Analysis of Model Responses to Emission-reduction Scenarios within the CityDelta Project

This paper investigates how air quality models applied at different scales (50 and 5 km horizontal resolution) predict pollution levels in responses to emission control strategies in various cities in Europe. The CityDelta models generally agree, on both scales, on the ozone changes expected from the current legislation in 2010 and also agree about relatively little scope for further improvements from emission controls beyond CLE. Regarding PM10, larger differences between large and fine scale models are observed. Fine scale models generally capture important sub-grid effects, which are not represented by regional scale models. The latter are shown in particular to overpredict ozone concentrations in the city area due to the underprediction of the titration effects and to underpredict PM mean concentrations. A series of emission scenarios to address the question of the efficiency of local emission controls designed independently from regional measures is analyzed. Distinct conclusions in terms of the city importance are drawn. The analysis of the City Delta results brings a new quantification of the differences between Large and Fine scale air quality modelling.

THUNIS Philippe;  ROUIL L.;  CUVELIER Cornelis;  STERN R.;  KERSCHBAUMER A.;  BESSAGNET B.;  SCHAAP M.;  BUILTJES P.;  TARRASON Leonor;  DOUROS J.;  MOUSSIOPOULOS Nicolas;  PIROVANO G.;  BEDOGNI M.; 

2008-02-29

PERGAMON-ELSEVIER SCIENCE LTD

JRC33333

1352-2310,   

www.elsevier.com/locate/atmosenv,    https://publications.jrc.ec.europa.eu/repository/handle/JRC33333,   

10.1016/j.atmosenv.2006.09.001,