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Mayer, Jens-Christopher ; Staudt, Katharina ; Gilge, S. ; Meixner, Franz X. ; Foken, Thomas:
The impact of free convection on late morning ozone decreases on an Alpine foreland mountain summit.
In: Atmospheric Chemistry and Physics Discussions.
Bd. 8
(2008)
Heft 2
.
- S. 5437-5476.
ISSN 1680-7375
DOI: https://doi.org/10.5194/acpd-8-5437-2008
Abstract
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.