Availability Study of Estimating Total Ozone by Scattered Ultraviolet From the Clear Zenith Blue Sky

Within the limitation of SBTART model, the paper is concerned with the preliminary study of the feasibility of determining total atmospheric ozone by scattered ultraviolet radiation from the clear zenith blue sky. The calculation results indicate that the larger sΩ0 value is, the longer the wavelength used for deriving total ozone should be. In addition, Lower total ozone content value in the atmosphere would induce less accurate retrieval results than higher one. The accuracy of total ozone determination, based on measurements at a single wavelength, is not good even if the intensity is measured within aa accuracy of 1%, reflectivity within 0.05, and surface pressure within 50 hPa.Measurements on a pair of wavelengths are found to reduce the effects of reflectivity and pressure and the retrieval results are in better accuracy. Similarly the shorter wavelength between the pair of wavelengths should be longer with the larger value of SJ？o. The wavelengths λ1 = 0.308 μm, λ2 ~- 0.3125 μm, λ3 -- 0.3175 μm associate with λ4 = 0.3300 μm respectively and produce three pairs denoted by pl, p2, p3 orderly, pl is selected when sΩ0 ≤ 1.5, p2 is selected when 1.5 〈 sΩ0 ≤ 3.0, p3 is selected when sΩ0 〉 3.0. Based on the selection principle the accuracy of retrieval results is 4% at least if the intensity is measured with accuracy within 1%, reflectivity within 0.05~ and surface pressure within 50 hPa.