Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 6 8 2006 10.5194/acp-6-2337-2006 http://www.atmos-chem-phys.net/6/2337/2006/ http://www.atmos-chem-phys.net/6/2337/2006/acp-6-2337-2006.html http://www.atmos-chem-phys.net/6/2337/2006/acp-6-2337-2006.pdf 2337 2353 2006-06-22 Stratosphere-troposphere exchange in a summertime extratropical low: analysis J. Brioude J.-P. Cammas O. R. Cooper Laboratoire d'Aérologie, UMR5560, Observatoire Midi-Pyrénées, Toulouse, France Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado/NOAA Earth System Research Laboratory, Boulder, USA Ozone and carbon monoxide measurements sampled during two commercial flights in airstreams of a summertime midlatitude cyclone are analysed with a Lagrangian-based study (backward trajectories and a Reverse Domain Filling technique) to gain a comprehensive understanding of transport effects on trace gas distributions. The study demonstrates that summertime cyclones can be associated with deep stratosphere-troposphere transport. A tropopause fold is sampled twice in its life cycle, once in the lower troposphere (O₃≃100 ppbv; CO≃90 ppbv) in the dry airstream of the cyclone, and again in the upper troposphere (O₃≃200 ppbv; CO≃90 ppbv) on the northern side of the large scale potential vorticity feature associated with baroclinic development. In agreement with the maritime development of the cyclone, the chemical composition of the anticyclonic portion of the warm conveyor belt outflow (O₃≃40 ppbv; CO≃85 ppbv) corresponds to the lowest mixing ratios of both ozone and carbon monoxide in the upper tropospheric airborne observations. 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