Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 7 3 2007 10.5194/acpd-7-8017-2007 http://www.atmos-chem-phys-discuss.net/7/8017/2007/ http://www.atmos-chem-phys-discuss.net/7/8017/2007/acpd-7-8017-2007.html http://www.atmos-chem-phys-discuss.net/7/8017/2007/acpd-7-8017-2007.pdf 8017 8033 2007-06-08 Mixing between a stratospheric intrusion and a biomass burning plume J. Brioude jerome.brioude@noaa.gov O. R. Cooper M. Trainer T. B. Ryerson J. S. Holloway T. Baynard J. Peischl C. Warneke J. A. Neuman J. De Gouw A. Stohl S. Eckhardt G. J. Frost S. A. McKeen E.-Y. Hsie F. C. Fehsenfeld P. Nédélec Chemical Sciences Division, Earth Science Reasearch Laboratory, NOAA, Boulder, Colorado, USA Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA Norwegian Institute for Air Research, Kjeller, Norway Laboratoire d'Aérologie, UMR 5560, Observatoire Midi-Pyrénées, Toulouse, France Ozone, carbon monoxide, aerosol extinction coefficient, acetonitrile, nitric acid and relative humidity measured from the NOAA P3 aircraft during the TexAQS/GoMACCS 2006 experiment, indicate mixing between a biomass burning plume and a stratospheric intrusion in the free troposphere above eastern Texas. Lagrangian-based transport analysis and satellite imagery are used to investigate the transport mechanisms that bring together the tropopause fold and the biomass burning plume originating in southern California, which may affect the chemical budget of tropospheric trace gases. Andreae, M. 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