Nitrogen compounds and ozone in the stratosphere: comparison of MIPAS satellite data with the chemistry climate model ECHAM5/MESSy1 C. Brühl1, B. Steil1, G. Stiller2, B. Funke3, and P. Jöckel1 1Max-Planck-Institute for Chemistry, Mainz, Germany 2Institute for Meteorology and Climate Research, Forschungszentrum Karlsruhe, Germany 3Instituto de Astrof\'isica de Andalucía, Granada, Spain
Abstract. The chemistry climate model ECHAM5/MESSy1 (E5/M1) in a
setup extending from the surface to 80 km with
a vertical resolution of about 600 m near the tropopause with nudged tropospheric
meteorology allows a direct comparison with satellite data of chemical species
at the same time and location. Here we present results out of a transient 10~years
simulation for the period of the Antarctic vortex split in September 2002,
where data of MIPAS on the ENVISAT-satellite are
available. For the first time this satellite instrument opens the opportunity,
to evaluate all stratospheric nitrogen containing species simultaneously with a
good global coverage, including the source gas N2O and ozone which allows an estimate for
NOx-production in the stratosphere.
We show correlations between simulated and
observed species in the altitude region between 10 and 50 hpa for different
latitude belts, together with the Probability Density Functions (PDFs)
of model results and observations.
This is supplemented by global maps on pressure levels showing the comparison between the satellite
and the simulated data sampled at the same time and location.
We demonstrate that the model
in most cases captures the partitioning in the nitrogen family, the diurnal cycles and the
spatial distribution within experimental uncertainty. This includes even variations due to tropospheric clouds.
There appears to be, however, a problem
to reproduce the observed nighttime partitioning between N2O5 and NO2
in the middle stratosphere using the recommended set of reaction coefficients and photolysis data.
Citation: Brühl, C., Steil, B., Stiller, G., Funke, B., and Jöckel, P.: Nitrogen compounds and ozone in the stratosphere: comparison of MIPAS satellite data with the chemistry climate model ECHAM5/MESSy1, Atmos. Chem. Phys., 7, 5585-5598, doi:10.5194/acp-7-5585-2007, 2007.