Atmos. Chem. Phys. Discuss., 12, 21615-21677, 2012
© Author(s) 2012. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Pre-industrial to end 21st century projections of tropospheric ozone from the Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP)
P. J. Young1,2, A. T. Archibald3,4, K. W. Bowman5, J.-F. Lamarque6, V. Naik7, D. S. Stevenson8, S. Tilmes6, A. Voulgarakis9, O. Wild10, D. Bergmann11, P. Cameron-Smith11, I. Cionni12, W. J. Collins13, S. B. Dalsøren14, R. M. Doherty8, V. Eyring15, G. Faluvegi16, L. W. Horowitz17, B. Josse18, Y. H. Lee16, I. A. MacKenzie8, T. Nagashima19, D. A. Plummer20, M. Righi15, S. T. Rumbold13, R. B. Skeie14, D. T. Shindell16, S. A. Strode21,22, K. Sudo23, S. Szopa24, and G. Zeng25
1Cooperative Institute for Research in the Environmental Sciences, University of Colorado-Boulder, Boulder, Colorado, USA
2Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, Colorado, USA
3Centre for Atmospheric Science, University of Cambridge, UK
4National Centre for Atmospheric Science, University of Cambridge, UK
5NASA Jet Propulsion Laboratory, Pasadena, California, USA
6National Center for Atmospheric Research, Boulder, Colorado, USA
7UCAR/NOAA Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey, USA
8School of GeoSciences, University of Edinburgh, Edinburgh, UK
9Department of Physics, Imperial College, London, UK
10Lancaster Environment Centre, University of Lancaster, Lancaster, UK
11Lawrence Livermore National Laboratory, Livermore, California, USA
12Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile (ENEA), Bologna, Italy
13Met Office Hadley Centre, Exeter, UK
14CICERO, Center for International Climate and Environmental Research-Oslo, Oslo, Norway
15Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany
16NASA Goddard Institute for Space Studies, and Columbia Earth Institute, Columbia University, New York City, New York, USA
17NOAA Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey, USA
18GAME/CNRM, Météo-France, CNRS – Centre National de Recherches Météorologiques, Toulouse, France
19Frontier Research Center for Global Change, Japan Marine Science and Technology Center, Yokohama, Japan
20Canadian Centre for Climate Modeling and Analysis, Environment Canada, Victoria, British Columbia, Canada
21NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
22Universities Space Research Association, Columbia, Maryland, USA
23Department of Earth and Environmental Science, Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan
24Laboratoire des Sciences du Climat et de l'Environnement, LSCE-CEA-CNRS-UVSQ, Gif-sur-Yvette, France
25National Institute of Water and Atmospheric Research, Lauder, New Zealand

Abstract. Present day tropospheric ozone and its changes between 1850 and 2100 are considered, analysing 15 global models that participated in the Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP). The multi-model mean compares well against present day observations. The seasonal cycle correlates well, except for some locations in the tropical upper troposphere. Most (75%) of the models are encompassed with a range of global mean tropospheric ozone column estimates from satellite data, although there is a suggestion of a high bias in the Northern Hemisphere and a low bias in the Southern Hemisphere. Compared to the present day multi-model mean tropospheric ozone burden of 337 Tg, the multi-model mean burden for 1850 time slice is ~ 30% lower. Future changes were modelled using emissions and climate projections from four Representative Concentration Pathways (RCPs). Compared to 2000, the relative changes for the tropospheric ozone burden in 2030 (2100) for the different RCPs are: −5% (−22%) for RCP2.6, 3% (−8%) for RCP4.5, 0% (−9%) for RCP6.0, and 5% (15%) for RCP8.5. Model agreement on the magnitude of the change is greatest for larger changes. Reductions in precursor emissions are common across the RCPs and drive ozone decreases in all but RCP8.5, where doubled methane and a larger stratospheric influx increase ozone. Models with high ozone abundances for the present day also have high ozone levels for the other time slices, but there are no models consistently predicting large or small changes. Spatial patterns of ozone changes are well correlated across most models, but are notably different for models without time evolving stratospheric ozone concentrations. A unified approach to ozone budget specifications is recommended to help future studies attribute ozone changes and inter-model differences more clearly.

Citation: Young, P. J., Archibald, A. T., Bowman, K. W., Lamarque, J.-F., Naik, V., Stevenson, D. S., Tilmes, S., Voulgarakis, A., Wild, O., Bergmann, D., Cameron-Smith, P., Cionni, I., Collins, W. J., Dalsøren, S. B., Doherty, R. M., Eyring, V., Faluvegi, G., Horowitz, L. W., Josse, B., Lee, Y. H., MacKenzie, I. A., Nagashima, T., Plummer, D. A., Righi, M., Rumbold, S. T., Skeie, R. B., Shindell, D. T., Strode, S. A., Sudo, K., Szopa, S., and Zeng, G.: Pre-industrial to end 21st century projections of tropospheric ozone from the Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP), Atmos. Chem. Phys. Discuss., 12, 21615-21677, doi:10.5194/acpd-12-21615-2012, 2012.
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