HR: 0800h
AN: A21B-0734    [Abstracts]
TI: CASE STUDY OF STRATOSPHERE-TROPOSPHERE EXCHANGE ASSOCIATED WITH A SUMMER EXTRATOPICAL LOW: MOZAIC AIRCRAFT MEASUREMENTS ANALYSIS AND MODELLING.
AU: * BRIOUDE, J
EM: brij@aero.obs-mip.fr
AF: LABORATOIRE D'AEROLOGIE OBSERVATOIRE MIDI-PYRENEES, 14 AVENUE E. BELIN, TOULOUSE, 31400 France
AU: CAMMAS, J
EM: camjp@aero.obs-mip.fr
AF: LABORATOIRE D'AEROLOGIE OBSERVATOIRE MIDI-PYRENEES, 14 AVENUE E. BELIN, TOULOUSE, 31400 France
AB: There is lack of knowledge of summer season case studies of stratosphere Troposphere Exchange, especially for intense and irreversible cases. Here we present a summer case of deep tropopause fold associated with dynamics of extratropical lows. The case study has been revealed by analysis of ozone, water vapor and carbon monoxide measurements from two MOZAIC aircrafts.The first aircraft captures a tropopause fold in the low troposphere. The second one flies in the upper level divergent outflow of the low and captures air masses processed by the Warm Conveyor Belt (WCB) and the Dry Airstream (DA). We perform backtrajectories (LAGRANTO tool) using 3-hourly ECMWF analysis to retrieve the origin of ozone and CO features in the flight time series, and to re-construct the 3 dimensional fields of Potential Vorticity with Reverse Domain Filling technique. Contribution of mixing processes between the WCB and the DA (convection, clear air turbulence, ...) involved during the event are analysed with a mesoscale model.
UR: http://www.aero.obs-mip.fr/mozaic/
DE: 3362 Stratosphere/troposphere interactions
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting