Geosci. Model Dev. Discuss., 5, 2445-2502, 2012
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This discussion paper has been under review for the journal Geoscientific Model Development (GMD). Please refer to the corresponding final paper in GMD.
The Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP): overview and description of models, simulations and climate diagnostics
J.-F. Lamarque1, D. T. Shindell2, B. Josse3, P. J. Young4,5, I. Cionni6, V. Eyring7, D. Bergmann8, P. Cameron-Smith8, W. J. Collins9, R. Doherty10, S. Dalsoren11, G. Faluvegi2, G. Folberth9, S. J. Ghan12, L. W. Horowitz13, Y. H. Lee2, I. A. MacKenzie10, T. Nagashima14, V. Naik15, D. Plummer16, M. Righi7, S. Rumbold9, M. Schulz17, R. B. Skeie11, D. S. Stevenson10, S. Strode18,19, K. Sudo14, S. Szopa20, A. Voulgarakis21, and G. Zeng22
1NCAR Earth System Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
2NASA Goddard Institute for Space Studies and Columbia Earth Institute, New York, NY, USA
3GAME/CNRM, Météo-France, CNRS – Centre National de Recherches Météorologiques, Toulouse, France
4Cooperative Institute for Research in the Environmental Sciences, University of Colorado-Boulder, Boulder, CO, USA
5Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
6Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile (ENEA), Bologna, Italy
7Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany
8Lawrence Livermore National Laboratory, Livermore, CA, USA
9Hadley Centre for Climate Prediction, Met Office, Exeter, UK
10School of Geosciences, University of Edinburgh, Edinburgh, UK
11Center for International Climate and Environmental Research-Oslo (CICERO), Oslo, Norway
12Pacific Northwest National Laboratory, Richland, WA, USA
13NOAA Geophysical Fluid Dynamics Laboratory, Princeton, NJ, USA
14Frontier Research Center for Global Change, Japan Marine Science and Technology Center, Yokohama, Japan
15UCAR/NOAA Geophysical Fluid Dynamics Laboratory, Princeton, NJ, USA
16Canadian Centre for Climate Modeling and Analysis, Environment Canada, Victoria, British Columbia, Canada
17Meteorologisk Institutt, Oslo, Norway
18NASA Goddard Space Flight Center, Greenbelt, MD, USA
19Universities Space Research Association, Columbia, MD, USA
20Laboratoire des Sciences du Climat et de l'Environnement, CEA/CNRS/UVSQ/IPSL, Gif-sur-Yvette, France
21Department of Physics, Imperial College, London, UK
22National Institute of Water and Atmospheric Research, Lauder, New Zealand

Abstract. The Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP) consists of a series of timeslice experiments targeting the long-term changes in atmospheric composition between 1850 and 2100, with the goal of documenting radiative forcing and the associated composition changes. Here we introduce the various simulations performed under ACCMIP and the associated model output. The ACCMIP models have a wide range of horizontal and vertical resolutions, vertical extent, chemistry schemes and interaction with radiation and clouds. While anthropogenic and biomass burning emissions were specified for all time slices in the ACCMIP protocol, it is found that the natural emissions lead to a significant range in emissions, mostly for ozone precursors. The analysis of selected present-day climate diagnostics (precipitation, temperature, specific humidity and zonal wind) reveals biases consistent with state-of-the-art climate models. The model-to-model comparison of changes in temperature, specific humidity and zonal wind between 1850 and 2000 and between 2000 and 2100 indicates mostly consistent results, but with outliers different enough to possibly affect their representation of climate impact on chemistry.

Citation: Lamarque, J.-F., Shindell, D. T., Josse, B., Young, P. J., Cionni, I., Eyring, V., Bergmann, D., Cameron-Smith, P., Collins, W. J., Doherty, R., Dalsoren, S., Faluvegi, G., Folberth, G., Ghan, S. J., Horowitz, L. W., Lee, Y. H., MacKenzie, I. A., Nagashima, T., Naik, V., Plummer, D., Righi, M., Rumbold, S., Schulz, M., Skeie, R. B., Stevenson, D. S., Strode, S., Sudo, K., Szopa, S., Voulgarakis, A., and Zeng, G.: The Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP): overview and description of models, simulations and climate diagnostics, Geosci. Model Dev. Discuss., 5, 2445-2502, doi:10.5194/gmdd-5-2445-2012, 2012.
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