Contribution from the Ox-, HOx-, NOx-, ClOx-, and BrOx-cycles to the stratospheric ozone depletion in the XXI century

Abstract

Based on a previously proposed algorithm for calculating the characteristics of the limiting chain propagation step in the cycles of stratospheric ozone destruction, the contributions from the O_x-, HO_x-, NO_x-, ClO_x-, and BrO_x-cycles to ozone depletion at the end of the XXI century at the latitude of 50° N in different seasons are calculated. The calculations are performed using the SOCRATES two-dimensional interactive model and the concentrations of the main greenhouse gases specified by the RCP 4.5 scenario of the Intergovernmental Panel on Climate Change (IPCC), according to which the stabilization of radiative forcing should occur by the end of the XXI century. The paper reports data on the absolute rates of ozone destruction in these cycles and their relative contributions to ozone destruction in 1995 and 2100 at altitudes of 15–55 km and a latitude of 50° N for March, June, September, and December.