CityDelta : a model intercomparison study to explore the impact of emission reductions in European cities in 2010

C. Cuvelier 1 P. Thunis 1 Robert Vautard 2, 3 Markus Amann 4 Bertrand Bessagnet 5 M. Bedogni 6 R. Berkowicz 7 J. Brandt 7 F. Brocheton 8 P. Builtjes 9 C. Carnavale 10 Alexis Coppalle 11 B. Denby 12 J. Douros 13 A. Graff 14 O. Hellmuth 15 Cécile Honore 5 Alma Hodzic 2 J. Jonson 16 A. Kerschbaumer 17 Frank de Leeuw 18 E. Minguzzi 19 N. Moussiopoulos 13 C. Pertot 20 Vincent-Henri Peuch 8 Guido Pirovano 20 Laurence Rouil 5 F. Sauter 21 M. Schaap 9 R. Stern 17 L. Tarrason 16 E. Vignati 1 M. Volta 10 L. White 22 Philippe Wind 16 A. Zuber 23
Abstract : This paper gives an overview of the set up, methodology and the obtained results of the CityDelta (phase 1 and 2) project. In the context of the Clean Air For Europe programme of the European Commission, the CityDelta project was designed to evaluate the impact of emission-reduction strategies on air quality at the European continental scale and in European cities. Ozone and particulate matter (PM) are the main components that have been studied. To achieve this goal, a model intercomparison study was organized with the participation of more than 20 modelling groups with a large number of modelling configurations. Two following main topics can be identified in the project. First, in order to evaluate their strengths and weaknesses, the participating models were evaluated against observations in a control year (1999). An accompanying paper will discuss in detail this evaluation aspect for four European cities. The second topic is the actual evaluation of the impact of emission reductions on levels of ozone and PM, with particular attention to the differences between large-scale and fine-scale models. An accompanying paper will discuss this point in detail. In this overview paper the main input to the intercomparison is described as well as the use of the ensemble approach. Finally, attention is given to the policy relevant issue on how to implement the urban air quality signal into large-scale air quality models through the use of functional relationships.
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C. Cuvelier, P. Thunis, Robert Vautard, Markus Amann, Bertrand Bessagnet, et al.. CityDelta : a model intercomparison study to explore the impact of emission reductions in European cities in 2010. Atmospheric environment, Elsevier, 2007, 41 (1), pp.189-207. ⟨10.1016/j.atmosenv.2006.07.036⟩. ⟨ineris-00963054⟩

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