Atmos. Chem. Phys. Discuss., 7, 6329-6356, 2007
www.atmos-chem-phys-discuss.net/7/6329/2007/
doi:10.5194/acpd-7-6329-2007
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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.
Tropospheric OH and Cl levels deduced from non-methane hydrocarbon measurements in a marine site
C. Arsene1,2, A. Bougiatioti1, M. Kanakidou1, B. Bonsang3, and N. Mihalopoulos1
1Environmental Chemical Processes Laboratory, Department of Chemistry, University of Crete, Greece
2Inorganic and Analytical Chemistry Department, Faculty of Chemistry, Al.I Cuza University of Iasi, Romania
3Laboratoire des Sciences du Climat et de l'Environnement, CNRS/CEA, France

Abstract. In situ continuous hourly measurements of C2-C8 non-methane hydrocarbons (NMHCS) have been performed from March to October 2006 at two coastal locations on the island of Crete, in the Eastern Mediterranean. Well defined diurnal variations were observed for several short lived NMHCS (including ethene, propene, n-butane, n-pentane, n-hexane, 2-methyl-pentane). The daytime concentration of hydroxyl (OH) radicals estimated from these experimental data varied from 1.3×106 to ~4.0×106 radical cm−3, in good agreement with box-model simulations. In addition the relative variability of various hydrocarbon pairs (at least 7) was used to derive the tropospheric levels of Cl atoms. The Cl atom concentration has been estimated to range between 0.6×104 and 4.7×104 atom cm−3, in good agreement with gaseous hydrochloric acid (HCl) observations in the area. Such levels of Cl atoms can be of considerable importance for the oxidation capacity of the troposphere on a regional scale.

Citation: Arsene, C., Bougiatioti, A., Kanakidou, M., Bonsang, B., and Mihalopoulos, N.: Tropospheric OH and Cl levels deduced from non-methane hydrocarbon measurements in a marine site, Atmos. Chem. Phys. Discuss., 7, 6329-6356, doi:10.5194/acpd-7-6329-2007, 2007.
 
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