Atmos. Chem. Phys. Discuss., 10, 15559-15593, 2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Transport analysis of ozone enhancement in Southern Ontario during BAQS-Met
H. He1, D. W. Tarasick1, W. K. Hocking2, T. K. Carey-Smith3, Y. Rochon1, J. Zhang1, P. A. Makar1, M. Osman2, J. Brook1, M. Moran1, D. Jones4, C. Mihele1, J. C. Wei5, G. Osterman6, P. S. Argall2, J. McConnell7, and M. S. Bourqui8
1Air Quality Research Division, Science and Technology Branch, Environment Canada, Downsview, ON, Canada
2Department of Physics and Astronomy, University of Western Ontario, London, ON, Canada
3National Institute of Water and Atmospheric Research Ltd., Private Bag 14901, Kilbirnie, Wellington, New Zealand
4Department of Physics, University of Toronto, Toronto, ON, Canada
5Perot Systems Government Services, NOAA/NESDIS/STAR, USA
6Jet Propulsion Laboratory, NASA, USA
7Department of Earth and Space Science and Engineering, York University, Toronto, ON, Canada
8Department of Chemistry and Atmospheric and Oceanic Sciences, McGill University, Montreal, QC, Canada

Abstract. Twice-daily ozonesondes were launched from Harrow, Ontario (east of Detroit) during the BAQS-Met (Border Air Quality and Meteorology Study) campaign in the summer of 2007. A co-located radar windprofiler measured tropopause height continuously. Simulation results from the dispersion model FLEXPART, using the output of the Environment Canada Global Environmental Multiscale (GEM) weather forecast model, indicate the occurrence of stratospheric ozone intrusion events during the BAQS-Met campaign. This interpretation is supported by the ozonesonde observations, one-minute average surface ozone data measured by the chemistry supersite at Harrow, and geostatistical interpolation results of satellite ozone data that were observed from TES (Tropospheric Emission Spectrometer) onboard NASA's Aura satellite and AIRS (Atmospheric Infrared Sounder) onboard NASA's Aqua satellite. Source-receptor analysis using the GEM-FLEXPART model shows the stratosphere over the Northwest Territories region close to the Beaufort Sea to be the main source of the enhanced ozone at Harrow on 1 July 2007.

Citation: He, H., Tarasick, D. W., Hocking, W. K., Carey-Smith, T. K., Rochon, Y., Zhang, J., Makar, P. A., Osman, M., Brook, J., Moran, M., Jones, D., Mihele, C., Wei, J. C., Osterman, G., Argall, P. S., McConnell, J., and Bourqui, M. S.: Transport analysis of ozone enhancement in Southern Ontario during BAQS-Met, Atmos. Chem. Phys. Discuss., 10, 15559-15593, doi:10.5194/acpd-10-15559-2010, 2010.
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