Atmos. Chem. Phys. Discuss., 2, 1509-1543, 2002
www.atmos-chem-phys-discuss.net/2/1509/2002/
doi:10.5194/acpd-2-1509-2002
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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.
Ozone production and trace gas correlations during the June 2000 MINATROC intensive measurement campaign at Mt. Cimone
H. Fischer1, R. Kormann1, T. Klüpfel1, Ch. Gurk1, R. Königstedt1, U. Parchatka1, J. Mühle1, T. S. Rhee1, C. A. M. Brenninkmeijer1, P. Bonasoni2, and A. Stohl3
1Max Planck Institute for Chemistry, POB 3060, 55020 Mainz, Germany
2National Research Council, Institue of Atmospheric Sciences and Climate, via Gobetti 101, 40129 Bologna, Italy
3Technical University of Munich, Chair of Bioclimatology and Air Pollution Research, Am Hochanger 13, 85354 Freising-Weihenstephan, Germany

Abstract. An intensive measurement campaign was performed in June 2000 at the Mt. Cimone station (44°11' N -- 10°42' E, 2165 m asl, the highest mountain in the northern Italian Apennines) to study photochemical ozone production in the lower free troposphere. In general, average mixing ratios of important trace gases were not very high (121 ± 20 ppbv CO, 0.284 ± 0.220 ppbv NOx, 1.15 ± 0.8 ppbv NOy, 58 ± 9 ppbv O3), which indicates a small contribution by local pollution. This is supported by the analysis of volatile organic compounds (VOCs), that exhibit mean levels typical for background continental air (e.g. 905 ± 200\,pptv C2H6 268 ± 110\,pptv C3H8, 201 ±102 pptv C2H2, 111 ± 124 pptv isoprene, 65 ± 33 pptv benzene). Furthermore, significant diurnal variations for a number of trace gases (O3, CO, NOx, NOy, HCHO) indicate the presence of free tropospheric airmasses at nighttime as a consequence of local catabatic winds. Average mid-day peroxy radical concentrations at Mt. Cimone are of the order of 30 pptv. At mean NO concentrations of the order of 40 pptv this gives rise to significant in situ net O3 production of 0.1--0.3 ppbv/hr. The importance of O3 production is supported by correlations between O3, CO, NOz, and HCHO, and between HCHO, CO and NOy.

Citation: Fischer, H., Kormann, R., Klüpfel, T., Gurk, Ch., Königstedt, R., Parchatka, U., Mühle, J., Rhee, T. S., Brenninkmeijer, C. A. M., Bonasoni, P., and Stohl, A.: Ozone production and trace gas correlations during the June 2000 MINATROC intensive measurement campaign at Mt. Cimone, Atmos. Chem. Phys. Discuss., 2, 1509-1543, doi:10.5194/acpd-2-1509-2002, 2002.
 
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