Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 6 2008 10.5194/acpd-8-20925-2008 http://www.atmos-chem-phys-discuss.net/8/20925/2008/ http://www.atmos-chem-phys-discuss.net/8/20925/2008/acpd-8-20925-2008.html http://www.atmos-chem-phys-discuss.net/8/20925/2008/acpd-8-20925-2008.pdf 20925 20964 2008-12-16 Injection in the lower stratosphere of biomass fire emissions followed by long-range transport: a MOZAIC case study J.-P. Cammas jean-pierre.cammas@aero.obs-mip.fr J. Brioude J.-P. Chaboureau J. Duron C. Mari P. Mascart P. Nédélec H. Smit H.-W. Pätz A. Volz-Thomas A. Stohl M. Fromm Université de Toulouse, UPS, LA (Laboratoire d'Aérologie), 14 avenue Edouard Belin, 31400 Toulouse, France and CNRS, LA (Laboratoire d'Aérologie), 31400 Toulouse, France Chemical Sciences Division, Earth Science Research Laboaratory, NOAA, Boulder, Colorado, USA Forschungszentrum, Jülich, Germany Norwegian Institute for Air Research (NILU), Kjeller, Norway Naval Research Laboratory, Washington, DC, USA This paper analyses a stratospheric injection by deep convection of biomass fire emissions over North America (Alaska, Yukon and Northwest Territories) on 24 June 2004 and its long-range transport over the eastern coast of the United States and the eastern Atlantic. The case study is done using MOZAIC observations of ozone, carbon monoxide, nitrogen oxides (NO_x+PAN) and water vapour during the crossing of the southernmost tip of an upper level trough over the Eastern Atlantic on 30 June 03:00 UTC and 10:00 UTC and in a vertical profile over Washington DC on 30 June 17:00 UTC, and by lidar observations of aerosol backscattering at Madison (University of Wisconsin) on 28 June. Attribution of the plumes to the boreal fires is achieved by backward simulations with a Lagrangian particle dispersion model (FLEXPART). A simulation with the Meso-NH model for the source region shows that a boundary layer tracer, mimicking the boreal forest fire smoke, is lofted into the lowermost stratosphere (2–5 pvu layer) during the diurnal convective cycle. The isentropic levels (above 335 K) correspond to those of the downstream MOZAIC observations. 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