近年来利用多轴差分光学吸收光谱仪MAX-DOAS，观测反演对流层气溶胶和痕量气体垂直廓线已成为大气成分遥感研究中最为活跃的领域，但如何准确评估廓线反演结果的可靠性和误差，仍是目前亟待解决的科学问题。河北固城生态与农业气象试验站是位于京津冀腹地、石家庄-北京输送通道上的农村站点。本项目将利用2008-2010年期间固城站获得的MAX-DOAS光谱观测数据，进行对流层气溶胶、NO2与SO2垂直廓线的反演研究；并利用这期间数次飞机观测获得的固城上空气溶胶、SO2和NO2垂直廓线数据，与MAX-DOAS廓线反演结果进行对比分析，评估MAX-DOAS廓线反演的准确度和误差。项目研究有益于改进MAX-DOAS廓线反演研究方法、优化模式参数设置以及量化反演误差，同时也有益于加深对京津冀地区主要大气污染物时空分布特征和变化规律的认识，为进一步揭示京津冀地区大气污染形成机理、制定有效控制措施提供科学依据。

Retrieval of tropospheric aerosol and trace gas vertical profiles by MAX-DOAS has been very active in the atmospheric composition remote sensing research field. However, how to evaluate the reliability and uncertainties in retrieved profiles still remains a scientific question to be solved. The Gucheng Agro-ecological meteorological Station is a rural site located in the core area of the Beijing, Tianjin and Hebei region (called Jing-Jin-Ji in Chinese) and in the midway of the Shijiazhuang-Beijing transport corridor. This proposal will carry out a study of vertical profile inversion of tropospheric aerosol extinction, SO2 and NO2 mixing ratios based on more than two years of MAX-DOAS measurements at the Gucheng station during 2008-2010. Several flights of aircraft measurements tropospheric aerosols, NO2 and SO2 made over Gucheng among that period will be used to perform comparison analysis and to evaluate the accurancy and errors in the MAX-DOAS retrieved results. The proposed project will be helpful for improving profile inversion method, optimizing model parameter settings, and quantifying inversion errors. It would also increase our understanding of the temporal and spatial distribution of air pollutants and its change role in the Jing-Jin-Ji region, and thus provide scientific bases for revealing formation mechanisms of air pollution and making effective control policies for this region.