Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/8118
Title: Simulation of tropospheric chemistry and aerosols with the climate model EC-Earth
Authors: van Noije, TPC
Le Sager, P
Segers, AJ
van Velthoven, PFJ
Krol, MC
Hazeleger, W
Williams, AG
Chambers, SD
Keywords: Atmospheric chemistry
Climate models
Aerosols
Troposphere
Simulation
Radon 222
Carbon monoxide
Ozone
Issue Date: 22-Oct-2014
Publisher: Copernicus Publications
Citation: Van Noije, T. P. C., Le Sager, P., Segers, A. J., Van Velthoven, P. F. J., Krol, M. C., Hazeleger, W., Williams, A. G. & Chambers, S. D. (2014). Simulation of tropospheric chemistry and aerosols with the climate model EC-earth. Geoscientific Model Development, 7(5), 2435-2475. doi: http://www.geosci-model-dev.net/7/2435/2014/gmd-7-2435-2014.html
Abstract: 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.© 2014, Author(s).
Gov't Doc #: 7662
URI: https://doi.org/10.5194/gmd-7-2435-2014
http://apo.ansto.gov.au/dspace/handle/10238/8118
ISSN: 2435-2475
Appears in Collections:Journal Articles

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