Ozone absorption coefficients and haze corrections for total ozone measurements with Dobson spectrophotometer

Abstract

From laboratory measurements of absorption in an ozone cell with a Dobson spectrophotometer and their comparison with the results of observations made with atmospheric ozone, Dobson has concluded that the absorption coefficients of ozone (from Vigroux' work) for the Band C wave lengths are too high and have to be revised. Observations made at Ahmedabad confirm this, Accepting that the difference of ozone absorption coefficients for A and D is 1.388 and assuming that by using the AD difference method the haze correction is eliminated, we determine the total ozone amount. Combining this With measurements of apparent total ozone with A wave.lengths alone, the haze correction is calculated. With this haze correction and known , ozone amount, the absorption coefficients for C and B wave lengths can be calculated.. The same absorption coefficients are obtained under varying conditions of haze. They are nearly the same as those obtained by Dobsonfrom his laboratory measurements with an ozone cell.