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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.
Bd. 8
(2008)
Heft 19
.
- S. 5941-5956.
ISSN 1680-7324
DOI: https://doi.org/10.5194/acp-8-5941-2008
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 with a subsequent return to previous levels. The evaluation of corresponding long-term time series (2000–2005) revealed that such events occur mainly during summer, and affect the mountain top site on 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. The free convection was triggered by a rather frequently occurring wind speed minimum around the location of the mountain.