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| Titel |
The coupled atmosphere–chemistry–ocean model SOCOL-MPIOM |
| VerfasserIn |
S. Muthers, J. G. Anet, A. Stenke, C. C. Raible, E. Rozanov, S. Brönnimann, T. Peter, F. X. Arfeuille, A. I. Shapiro, J. Beer, F. Steinhilber, Y. Brugnara, W. Schmutz |
| 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 ; 7, no. 5 ; Nr. 7, no. 5 (2014-09-25), S.2157-2179 |
| Datensatznummer |
250115727
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| Publikation (Nr.) |
 copernicus.org/gmd-7-2157-2014.pdf |
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| Zusammenfassung |
The newly developed atmosphere–ocean–chemistry–climate model
SOCOL-MPIOM is presented by demonstrating the influence of
chemistry–climate interactions
on the climate state and the
variability. Therefore, we compare pre-industrial control
simulations with (CHEM) and without (NOCHEM) interactive chemistry.
In general, the influence of the chemistry on the mean state and the
variability is small and mainly restricted to the stratosphere and
mesosphere. The atmospheric
dynamics mainly differ in polar regions, with slightly stronger
polar vortices in the austral and boreal winter, respectively.
The strengthening of the
vortex is related to larger stratospheric temperature gradients,
which are attributed to a parameterisation of the absorption of ozone
and oxygen in different wavelength intervals, which is
considered in the version with interactive
chemistry only. A second reason for the temperature differences
between CHEM and NOCHEM is related to diurnal variations in the
ozone concentrations in the higher atmosphere, which are missing in
NOCHEM. Furthermore, stratospheric water vapour concentrations
substantially differ between the two experiments, but their effect
on temperature is small. In both setups, the simulated
intensity and variability of the northern polar vortex is inside the
range of present-day observations.
Additionally, the performance of SOCOL-MPIOM under changing external
forcings is assessed for the period 1600–2000 using an ensemble of
simulations.
In the industrial period from 1850 onward SOCOL-MPIOM overestimates
the global mean surface air temperature increase in comparison to observational data sets.
Sensitivity simulations show that this overestimation can be
attributed to a combination of factors:
the solar forcing reconstruction, the simulated ozone changes,
and incomplete
aerosol effects and land use changes. |
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