Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 13 2008 10.5194/acp-8-3411-2008 http://www.atmos-chem-phys.net/8/3411/2008/ http://www.atmos-chem-phys.net/8/3411/2008/acp-8-3411-2008.html http://www.atmos-chem-phys.net/8/3411/2008/acp-8-3411-2008.pdf 3411 3426 2008-07-01 Morphology of the tropopause layer and lower stratosphere above a tropical cyclone: a case study on cyclone Davina (1999) F. Cairo f.cairo@isac.cnr.it C. Buontempo A. R. MacKenzie C. Schiller C. M. Volk A. Adriani V. Mitev R. Matthey G. Di Donfrancesco A. Oulanovsky F. Ravegnani V. Yushkov M. Snels C. Cagnazzo L. Stefanutti Istituto di Scienze dell'Atmosfera e del Clima, CNR, Roma, Italy Environmental Science Department, Lancaster University, Lancaster, UK Institute for Stratospheric Research, Forschungszentrum Jülich GmbH, Jülich, Germany Institute for Atmosphere and Environment, J. W. Goethe University, Frankfurt, Germany Observatoire Cantonal Neuchatel, Neuchatel, Switzerland Ente per le Nuove Tecnologie, l'Energia e l'Ambiente, Frascati, Rome, Italy Central Aerological Observatory, Dolgoprudny, Russia Istituto Nazionale di Geofisica e Vulcanologia, Boulogne, Italy Airborne Platform for earth Observation, Comitato di Gestione, Florence, Italy now at: United Kingdom Meteorological Office, Exeter, UK now at: Istituto di Fisica dello Spazio Interplanetario, INAF, Rome, Italy now at: Geophysica Gruppo Europeo di Interesse Economico, Florence, Italy During the APE-THESEO mission in the Indian Ocean the Myasishchev Design Bureau stratospheric research aircraft M55 Geophysica performed a flight over and within the inner core region of tropical cyclone Davina. Measurements of total water, water vapour, temperature, aerosol backscattering, ozone and tracers were made and are discussed here in comparison with the averages of those quantities acquired during the campaign time frame. <br><br> Temperature anomalies in the tropical tropopause layer (TTL), warmer than average in the lower part and colder than average in the upper TTL were observed. Ozone was strongly reduced compared to its average value, and thick cirrus decks were present up to the cold point, sometimes topped by a layer of very dry air. Evidence for meridional transport of trace gases in the stratosphere above the cyclone was observed and perturbed water distribution in the TTL was documented. The paper discuss possible processes of dehydration induced by the cirrus forming above the cyclone, and change in the chemical tracer and water distribution in the lower stratosphere 400–430 K due to meridional transport from the mid-latitudes and link with Davina. 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