PHOXA, the use of photochemical dispersion model for several episodes NW Europe
other
A long range photochemical dispersion model has been evaluated for a 5-day episode in 1980 and a 5-day episode in 1982. In general a reasonable agreement between measured and calculated Og-concentrations was found, however with underprediction of the highest measured data. Sensitivity analysis directed to NQX- and VOC-emission changes showed that for VOC emission reduction 03-concentration generally decreases. For NOx-emission reduction Og-decrease as well as increase occured. General conclusions concerning 03-concentration changes due to N0X~ and VOC-emission changes can only be drawn after further sensitivity analyses and a thorough generalisation of the results of the different episodes. In addition, for a complete study next to the photochemistry during episodes in the boundary layer also longer term average photochemical concentrations should be considered in the boundary layer and the free troposphere, and maybe even the relation with O3 in the stratosphere should be taken into account. Finally, an integral consideration of long range air pollution, photo chemistry as well as acidification is essential
Topics
TNO Identifier
250819
Publisher
TNO
Source title
Presented at 16th int. symposium Lindau/Switzerland
Place of publication
Apeldoorn
Pages
1-20
Files
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