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| Titel |
Simulation of tropospheric chemistry and aerosols with the climate model EC-Earth |
| VerfasserIn |
T. P. C. Noije, P. Sager, A. J. Segers, P. F. J. Velthoven, M. C. Krol, W. Hazeleger, A. G. Williams, S. D. Chambers |
| 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 (2014-10-22), S.2435-2475 |
| Datensatznummer |
250115742
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| Publikation (Nr.) |
 copernicus.org/gmd-7-2435-2014.pdf |
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| Zusammenfassung |
| We have integrated the atmospheric chemistry and transport model
TM5 into
the global climate model EC-Earth version 2.4. We present an overview of the
TM5 model and the two-way data exchange between TM5 and the IFS model from
the European Centre for Medium-Range Weather Forecasts (ECMWF), the
atmospheric general circulation model of EC-Earth. In this paper we evaluate
the simulation of tropospheric chemistry and aerosols in a one-way coupled
configuration. We have carried out a decadal simulation for present-day
conditions and calculated chemical budgets and climatologies of tracer
concentrations and aerosol optical depth. For comparison we have also
performed offline simulations driven by meteorological fields from ECMWF's
ERA-Interim reanalysis and output from the EC-Earth model itself. Compared
to the offline simulations, the online-coupled system produces more
efficient vertical mixing in the troposphere, which reflects an improvement
of the treatment of cumulus convection. The chemistry in the EC-Earth
simulations is affected by the fact that the current version of EC-Earth
produces a cold bias with too dry air in large parts of the troposphere.
Compared to the ERA-Interim driven simulation, the oxidizing capacity in
EC-Earth is lower in the tropics and higher in the extratropics. The
atmospheric lifetime of methane in EC-Earth is 9.4 years, which is 7%
longer than the lifetime obtained with ERA-Interim but remains well within
the range reported in the literature. We further evaluate the model by
comparing the simulated climatologies of surface radon-222 and carbon
monoxide, tropospheric and surface ozone, and aerosol optical depth against
observational data. The work presented in this study is the first step in
the development of EC-Earth into an Earth system model with fully
interactive atmospheric chemistry and aerosols. |
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