Wang, W.; Chai, S.; Wang, H.; Fan, W.; Yu, K.; Liang, S., and Ma, J., 2015. The influence of sulfur dioxide on dobson spectrophotometer total ozone measurement: Analysis on the basis of theoretical factor.

Using the WOUDC observational data and absorption cross sections of O₃ and SO₂, SO₂, the paper has calculated absorption coefficients and the theoretical factor C to analyze the influence of sulfur dioxide (SO₂) on Dobson spectrophotometer total ozone measurement. The calculation results show that: SO₂ absorption coefficient Δγ_AD is 1.843, and influence factor C related to Δγ_AD has obvious seasonal variation that reaches a maximum in winter and a minimum in summer; moreover, the presence of SO₂ leads to higher amount of Dobson ozone than the actual values. After the correction by using the factor C, the relative difference between Dobson and Brewer data sets shows a decrease by 1∼3%. On the other hand, the effect of SO₂ on Dobson total ozone is reduced due to the decrease of total SO₂, but it should still be taken into account during a high-pollution period.