|Mayer, JC; Staudt, K; Gilge, S; Meixner, FX; Foken, T: The impact of free convection on late morning ozone decreases on an Alpine foreland mountain summit, Atmospheric Chemistry and Physics, Discussion, 8, 5437–5476 (2008) [Link]|
|Key words: ozone, Alpine pumping, free convection|
Exceptional patterns in the diurnal course of ozone mixing ratio at a mountain top site (998m 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 revious 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 mospheric be attributed to free convection, triggered by a rather frequently occurring wind speed minimum around the location of the mountain.
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