Articles | Volume 9, issue 24
Atmos. Chem. Phys., 9, 9417–9432, 2009
https://doi.org/10.5194/acp-9-9417-2009

Special issue: The Modular Earth Submodel System (MESSy) (ACP/GMD inter-journal...

Atmos. Chem. Phys., 9, 9417–9432, 2009
https://doi.org/10.5194/acp-9-9417-2009

  15 Dec 2009

15 Dec 2009

The influence of the vertical distribution of emissions on tropospheric chemistry

A. Pozzer2,1, P. Jöckel*,2, and J. Van Aardenne3 A. Pozzer et al.
  • 1The Cyprus Institute, Energy, Environment and Water Research Centre, Nicosia, Cyprus
  • 2Max-Planck Institute of Chemistry, Air Chemistry Department, Mainz, Germany
  • 3European Commission, DG Joint Research Centre, Ispra, Italy
  • *now at: Deutsches Zentrum fuer Luft- und Raumfahrt, Oberpfaffenhofen, Wessling, Germany

Abstract. The atmospheric chemistry general circulation model EMAC (ECHAM5/MESSy atmospheric chemistry) is used to investigate the effect of height dependent emissions on tropospheric chemistry. In a sensitivity simulation, anthropogenic and biomass burning emissions are released in the lowest model layer. The resulting tracer distributions are compared to those of a former simulation applying height dependent emissions. Although the differences between the two simulations in the free troposphere are small (less than 5%), large differences are present in polluted regions at the surface, in particular for NOx (more than 100%), CO (up to 30%) and non-methane hydrocarbons (up to 30%), whereas for OH the differences at the same locations are somewhat lower (15%). Global ozone formation is virtually unaffected by the choice of the vertical distribution of emissions. Nevertheless, local ozone changes can be up to 30%. Model results of both simulations are further compared to observations from field campaigns and to data from measurement stations.

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