后向散射辐射探测大气臭氧总量反演方法的改进

An Improvement on Retrieval Method of Total Ozone's Determination Using Backscattered Ultraviolet Earth Radiances' Measurements

以SBDART模式作为辐射传输计算模式,在各种大气气溶胶存在的情况下利用现有的大气后向散射反演大气臭氧总量的Version7方法,模拟计算得到各种气溶胶存在时的大气臭氧总量,并分析了反演结果误差产生的原因．进一步提出根据斜气柱臭氧总量sΩ0,选择不同连续波长区间测量得到的后向散射强度来对臭氧总量的初估值Ω0进行修正的方法．将得到的结果与Version7的进行比较,证明了新方法的有效性．

Values of the total ozone content of an atmospheric column are estimated from the simulated measurements of the intensity of radiation backscattered by a horizontally homogeneous earth-atmosphere system by means of SBDART radiative transfer computation mode with atmo- sphere containing varions kinds of aerosols. The retrieval method used is the Version7 algorithm. When all kinds of aerosols are present in the atmosphere the retrieval error is analyzed and the main reason which brings the error is the assumption of the residues being linear at the properly chosen triplet of wavelengths. In the paper a method is introduced to correct the initial ozone estimate Ω0 using the intensity radiation backscattered measured at different continuous ultraviolet spectral region which is selected on the basis of the ozone slant column density sΩ0. At last the results obtained by the new method and Version7 algorithm are compared. The comparing result proves the new method＇s validity.