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| Titel |
A new version of the CNRM Chemistry-Climate Model, CNRM-CCM: description and improvements from the CCMVal-2 simulations |
| VerfasserIn |
M. Michou, D. Saint-Martin, H. Teyssèdre, A. Alias, F. Karcher, D. Olivié, A. Voldoire, B. Josse, V.-H. Peuch, H. Clark, J. N. Lee, F. Chéroux |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 4, no. 4 ; Nr. 4, no. 4 (2011-10-06), S.873-900 |
| Datensatznummer |
250001911
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| Publikation (Nr.) |
 copernicus.org/gmd-4-873-2011.pdf |
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| Zusammenfassung |
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. |
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