O 3-NO x-VOC sensitivity and NOx-VOC indicators in Paris Results from models and ESQUIF mea.pdf
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O 3-NO x-VOC sensitivity and NOx-VOC indicators in Paris Results from models and ESQUIF mea
O3-NOx-VOC sensitivity and NOx-VOC indicators in Paris:
Results from models and Atmospheric Pollution Over
the Paris Area (ESQUIF) measurements
Sanford Sillman,1 Robert Vautard,2 Laurent Menut,3 and Dieter Kley4
Received 3 December 2001; revised 25 August 2002; accepted 21 September 2002; published 18 June 2003.
[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 O3-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 O3, total reactive nitrogen
(NOy), summed VOCs, and isoprene. Results show that model NOx-VOC sensitivity
predictions are correlated with the ratio O3/NOy but not with O3/peroxyacetyl nitrate.
Measured O3 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 O3/NOy and the O3-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 O3-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. INDEX TERMS: 0315 Atmospheric
Composition and Structure: Biosphere/atmosphere interactions; 0345 Atmospheric Composition and Structure
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