Comparison of Arctic and Antarctic Stratospheric Climates in Chemistry Versus No-Chemistry Climate Models - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Journal of Geophysical Research: Atmospheres Year : 2022

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

Olaf Morgenstern
  • Function : Author
Douglas E. Kinnison
  • Function : Author
Michael Mills
  • Function : Author
Larry W. Horowitz
  • Function : Author
Pu Lin
  • Function : Author
Makoto Deushi
  • Function : Author
Kohei Yoshida
  • Function : Author
Fiona M. O'Connor
  • Function : Author
Yongming Tang
  • Function : Author
N. Luke Abraham
  • Function : Author
James Keeble
  • Function : Author
Fraser Dennison
  • Function : Author
Eugene Rozanov
  • Function : Author
Tatiana Egorova
  • Function : Author
Timofei Sukhodolov
  • Function : Author
Guang Zeng
  • Function : Author

Abstract

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 ozone chemistry. In particular, here the chemistry models feature more levels in the stratosphere, a raised model top, and differences in non-orographic gravity wave drag versus their no-chemistry counterparts. Such additional dynamical differences can completely mask the above influence of ozone chemistry. The results point toward a need to retune chemistry-climate models versus their no-chemistry counterparts.
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insu-03863727 , version 1 (21-11-2022)

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Olaf Morgenstern, Douglas E. Kinnison, Michael Mills, Martine Michou, Larry W. Horowitz, et al.. Comparison of Arctic and Antarctic Stratospheric Climates in Chemistry Versus No-Chemistry Climate Models. Journal of Geophysical Research: Atmospheres, 2022, 127, ⟨10.1029/2022JD037123⟩. ⟨insu-03863727⟩
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