Abstract
The Southern Hemisphere (SH) zonal-mean circulation change in response to Antarctic ozone depletion is re-visited by examining a set of the latest model simulations archived for the Chemistry-Climate Model Initiative (CCMI) project. All models reasonably well reproduce Antarctic ozone depletion in the late 20th century. The related SH-summer circulation changes, such as a poleward intensification of westerly jet and a poleward expansion of the Hadley cell, are also well captured. All experiments exhibit quantitatively the same multi-model mean trend, irrespective of whether the ocean is coupled or prescribed. Results are also quantitatively similar to those derived from the Coupled Model Intercomparison Project phase 5 (CMIP5) high-top model simulations in which the stratospheric ozone is mostly prescribed with monthly- and zonally-averaged values. These results suggest that the ozone-hole-induced SH-summer circulation changes are robust across the models irrespective of the specific chemistry-atmosphere-ocean coupling.
Highlights
The Southern Hemisphere (SH) general circulation underwent distinct changes in the late 20th century
The detailed mechanism(s) remains to be determined, similar results are seen in multi-model ensembles, e.g. the Coupled Model Intercomparison Project (CMIP) phase 3 or 5 (Meehl et al 2007, Taylor et al 2012) and the Chemistry-Climate Model Validation activity 2 (CCMVal2; Eyring et al 2010), stressing that Antarctic ozone hole has played a predominant role in the austral-summer SH circulation changes in the late 20th century (Son et al 2009, Min and Son 2013, Gerber and Son 2014, Tao et al 2016, Choi et al 2018)
We address whether up-to-date CCMs, which have
Summary
Tropospheric jet response to Antarctic ozone depletion: An update with Chemistry-Climate Model Initiative (CCMI). Seok-Woo Son1,22 , Bo-Reum Han, Chaim I Garfinkel, Seo-Yeon Kim, Rokjin Park, N Luke Abraham, Hideharu Akiyoshi, Alexander T Archibald3,4 , N Butchart, Martyn P Chipperfield, Martin Dameris, Makoto Deushi, Sandip S Dhomse, Steven C Hardiman , Patrick Jockel, Douglas Kinnison, Martine Michou, Olaf Morgenstern, Fiona M O’Connor, Luke D Oman, David A Plummer, Andrea Pozzer, Laura E Revell, Eugene Rozanov, Andrea Stenke, Kane Stone, Simone Tilmes, Yousuke Yamashita and Guang Zeng
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