【摘要】 星载大气痕量气体差分吸收光谱仪（Environmental trace gases monitoring instrument, EMI）于2018年5月9日成功发射升空,目前在轨运行状态良好,能够有效获取全球紫外-可见波段地球大气散射光信号（Digital number, DN）值（0级数据）。为对遥感数据定量化应用,EMI输出的DN值需要完成光谱定标、几何定位、辐亮度定标等处理,得到1级数据产品,1级数据用于反演获取全球大气NO₂、SO₂和O₃等2级产品,进而应用于定量监测全球空气质量变化以及污染气体的分布输运过程。更多还原

【Abstract】 Environmental trace gases monitoring instrument（EMI） was launched on May 9 th, 2018, which can effectively acquire global ultraviolet-visible signal of atmosphere scattering. EMI raw digital number（DN） is called level 0 data.For quantitative application of EMI sensing data, spectral calibration, geometric positioning and radiometric calibration are required. Then the level 1 data is obtained. The level 1 data is used as input for scientific atmospheric retrieval algorithms. Retrieval results are applied to quantitatively monitor the global air quality changes and the transmission of pollutant gases distribution, which could get spatial and temporal distribution and variation of key global atmospheric composition and pollutants（such as NO₂, SO₂, O₃, etc.）.更多还原