The influence of the vertical distribution of emissions on tropospheric chemistry 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
Received: 22 June 2009 – Published in Atmos. Chem. Phys. Discuss.: 28 July 2009 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.
Revised: 26 November 2009 – Accepted: 28 November 2009 – Published: 15 December 2009
Citation: Pozzer, A., Jöckel, P., and Van Aardenne, J.: The influence of the vertical distribution of emissions on tropospheric chemistry, Atmos. Chem. Phys., 9, 9417-9432, doi:10.5194/acp-9-9417-2009, 2009.