ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-12-6129-2012 Stratosphere-troposphere ozone exchange from high resolution MLS ozone analyses Barré J. 1 Peuch V.-H. 2 Attié J.-L. 1 3 El Amraoui L. 1 Lahoz W. A. 1 4 Josse B. 1 Claeyman M. 1 3 Nédélec P. 3 CNRM-GAME, Météo-France and CNRS URA1357, Toulouse, France ECMWF, Shinfield Park, Reading, UK Laboratoire d'{A}érologie, Université de Toulouse, CNRS/INSU, Toulouse, France NILU, 2027 Kjeller, Norway 16 07 2012 12 14 6129 6144 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/12/6129/2012/acp-12-6129-2012.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/6129/2012/acp-12-6129-2012.pdf

We assimilate stratospheric ozone profiles from MLS (Microwave Limb Sounder) into the MOCAGE Chemistry Transport Model (CTM) to study Stratosphere-Troposphere Exchange (STE). This study uses two horizontal grid resolutions of 2° and 0.2°. The combined impacts of MLS ozone assimilation and high horizontal resolution are illustrated in two case studies where STE events occurred (23 June 2009 and 17 July 2009). At high resolution the filamentary structures of stratospheric air which characterise STE events are captured by the model. To test the impact of the assimilation and the resolution, we compare model outputs from different experiments (high resolution and low resolution; MLS assimilation run and free run) with independent data (MOZAIC aircraft ozone data; WOUDC ozone sonde network data). MLS ozone analyses show a better description of the Upper Troposphere Lower Stratosphere (UTLS) region and the stratospheric intrusions than the free model run. In particular, at high horizontal resolution the MLS ozone analyses present realistic filamentary ozone structures in the UTLS and laminae structures in the ozone profile. Despite a low aspect ratio between horizontal resolution and vertical resolution in the UTLS at high horizontal resolution, MLS ozone analyses improve the vertical structures of the ozone fields. Results from backward trajectories and ozone forecasts show that assimilation at high horizontal resolution of MLS ozone profiles between 10 hPa and 215 hPa has an impact on tropospheric ozone.

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