Ozone observations with light from clear and cloudy zenith skies

Abstract

To make effective use of ozone measure-ments in Meteorology, daily observations of total ozone at a number of suitably dis-tributed stations is necessary. Dobson has shown that on days when the sky is clouded, measurements can be made with the light from the zenith sky. This method is followed at many stations in middle and high latitudes but has not gen-erally been used in tropical latitudes. To try out whether the same method can be used with cloudy skies in tropical latitudes, zenith sky measurements were made during the period June 1957 to June 1958 at Mt. Abu (24°N) on days which were cloudy but on whioh direct sun observation could also be taken within a few hours of .the zenith sky observation.