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https://doi.org/10.5194/acp-2020-441
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-441
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  03 Jun 2020

03 Jun 2020

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A revised version of this preprint was accepted for the journal ACP.

Sensitivity of the southern hemisphere tropospheric jet response to Antarctic ozone depletion: prescribed versus interactive chemistry

Sabine Haase1, Jaika Fricke1, Tim Kruschke2, Sebastian Wahl1, and Katja Matthes1,3 Sabine Haase et al.
  • 1GEOMAR Helmholtz Center for Ocean Research Kiel, Kiel, Germany
  • 2Swedish Meteorological and Hydrological Institute - Rossby Centre, Norrköping, Sweden
  • 3Christian-Albrechts-Universität zu Kiel, Kiel, Germany

Abstract. Southern hemisphere lower stratospheric ozone depletion has been shown to lead to a poleward shift of the tropospheric jet stream during austral summer, influencing surface atmosphere and ocean conditions, such as surface temperatures and sea ice extent. The characteristics of stratospheric and tropospheric responses to ozone depletion, however, differ largely among climate models depending on the representation of ozone in the models.

The most accurate way to represent ozone in a model is to calculate it interactively. However, due to computational costs, in particular for long-term coupled ocean-atmosphere model integrations, the more common way is to prescribe ozone from observations or calculated model fields. Here, we investigate the difference between an interactive and a specified chemistry version of the same atmospheric model in a fully-coupled setup using a 9-member chemistry-climate model ensemble. In the specified chemistry version of the model the ozone fields are prescribed using the output from the interactive chemistry model version. In contrast to earlier studies, we use daily-resolved ozone fields in the specified chemistry simulations to achieve a better comparability between the ozone forcing with and without interactive chemistry. We find that although the short-wave heating rate trend in response to ozone depletion is the same in the different chemistry settings, the interactive chemistry ensemble shows a stronger trend in polar cap stratospheric temperatures (by about 0.7 K per decade) and circumpolar stratospheric zonal mean zonal winds (by about 1.6 m/s per decade) as compared to the specified chemistry ensemble. This difference between interactive and specified chemistry in the stratospheric response to ozone depletion also affects the tropospheric response, namely the poleward shift of the tropospheric jet stream. We attribute part of these differences to the missing representation of feedbacks between chemistry and dynamics in the specified chemistry ensemble, which affect the dynamical heating rates, and part of it to the lack of spatial asymmetries in the prescribed ozone fields. This effect is investigated using a sensitivity ensemble that was forced by a three-dimensional instead of a two–dimensional ozone field.

This study emphasizes the value of interactive chemistry for the representation of the southern hemisphere tropospheric jet response to ozone depletion and infers that for periods with strong ozone variability (trends) the details of the ozone forcing can be crucial for representing southern hemispheric climate variability.

Sabine Haase et al.

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Haase et al. 2020 - Sensitivity of the southern hemisphere tropospheric jet response to Antarctic ozone depletion: prescribed versus interactive chemistry S. Haase https://doi.org/10.5281/zenodo.3785404

Sabine Haase et al.

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Short summary
Ozone depletion over Antarctica was shown to influence the tropospheric circumpolar jet in the Southern Hemisphere. Here, we investigate the atmospheric response to ozone depletion comparing climate model ensembles with interactive and prescribed ozone fields. We show that allowing feedbacks between ozone chemistry, radiation and dynamics as well as including asymmetries in ozone, leads to a strengthened ozone depletion signature in the atmosphere that reaches down to the surface in summer.
Ozone depletion over Antarctica was shown to influence the tropospheric circumpolar jet in the...
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