Author(s)

S. Andreani-Aksoyoglu & J. Keller

Abstract

Indicator species for 0, sensitivity relative to and VOC in Switzerland and their dependence on meteorology S. Andreani-Aksoyoglu, J. Keller Switzerland E-Mail: sebnem.andreani@psi.ch Abstract Ozone sensitivity can be determined by identifying individual species or species ratios that are consistently different under conditions of NOx-sensitive and VOC-sensitive ozone formation. These indicator species may provide a useful tool in the assessment of the relative effectiveness of VOC versus NO* controls. Following this approach, the model predictions for O, sensitivity relative to NO% and VOC levels in Switzerland are correlated to the afternoon concentration ratios of indicator species such as O^/NO,, O.^/NOy, HCHO/NOy and HoOo/HNO,. These correlations are based on a series' of simulations with varying rates of emissions and two different wind conditions. A base case in summer 1993 with light west wind was compared with a case having a stagnant meteorology. Results showed

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