Simulation of tropospheric chemistry and aerosols with the climate model EC-Earth
| Autor: | Maarten Krol, Arjo Segers, P. F. J. van Velthoven, Wilco Hazeleger, P. Le Sager, T. P. C. van Noije, Alastair G. Williams, Scott D. Chambers |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Meteorologie en Luchtkwaliteit
aerosol property atmospheric chemistry Meteorology Meteorology and Air Quality transport models Urbanisation general-circulation model Environment Atmospheric sciences intercomparison project accmip optical depth Methane Troposphere stratospheric ozone chemistry.chemical_compound vertical mixing TRACER Ozone layer dry deposition parameterization climate modeling Optical depth sulfur emissions WIMEK decadal variation methane Earth / Environmental lcsh:QE1-996.5 climatology boundary-layer CAS - Climate Air and Sustainability lcsh:Geology Boundary layer troposphere chemistry global-models Atmospheric chemistry Climate model ELSS - Earth Life and Social Sciences Environment & Sustainability global climate modified band approach |
| Zdroj: | Geoscientific Model Development, Vol 7, Iss 5, Pp 2435-2475 (2014) Geoscientific Model Development, 7(5), 2435-2475 Geoscientific Model Development, 5, 7, 2435-2475 Geoscientific Model Development 7 (2014) 5 |
| ISSN: | 1991-9603 1991-959X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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