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| Titel |
A new tropospheric and stratospheric Chemistry and Transport Model MOCAGE-Climat for multi-year studies: evaluation of the present-day climatology and sensitivity to surface processes |
| VerfasserIn |
H. Teyssèdre, M. Michou, H. L. Clark, B. Josse, F. Karcher, D. Olivié, V.-H. Peuch, D. Saint-Martin, D. Cariolle, J.-L. Attié, P. Nédélec, P. Ricaud, V. Thouret, R. J. van der A, A. Volz-Thomas, F. Chéroux |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 7, no. 22 ; Nr. 7, no. 22 (2007-11-26), S.5815-5860 |
| Datensatznummer |
250005261
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| Publikation (Nr.) |
 copernicus.org/acp-7-5815-2007.pdf |
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| Zusammenfassung |
| We present the configuration of the Météo-France Chemistry and Transport
Model (CTM) MOCAGE-Climat that will be dedicated to the study of chemistry
and climate interactions. MOCAGE-Climat is a state-of-the-art CTM that
simulates the global distribution of ozone and its precursors (82 chemical
species) both in the troposphere and the stratosphere, up to the
mid-mesosphere (~70 km). Surface processes (emissions, dry deposition),
convection, and scavenging are explicitly described in the model that has
been driven by the ECMWF operational analyses of the period 2000–2005, on
T21 and T42 horizontal grids and 60 hybrid vertical levels, with and without
a procedure that reduces calculations in the boundary layer, and with on-line
or climatological deposition velocities. Model outputs have been compared to
available observations, both from satellites (TOMS, HALOE, SMR, SCIAMACHY,
MOPITT) and in-situ instrument measurements (ozone sondes, MOZAIC and
aircraft campaigns) at climatological timescales. The distribution of
long-lived species is in fair agreement with observations in the stratosphere
putting aside the shortcomings associated with the large-scale circulation.
The variability of the ozone column, both spatially and temporarily, is
satisfactory. However, because the Brewer-Dobson circulation is too fast, too
much ozone is accumulated in the lower to mid-stratosphere at the end of
winter. Ozone in the UTLS region does not show any systematic bias. In the
troposphere better agreement with ozone sonde measurements is obtained at mid
and high latitudes than in the tropics and differences with observations are
the lowest in summer. Simulations using a simplified boundary layer lead to
larger ozone differences between the model and the observations up to the
mid-troposphere. NOx in the lowest troposphere is in general
overestimated, especially in the winter months over the Northern Hemisphere,
which may result from a positive bias in OH. Dry deposition fluxes of O3
and nitrogen species are within the range of values reported by recent
inter-comparison model exercises. The use of climatological deposition
velocities versus deposition velocities calculated on-line had greatest
impact on HNO3 and NO2 in the troposphere. |
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