Hohenpeissenberg Photochemical Experiment (HOPE 2000): Measurements and photostationary state calculations of OH and peroxy radicals

G. M. Handisides, C. Plass-Dülmer, S. Gilge, H. Bingemer, H. Berresheim
2002 Atmospheric Chemistry and Physics Discussions  
Measurements of OH, the sum of peroxy radicals (RO x ), non-methane hydrocarbons (NMHCs) and various other trace gases were made at the Meteorological Observatory Hohenpeissenberg in June 2000. The data from an intensive measurement period characterised by high solar insolation (18-21 June) are analysed. The maxi-5 mum midday OH concentration ranged between 4.5×10 6 molecules cm −3 and 7.4×10 6 molecules cm −3 . The maximum total RO x mixing ratio increased from about 55 pptv on 18 June to
more » ... on 18 June to nearly 70 pptv on 20 and 21 June. A total of 64 NMHCs, including isoprene and monoterpenes, were measured every 1 to 6 hours. The oxidation rate of the NMHCs by OH was calculated and reached a total of over 14×10 6 molecules cm −3 10 −1 20 on two days. The most important sink for OH, and the largest source of RO x , was the oxidation of NMHCs, in particular, of isoprene and the monoterpenes.
doi:10.5194/acpd-2-2507-2002 fatcat:lmunnkgrdfaqforzwlr3pu3lbu