2,为低值区域均值的3.8倍和3.6倍。在西南稳定风场下,石家庄—保定—北京方向为一条污染物输送通道,Hysplit风场轨迹模型结果也验证了该输送通道的存在。车载DOAS观测的NO_2柱浓度和臭氧检测仪（OMI）检测结果的对比显示,两者具有较好的一致性;同时卫星观测也验证了偏南风场下污染物输送通道的存在。实验结果表明车载DOAS技术在污染物排放源监测、空气污染物地区分布快速获取以及卫星数据校验方面都具有重要作用。

英文摘要：

Mobile differential optical absorption spectroscopy（DOAS） is used to study regional distribution of SO_2 and NO_2column density in the North China Plain and its impact on the Beijing region under different wind fields during June and July in 2013. High SO_2 and NO_2concentration values around Shijiazhuang, Baoding and Jinan areas are observed simultaneously, indicating that there are industrial emission sources in these areas.Average values of SO_2 and NO_2around the Shijiazhuang area on June 11 thare 1.29×10~（17）molecule·cm~（-2）and 3.59×10~（16）molecule · cm~（-2）, respectively, which are 3.8 times and 3.6 times of the average in low concentration area respectively. Shijiazhuang- Baoding- Beijing direction can be a transportation pathway in steady south- west wind field, and the conclusion is verified by the Hysplit model. NO_2 column density obtained by mobile DOAS is compared with that by ozone monitoring instrument（OMI）, and the good agreement is found. The satellite observation also proves existence of the transportation pathway in south wind field. The experimental results show that mobile DOAS plays an important role in detecting emission sources, rapidly obtaining regional distribution of air pollutants and validating satellite data.