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

S.-W. Son. 1 E. P. Gerber 2 J. Perlwitz 3, 4 L. M. Polvani 5, 6 N. P. Gillett 7 K.-H. Seo 8 V. Eyring 9 T. G. Shepherd 10 D. Waugh 11 H. Akiyoshi 12 J. Austin 13 A. Baumgaertner 14 Slimane Bekki 15 P. Braesicke 16 C. Bruhl 14 N. Butchart 17 M. P. Chipperfield 18 David Cugnet 15 M. Dameris 9 S. Dhomse 18 S. Frith 19 H. Garny 9 R. Garcia 20 S. C. Hardiman 17 P. Jockel 9, 14 J. F. Lamarque 20 E. Mancini 21 Marion Marchand 15 M. Michou 22 T. Nakamura 12 Olaf Morgenstern 23, 16 G. Pitari 21 D. A. Plummer 7 J. Pyle 16 E. Rozanov 24, 25 J. F. Scinocca 7 K. Shibata 26 Dan Smale 23 H. Teyssedre 22 W. Tian 18 Y. Yamashita 12
Abstract : The impact of stratospheric ozone on the tropospheric general circulation of theSouthern Hemisphere (SH) is examined with a set of chemistry‐climate models participatingin the Stratospheric Processes and their Role in Climate (SPARC)/Chemistry‐ClimateModel Validation project phase 2 (CCMVal‐2). Model integrations of both the past andfuture climates reveal the crucial role of stratospheric ozone in driving SH circulationchange: stronger ozone depletion in late spring generally leads to greater polewarddisplacement and intensification of the tropospheric midlatitude jet, and greater expansion ofthe SH Hadley cell in the summer. These circulation changes are systematic as polewarddisplacement of the jet is typically accompanied by intensification of the jet and expansion ofthe Hadley cell. Overall results are compared with coupled models participating in theIntergovernmental Panel on Climate Change Fourth Assessment Report (IPCC AR4), andpossible mechanisms are discussed. While the tropospheric circulation response appearsquasi‐linearly related to stratospheric ozone changes, the quantitative response to a givenforcing varies considerably from one model to another. This scatter partly results fromdifferences in model climatology. It is shown that poleward intensification of the westerly jetis 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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S.-W. Son., E. P. Gerber, J. Perlwitz, L. M. Polvani, N. P. Gillett, et al.. Impact of stratospheric ozone on Southern Hemisphere circulation change: A multimodel assessment. Journal of Geophysical Research: Atmospheres, American Geophysical Union, 2010, 115 (D3), pp.D00M07. ⟨10.1029/2010JD014271⟩. ⟨hal-00510592⟩

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