Temporal Evolution of the Bromine Alpha Factor and Equivalent Effective Stratospheric Chlorine in Future Climate Scenarios

摘要: Abstract. Future trajectories of the stratospheric trace gas background will alter rates bromine- and chlorine-mediated catalytic ozone destruction via changes in partitioning inorganic halogen reservoirs underlying temperature structure stratosphere. The current formulation bromine alpha factor, ozone-destroying power atoms relative to chlorine atoms, is invariant with climate state. Here, we refactor introducing normalization a benchmark state, reformulate Equivalent Effective Stratospheric Chlorine (EESC) reflect both chlorine- bromine-mediated loss catalysis time. We show that ozone-processing extrapolar stratosphere significantly perturbed by future assumptions. Furthermore, our EESC-based estimate ozone-recovery date closer agreement recovery dates predicted using more sophisticated 3-D chemistry-climate models than prior formulations EESC employ climate-invariant values factor.