Semi-empirical models for chlorine activation and ozone depl

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TitleSemi-empirical models for chlorine activation and ozone depletion in the Antarctic stratosphere: Proof of conceptAbstractTwo semi-empirical models were developed for the Antarctic stratosphere to relate the shift of species within total chlorine (Cly = HCl + ClONO2 + HOCl + 2 × Cl2 + 2×Cl2O2 + ClO + C) into the active forms (here: ClOx = 2×Cl2O2 + Cl), and to relate the rate of ozone destruction to ClOx. These two models provide a fast and computationally inexpensive way to describe the inter- and intra-annual evolution of ClOx and ozone mass deficit (OMD) in the Antarctic spring. The models are based on the underlying physics/chemistry of the system and capture the key chemical and physical processes in the Antarctic stratosphere that determine the interaction between climate change and Antarctic ozone depletion. They were developed considering bulk effects of chemical mechanisms for the duration of the Antarctic vortex period and quantities averaged over the vortex area. The model equations were regressed against observations of daytime ClO and OMD providing a set of empirical fit coefficients. Both semi-empirical models are able to explain much of the intra- and inter-annual variability observed in daily ClOx and OMD time series. This proof-of-concept paper outlines the semi-empirical approach to describing the evolution of Antarctic chlorine activation and ozone depletion. Copyright 2013 Author(s).AcknowledgementsThis work was supported by the DFG (Deutsche Forschungsgemeinschaft) and by the Marsden Fund Council from Government funding, administered by the Royal Society of New Zealand. NCEP/NCAR reanalyses were provided by the NOAA-CIRES Climate Diagnostics Center, Boulder, Colorado, USA, from their Web site at http://www.cdc.noaa.gov/. We would like to thank Michelle Santee for providing the MLS data and for detailed comments and suggestions on the manuscript.

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1st AuthorHuck, P.AuthorHuck, P.Bodeker, G.Kremser, S.McDonald, A.Rex, M.Struthers, H.Year2013JournalAtmospheric Chemistry and PhysicsVolume13Number6Pages3237-3243DOI10.5194/acp-13-3237-2013URLhttps://www.scopus.com/inward/recor.....7576b586a82355492194681d9Keywordsatmospheric chemistryatmospheric modelingchemical compositionchlorineozone depletionstratosphere, Antarctica, rank3

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TypeArticleCitationHuck, P., Bodeker, G., Kremser, S., McDonald, A., Rex, M. and Struthers, H. (2013). Semi-empirical models for chlorine activation and ozone depletion in the Antarctic stratosphere: Proof of concept. Atmospheric Chemistry and Physics, 13(6): 3237-3243 IdentifierHuck2013Relevancerank3