Uncertainties in modelling heterogeneous chemistry and Arctic ozone depletion in the winter 2009/2010

by I. Wohltmann, T. Wegner, R. M??ller, R. Lehmann, M. Rex, G. L. Manney, M. L. Santee, P. Bernath, O. Suminska-Ebersoldt, F. Stroh, M. Von Hobe, C. M. Volk, E. H??sen, F. Ravegnani, A. Ulanovsky, V. Yushkov show all authors
Atmospheric Chemistry and Physics ()
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Abstract

Stratospheric chemistry and denitrification are simulated for the Arctic winter 2009/2010 with the Lagrangian Chemistry and Transport Model ATLAS. A number of sensitivity runs is used to explore the impact of uncertainties in chlorine activation and denitrification on the model results. In particular, the efficiency of chlorine activation on 5 different types of liquid aerosol versus activation on nitric acid trihydrate clouds is ex-amined. Additionally, the impact of changes in reaction rate coefficients, in the particle number density of polar stratospheric clouds, in supersaturation, temperature or the ex-tent of denitrification is investigated. Results are compared to satellite measurements of MLS and ACE-FTS and to in-situ measurements onboard the Geophysica aircraft 10 during the RECONCILE measurement campaign. It is shown that even large changes in the underlying assumptions have only a small impact on the modeled ozone loss, even though they can cause considerable differences in chemical evolution and den-itrification. In addition, it is shown that chlorine activation on liquid aerosols alone is able to explain the observed magnitude and morphology of the mixing ratios of active 15 chlorine, reservoir gases and ozone.

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