Impact of stratospheric ozone on Southern Hemisphere circulation change: A multimodel assessment

The impact of stratospheric ozone on the tropospheric general circulation of the Southern Hemisphere (SH) is examined with a set of chemistry-climate models participating in the Stratospheric Processes and their Role in Climate (SPARC)/Chemistry-Climate Model Validation project phase 2 (CCMVal-2). Model integrations of both the past and future climates reveal the crucial role of stratospheric ozone in driving SH circulation change: stronger ozone depletion in late spring generally leads to greater poleward displacement and intensification of the tropospheric midlatitude jet, and greater expansion of the SH Hadley cell in the summer. These circulation changes are systematic as poleward displacement of the jet is typically accompanied by intensification of the jet and expansion of the Hadley cell. Overall results are compared with coupled models participating in the Intergovernmental Panel on Climate Change Fourth Assessment Report (IPCC AR4), and possible mechanisms are discussed. While the tropospheric circulation response appears quasi-linearly related to stratospheric ozone changes, the quantitative response to a given forcing varies considerably from one model to another. This scatter partly results from differences in model climatology. It is shown that poleward intensification of the westerly jet is generally stronger in models whose climatological jet is biased toward lower latitudes. This result is discussed in the context of quasi-geostrophic zonal mean dynamics.

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An edited version of this paper was published by AGU. Copyright 2010 American Geophysical Union.
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Author Son, S.-W.
Gerber, E.
Perlwitz, J.
Polvani, L.
Gillett, N.
Seo, K.-H.
Eyring, V.
Shepherd, T.
Waugh, D.
Akiyoshi, H.
Austin, J.
Baumgaertner, A.
Bekki, S.
Braesicke, P.
Brüehl, C.
Butchart, N.
Chipperfield, M.
Cugnet, D.
Dameris, M.
Dhomse, S.
Frith, S.
Garny, H.
Garcia, Rolando
Hardiman, S.
Jöeckel, P.
Lamarque, Jean-Francois
Mancini, E.
Marchand, M.
Michou, M.
Nakamura, T.
Morgenstern, O.
Pitari, G.
Plummer, D.
Pyle, J.
Rozanov, E.
Scinocca, J.
Shibata, K.
Smale, D.
Teyssedre, H.
Tian, W.
Yamashita, Y.
Publisher UCAR/NCAR - Library
Publication Date 2010-10-13T00:00:00
Digital Object Identifier (DOI) Not Assigned
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Resource Version N/A
Topic Category geoscientificInformation
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Metadata Date 2023-08-18T18:51:40.551766
Metadata Record Identifier edu.ucar.opensky::articles:10714
Metadata Language eng; USA
Suggested Citation Son, S.-W., Gerber, E., Perlwitz, J., Polvani, L., Gillett, N., Seo, K.-H., Eyring, V., Shepherd, T., Waugh, D., Akiyoshi, H., Austin, J., Baumgaertner, A., Bekki, S., Braesicke, P., Brüehl, C., Butchart, N., Chipperfield, M., Cugnet, D., Dameris, M., Dhomse, S., Frith, S., Garny, H., Garcia, Rolando, Hardiman, S., Jöeckel, P., Lamarque, Jean-Francois, Mancini, E., Marchand, M., Michou, M., Nakamura, T., Morgenstern, O., Pitari, G., Plummer, D., Pyle, J., Rozanov, E., Scinocca, J., Shibata, K., Smale, D., Teyssedre, H., Tian, W., Yamashita, Y.. (2010). Impact of stratospheric ozone on Southern Hemisphere circulation change: A multimodel assessment. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d7kp82p4. Accessed 22 June 2025.

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