Comparison of Arctic and Antarctic Stratospheric Climates in Chemistry Versus No-Chemistry Climate Models ...

• Main Authors: Morgenstern, Olaf, Kinnison, Douglas E., Mills, Michael, Michou, Martine, Horowitz, Larry W., Lin, Pu, Deushi, Makoto, Yoshida, Kohei, O'Connor, Fiona M., Tang, Yongming, Abraham, N. Luke, Keeble, James, Dennison, Fraser, Rozanov, Eugene, Egorova, Tatiana, Sukhodolov, Timofei, Zeng, Guang
• Format: Article in Journal/Newspaper
• Language: English
• Published: ETH Zurich 2022
• Subjects: ozone-climate interaction; ozone depletion; deep coupling; climate model; tuning; non-orographic gravity wave; Antarc*; Antarctic; Arctic
• Online Access: https://dx.doi.org/10.3929/ethz-b-000579353; http://hdl.handle.net/20.500.11850/579353

Using nine chemistry-climate and eight associated no-chemistry models, we investigate the persistence and timing of cold episodes occurring in the Arctic and Antarctic stratosphere during the period 1980-2014. We find systematic differences in behavior between members of these model pairs. In a first group of chemistry models whose dynamical configurations mirror their no-chemistry counterparts, we find an increased persistence of such cold polar vortices, such that these cold episodes often start earlier and last longer, relative to the times of occurrence of the lowest temperatures. Also the date of occurrence of the lowest temperatures, both in the Arctic and the Antarctic, is often delayed by 1-3 weeks in chemistry models, versus their no-chemistry counterparts. This behavior exacerbates a widespread problem occurring in most or all models, a delayed occurrence, in the median, of the most anomalously cold day during such cold winters. In a second group of model pairs there are differences beyond just ... : Journal of Geophysical Research: Atmospheres, 127 (20) ...