O3-NOx-VOC sensitivity of NOx-VOC indicators in Paris : results from models and ESQUIF measurements

Sillman, S.; Menut, L.; Vautard, R.; Kley, D.

doi:10.1029/2002JD001561

Journal Article

PreJuSER-34362

O3-NOx-VOC sensitivity of NOx-VOC indicators in Paris : results from models and ESQUIF measurements

Sillman, S. ; Vautard, R. ; Menut, L. ; Kley, D.FZJ*

2003
Union Washington, DC

Journal of Geophysical Research 108, 17 (2003) [10.1029/2002JD001561]

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Please use a persistent id in citations: http://hdl.handle.net/2128/20589 doi:10.1029/2002JD001561

Abstract: [1] A three-dimensional photochemical model has been used to interpret aircraft measurements from the Atmospheric Pollution Over the Paris Area campaign near Paris, with special attention to measurements that are related to predicted O-3-NOx-volatile organic compound (VOC) sensitivity. The model (CHIMERE) includes a representation of ozone formation over Europe and a more detailed spatial representation of the region around Paris. A series of model scenarios were developed with varying wind speeds and emission rates. Comparisons are shown with measured O-3, total reactive nitrogen (NOy), summed VOCs, and isoprene. Results show that model NOx-VOC sensitivity predictions are correlated with the ratio O-3/NOy but not with O-3/peroxyacetyl nitrate. Measured O-3 and NOy on high-ozone days tends to agree with model values when models predict NOx-sensitive or transitional chemistry but not when models predict VOC-sensitive chemistry. Model values for O-3/NOy and the O-3-NOy slope are lower than measured values, suggesting the possibility of missing, unmeasured VOCs in the Paris plume. Standard performance tests for ozone models, such as normalized bias, show good agreement between models and measurements, even in cases when significant differences appear in the O-3-NOy correlation. Model predictions shift slightly toward NOx-sensitive chemistry when model wind speeds are increased. Isoprene represents 20% of total VOC reactivity - weighted carbon in the center of the Paris plume and 50% in the surrounding rural area during high-ozone events.

Keyword(s): J ; ozone (auto) ; nitrogen oxides (auto) ; VOCs (auto) ; isoprene (auto) ; photochemical models (auto)