MAX-DOAS仪器观测O4吸收对气溶胶参量的敏感性研究

研究了基于地基差分吸收光谱技术观测的O4吸收反演气溶胶光学参量的敏感性.利用大气辐射传输模型McArtim分析了不同波长、不同气溶胶光学参量(光学厚度、边界层高度、单次散射反照率、非对称因子)对O4吸收(大气质量因子)的影响.结果表明,大气质量因子对中心波长变化不敏感,气溶胶光学厚度和边界层高度对O4吸收具有重要影响,气溶胶光学厚度从0.1增加到1时,3°仰角测量的大气质量因子减少了28%,边界层高度从0.1 km增加到1 km,3°仰角测量的大气质量因子增加了9.2%.平纬圈观测模式下O4吸收对单次散射反照率和非对称因子具有较好的灵敏度,提供了一种基于地基MAX-DOAS观测O4吸收反演气溶胶光学参量的新方法.

Sensitivity Study of Aerosol Parameters from Observations of O4 Absorption by MAX-DOAS

Sensitivity of retrieving aerosol optical parameters from O4 absorption measured by ground-based differential optical absorption spectroscopy was studied.The influence of different wavelength and aerosol optical parameters(aerosol optical density,boundary layer height,single scattering albedo and asymmetric factor)on the absorption of O4 was analyzed by the atmospheric radiation transfer model(McArtim).The results show that the air mass factor is not sensitive to the wavelength change,and the aerosol optical density and boundary layer height have an important influence on O4 absorption(air mass factor).When the aerosol optical density increases from 0.1 to 1,the air mass factor measured at 3°decreases by 28%.And when the boundary layer height increases from 0.1 km to 1 km,the air mass factor measured at 3°increases by 9.2%.The O4 absorption has a good sensitivity to single scattering albedo and asymmetric factor under the flat-latitude observation mode,which provides a new method to retrieve aerosol optical parameters based on the observation of O4 absorption by ground-based MAX-DOAS.