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www.geosci-model-dev-discuss.net/4/1129/2011/
doi:10.5194/gmdd-4-1129-2011
© Author(s) 2011. This work is distributed
under the Creative Commons Attribution 3.0 License.
A new version of the CNRM Chemistry-Climate Model, CNRM-CCM: description and improvements from the CCMVal-2 simulations
1GAME/CNRM, Météo-France, CNRS – Centre National de Recherches Météorologiques, Toulouse, France
2Laboratoire d'Aérologie, Université de Toulouse, CNRS, Toulouse, France
3Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USA
*now at: Dept. of Geosciences, University of Oslo, Norway
Abstract. This paper presents a new version of the Météo-France CNRM Chemistry-Climate Model, so-called CNRM-CCM. It includes some fundamental changes from the previous version (CNRM-ACM) which was extensively evaluated in the context of the CCMVal-2 validation activity. The most notable changes concern the radiative code of the GCM, and the inclusion of the detailed stratospheric chemistry of our Chemistry-Transport model MOCAGE on-line within the GCM. A 47-yr transient simulation (1960–2006) is the basis of our analysis. CNRM-CCM generates satisfactory dynamical and chemical fields in the stratosphere. Several shortcomings of CNRM-ACM simulations for CCMVal-2 that resulted from an erroneous representation of the impact of volcanic aerosols as well as from transport deficiencies have been eliminated.
Remaining problems concern the upper stratosphere (5 to 1 hPa) where temperatures are too high, and where there are biases in the NO2, N2O5 and O3 mixing ratios. In contrast, temperatures at the tropical tropopause are too cold. These issues are addressed through the implementation of a more accurate radiation scheme at short wavelengths. Despite these problems we show that this new CNRM CCM is a useful tool to study chemistry-climate applications.
Discussion Paper (PDF, 2259 KB) Interactive Discussion (Closed, 6 Comments) Final Revised Paper (GMD)
Notice on Discussion StatusCitation: Michou, M., Saint-Martin, D., Teyssèdre, H., Alias, A., Karcher, F., Olivié, D., Voldoire, A., Josse, B., Peuch, V.-H., Clark, H., Lee, J. N., and Chéroux, F.: A new version of the CNRM Chemistry-Climate Model, CNRM-CCM: description and improvements from the CCMVal-2 simulations, Geosci. Model Dev. Discuss., 4, 1129-1183, doi:10.5194/gmdd-4-1129-2011, 2011. Bibtex EndNote Reference Manager XML
