Atmos. Chem. Phys. Discuss., 8, 5437-5476, 2008
© Author(s) 2008. This work is distributed
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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.
The impact of free convection on late morning ozone decreases on an Alpine foreland mountain summit
J.-C. Mayer1, K. Staudt2, S. Gilge3, F. X. Meixner1,4, and T. Foken2
1Biogeochemistry Department, Max Planck Institute for Chemistry, Mainz, Germany
2Department of Micrometeorology, University of Bayreuth, Bayreuth, Germany
3German Meteorological Service, Observatory Hohenpeißenberg, Hohenpeißenberg, Germany
4Department of Physics, University of Zimbabwe, Harare, Zimbabwe

Abstract. Exceptional patterns in the diurnal course of ozone mixing ratio at a mountain top site (998 m a.s.l.) were observed during a field experiment (September 2005). They manifested themselves as strong and sudden decreases of ozone mixing ratio levels with a subsequent return to previous levels. Considering corresponding long-term time series (2000–2005) it was found, that such events occur mainly during summer, and affect the mountain top site in about 18% of the summer days. Combining (a) surface layer measurements at mountain summit and at the foot of the mountain, (b) in-situ (tethered balloon) and remote sensing (SODAR-RASS) measurements within the atmospheric boundary layer, the origin of these events of sudden ozone decrease could be attributed to free convection, triggered by a rather frequently occurring wind speed minimum around the location of the mountain.

Citation: Mayer, J.-C., Staudt, K., Gilge, S., Meixner, F. X., and Foken, T.: The impact of free convection on late morning ozone decreases on an Alpine foreland mountain summit, Atmos. Chem. Phys. Discuss., 8, 5437-5476, doi:10.5194/acpd-8-5437-2008, 2008.
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