【摘要】 针对我国大气污染特点,开展基于光学遥感技术的主动差分吸收光谱法(DOAS)反演近地面气溶胶消光系数的方法研究。首先介绍了主动DOAS的工作原理,分析了基于双光路DOAS技术解析气溶胶质粒消光信息的实质,探讨了利用单光路测量气溶胶的可行性,并利用干净条件下近距离测得光强,来校正系统,解决了差分吸收光谱技术中光源绝对光强难以确定的难题。在获取气溶胶消光系数同时,基于差分思想可以获取痕量气体的大气浓度。论文最后把该方法应用于外场数据的分析中,成功地反演出气溶胶的消光系数和痕量气体浓度。更多还原

【Abstract】 According to the characteristics of atmospheric pollutants in our country, the retrieval method of near ground aerosol extinction coefficient based on remote sensing active differential optical absorption spectroscopy (DOAS) was discussed in this paper. Firstly, the aerosol DOAS system and its principle were introduced, and then measurement method based on double optical path was analyzed. It is necessary and difficulty to determine the absolute source intensity. Here single optical path method was used to measure the aerosol extinction coefficient. The calibration of DOAS system was used in nearer path under clean environment. After that, the aerosol extinction coefficient was obtained. Therefore the difficulty in DOAS system is easily solved. Polluted gases and aerosol could be obtained simultaneously by DOAS. Finally, the method was applied in field campaigns, aerosol particles, and trace gases were successfully evaluated in DOAS system.更多还原