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The ratio Φ=kHC+OH[HC]/kNOx+OH[NOx] is used as an indicator forthe sensitivity of ozone production (P(O3)) to HC and NOx in thefield campaign RISFEX 2003 (RIShiri Fall EXperiment 2003) at Rishiri Island(45.07° N, 141.12° E, and 35 m a.s.l.) in the sea of Japan during September 2003.Four different sensitivity regimes are obtained based on the indicator. Thesensitivity is found to show a distinctive pattern in each regime. In Regime I(Φ<1), P(O3) almost linearly increases with increasing HC andalmost linearly decreases with increasing NOx. In Regime II (1<Φ<9 ± 5), there is a less-than-linear increase in P(O3) with HC anda less-than-linear decrease with NOx. P(O3) less-than-linearlyincreases with both HC and NOx in Regime III (9 ± 5<Φ<45 ± 7),and near linearly increases with NOx and is nearly constant withincreasing HC in Regime IV (Φ>45 ± 7). During the campaign, 91 percentof P(O3) data appear in Regime III and IV, indicating that NOx is alimiting factor of ozone production. Hence, it may be an efficient strategyto control NOx emission for ozone abatement at the site. Comparisons between the observed P(O3) and the ones modelled have representedgeneral agreement. However, the model tends to underestimate P(O3) inRegime II, implying that an important source of peroxy radicals is possiblymissed. In Regime IV, the modelled P(O3) is systematically larger thanthe measured one under a low j(O1D) condition, which may be caused by theover-estimated yields of peroxy radicals from the reactions of monoterpeneswith ozone. A budget analysis indicates that sensitivity of P(O3) isdeclining with HC and enhancing with NO when the condition shifts fromRegime II to Regime IV, which is also observed through the analysis ofP(O3) sensitivity using Φ. Sensitivity studies for P(O3) areconducted to determine the effect of NOx and monoterpenes on ozoneproduction and the conclusions are very consistent with those derived fromthe indicator. This study demonstrates that the ratio Φ could be a usefulindex to ascertain the sensitivity of P(O3) to HC and NOx in theclean marine boundary layer

Ozone production during the field campaign RISFEX 2003 in the sea of Japan: analysis of sensitivity and behaviour based on an improved indicator