Reformulating the bromine alpha factor and equivalent effective stratospheric chlorine (EESC): evolution of ozone destruction rates of bromine and chlorine in future climate scenarios
| Autor: | Ross J. Salawitch, Debra K. Weisenstein, J. Eric Klobas, David M. Wilmouth |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Atmospheric Science
Ozone Bromine 010504 meteorology & atmospheric sciences Equivalent effective stratospheric chlorine chemistry.chemical_element 010502 geochemistry & geophysics Atmospheric sciences 7. Clean energy 01 natural sciences lcsh:QC1-999 Trace gas lcsh:Chemistry chemistry.chemical_compound lcsh:QD1-999 chemistry 13. Climate action Halogen Chlorine Environmental science Climate state Stratosphere lcsh:Physics 0105 earth and related environmental sciences |
| Zdroj: | Atmospheric Chemistry and Physics, Vol 20, Pp 9459-9471 (2020) |
| ISSN: | 1680-7324 |
| Popis: | Future trajectories of the stratospheric trace gas background will alter the rates of bromine- and chlorine-mediated catalytic ozone destruction via changes in the partitioning of inorganic halogen reservoirs and the underlying temperature structure of the stratosphere. The current formulation of the bromine alpha factor, the ozone-destroying power of stratospheric bromine atoms relative to stratospheric chlorine atoms, is invariant with the climate state. Here, we refactor the bromine alpha factor, introducing normalization to a benchmark chemistry–climate state, and formulate Equivalent Effective Stratospheric Benchmark-normalized Chlorine (EESBnC) to reflect changes in the rates of both bromine- and chlorine-mediated ozone loss catalysis with time. We show that the ozone-processing power of the extrapolar stratosphere is significantly perturbed by future climate assumptions. Furthermore, we show that our EESBnC-based estimate of the extrapolar ozone recovery date is in closer agreement with extrapolar ozone recovery dates predicted using more sophisticated 3-D chemistry–climate models than predictions made using equivalent effective stratospheric chlorine (EESC). |
| Databáze: | OpenAIRE |
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