HR: 0800h
AN: A51D-0091    [Abstracts]
TI: Investigating Stratosphere-Troposphere Exchange Using VHF Radar and High Density Ozone-Sonde Launches
AU: * Carey-Smith, T
EM: tcareysm@uwo.ca
AF: Department of Physics and Astronomy, University of Western Ontario, Richmond St, London, ON N6A3K7 Canada
AU: Hocking, W
EM: whocking@uwo.ca
AF: Department of Physics and Astronomy, University of Western Ontario, Richmond St, London, ON N6A3K7 Canada
AU: Tarasick, D
EM: david.tarasick@ec.gc.ca
AF: Meteorological Service of Canada, 4905 Dufferin St, Downsview, ON M3H5T4 Canada
AU: Strong, K
EM: strong@atmosp.physics.utoronto.ca
AF: Department of Physics, University of Toronto, 60 George St, Toronto, ON M5S1A7 Canada
AU: Rochon, Y
EM: yves.rochon@ec.gc.ca
AF: Meteorological Service of Canada, 4905 Dufferin St, Downsview, ON M3H5T4 Canada
AU: Zawadzki, I
EM: isztar.zawadzki@mcgill.ca
AF: Atmospheric and Oceanic Sciences, McGill University, 805 Sherbrooke Street West, Montreal, QC H3A2K6 Canada
AU: Argall, S
EM: sargall@uwo.ca
AF: Department of Physics and Astronomy, University of Western Ontario, Richmond St, London, ON N6A3K7 Canada
AB: This paper describes a tropopause fold event during which stratospheric air is transported into the boundary layer. Data available during the case study include surface ozone measurements, twice daily ozone-sonde profiles and wind and turbulence measurements from a radar wind-profiler. The combined results provide valuable insight into the mechanisms of stratosphere-troposphere exchange. Measurements from the radar indicate the precise time and also the structure of the tropopause fold, which reaches as low as 6~km. Turbulent energy dissipation rates also calculated from the radar show a region of high turbulence near the fold. The ozone-sonde profiles track the evolution of the intrusion, including its descent into the boundary layer, and indicate that the intrusion persists for 5 to 6 days producing high ozone concentrations in the lower 4~km of the troposphere. The surface measurements provide independent evidence of ozone-enriched air reaching the ground.
DE: 0368 Troposphere: constituent transport and chemistry
DE: 3362 Stratosphere/troposphere interactions
DE: 6969 Remote sensing
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005