An Explanation for the Worldwide Anomaly in the Concentration of Ozone Above 40 km

Abstract

It is pointed out that the anomalous seasonal variation in the worldwide ozone concentration above 40 km deduced from Umkehr measurements is opposite to the seasonal variation in atmospheric turbidity. The maximum and minimum seasonal variation in turbidity is used to estimate a haze correction to an Umkehr observation. From a comparison of ozone concentration deduced from corrected and uncorrected Umkehrs it is noted that 1) increased turbidity reduces the ozone concentration at 45 km, and 2) the maximum seasonal change in turbidity can nearly, if not entirely, account for the maximum seasonal change (about 2 ?mb) in ozone concentration at 45 km.