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Atmos. Chem. Phys., 10, 2175–2194, 2010 www.atmos-chem-phys.net/10/2175/2010/ Atmospheric © Author(s) 2010. This work is distributed under Chemistry the Creative Commons Attribution 3.0 License. and Physics Midlatitude stratosphere – troposphere exchange as diagnosed by MLS O3 and MOPITT CO assimilated fields L. El Amraoui1, J.-L. Attie´1,2, N. Semane3, M. Claeyman1,2, V.-H. Peuch1, J. Warner4, P. Ricaud2, J.-P. Cammas2, A. Piacentini5, B. Josse1, D. Cariolle5, S. Massart5, and H. Bencherif6 1CNRM-GAME, Met´ eo-France´ and CNRS, URA 1357, Toulouse, France 2Laboratoire d’Aerologie,´ Universite´ de Toulouse, CNRS/INSU, Toulouse, France 3CNRM, Direction de la Met´ eorologie´ Nationale, Casablanca, Morocco 4University of Maryland, Baltimore County, USA 5CERFACS, Toulouse, France 6Laboratoire de l’Atmosphere` et des Cyclones, Universite´ de La Reunion,´ France Received: 5 June 2009 – Published in Atmos. Chem. Phys. Discuss.: 1 October 2009 Revised: 12 February 2010 – Accepted: 16 February 2010 – Published: 2 March 2010 Abstract. This paper presents a comprehensive charac- and the free model they are 6.3 ppbv, 16.6 ppbv and 0.71, re- terization of a very deep stratospheric intrusion which oc- spectively. The paper also presents a demonstration of the curred over the British Isles on 15 August 2007. The sig- capability of O3 and CO assimilated fields to better describe nature of this event is diagnosed using ozonesonde mea- a stratosphere-troposphere exchange (STE) event in compar- ◦ ◦ surements over Lerwick, UK (60.14 N, 1.19 W) and is ison with the free run modelled O3 and CO fields. Although also well characterized using meteorological analyses from the assimilation of MLS data improves the distribution of O3 the global operational weather prediction model of Met´ eo-´ above the tropopause compared to the free model run, it is France, ARPEGE.
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