全景扫描成像DOAS(HSI-DOAS)技术利用大视场成像光谱仪，水平扫描采集太阳散射光谱，可解析出NO2等痕量气体的高分辨率三维分布数据，对于研究污染物排放、传输和演变过程有重要意义，具有很大的应用前景和研究价值。但现阶段HSI-DOAS相关研究刚刚起步，尚停留在斜柱浓度反演阶段，三维分布解析的相关研究还没有开展，难以为大气环境科学研究提供有效数据，限制了该技术的推广应用。..为此，本项目开展HSI-DOAS监测NO2三维分布方法研究。研究中针对HSI-DOAS光谱响应不均一等特性，开展光谱定标、参考光谱选择、空间维合并等研究，以提高斜柱浓度反演精度；随后基于最优估算法，开展HSI-DOAS反演NO2垂直廓线研究；并利用O4斜柱浓度量化有效观测距离，以计算地表NO2混合比及分段混合比，最终获取NO2三维分布信息。本项目将推动HSI-DOAS技术在大气环境科学领域的应用和发展。

Hemispherical scanning imaging DOAS(HSI-DOAS) technology is developed based on imaging spectrometer with large field of view. It can derive atmospheric nitrogen dioxide high resolution three-dimensional distribution information through the horizontal scanning measurement of solar scattering light of every direction, and it will play important role on the research of pollutant emission, transport and chemical evolution process, so this technology has great application prospects and research value. Now the relative research of HSI-DOAS is just started, and stays on the period of retrieval of slant column density. The systematic study of trace gas three-dimensional distribution retrieval has not been carried out, so the valuable data cannot been provided for atmospheric environmental science, and the application and promotion of this technology is limited..To solve these problems, this research focuses on the retrieval algorithm of NO2 three-dimensional distribution from HSI-DOAS. Considering that HSI-DOAS has the characteristic of spectral response inhomogeneity and so on, research of instrument spectral calibration, selection of reference spectrum and image spatial binning will be carried out to improve trace gases slant column density precision; Then, the retrieval of NO2 vertical distribution from HSI-DOAS will be researched based on optimal estimation method; the effective observation path of HSI-DOAS will also be derived from O4 SCD for the calculation of surface NO2 mixing ratio and range resolved mixing ratio. Finally, three-dimensional distribution information are derived. This work will promate the improvement and application of HSI-DOAS technology in atmospheric environmental science.