Preprints
https://doi.org/10.5194/egusphere-2023-495
https://doi.org/10.5194/egusphere-2023-495
27 Mar 2023
 | 27 Mar 2023

Injection strategy – a driver of atmospheric circulation and ozone response to stratospheric aerosol geoengineering

Ewa M. Bednarz, Amy H. Butler, Daniele Visioni, Yan Zhang, Ben Kravitz, and Douglas G. MacMartin

Abstract. Despite offsetting global mean surface temperature, various studies demonstrated that Stratospheric Aerosol Injection (SAI) could influence the recovery of stratospheric ozone and have important impacts on stratospheric and tropospheric circulation, thereby potentially playing an important role in modulating regional and seasonal climate variability. However, so far most of the assessments of such an approach have come from climate model simulations in which SO2 is injected only in a single location or a set of locations.

Here we use CESM2-WACCM6 SAI simulations under a comprehensive set of SAI strategies achieving the same global mean surface temperature with different locations and/or timing of injections: an equatorial injection, an annual injection of equal amounts of SO2 at 15° N and 15° S, an annual injection of equal amounts of SO2 at 30° N and 30° S, and a polar strategy injecting SO2 at 60° N and 60° S only in spring in each hemisphere.

We demonstrate that despite achieving the same global mean surface temperature, the different strategies result in contrastingly different magnitudes of the aerosol-induced lower stratospheric warming, stratospheric moistening, strengthening of stratospheric polar jets in both hemispheres and changes in the speed of the residual circulation. In conjunction with the differences in direct radiative impacts at the surface, these drive different impacts on the extratropical modes of variability (Northern and Southern Annular Mode), including important consequences on the northern winter surface climate, as well as on the intensity of tropical tropospheric Walker and Hadley Circulations, which drive tropical precipitation patterns. Finally, we demonstrate that the choice of injection strategy also plays a first-order role in the future evolution of stratospheric ozone under SAI throughout the globe. Overall, our results contribute to an increased understanding of the fine interplay of various radiative, dynamical and chemical processes driving the atmospheric response to SAI, as well as lay the ground for designing an optimal SAI strategy that could form a basis of future multi-model intercomparisons.

Journal article(s) based on this preprint

03 Nov 2023
Injection strategy – a driver of atmospheric circulation and ozone response to stratospheric aerosol geoengineering
Ewa M. Bednarz, Amy H. Butler, Daniele Visioni, Yan Zhang, Ben Kravitz, and Douglas G. MacMartin
Atmos. Chem. Phys., 23, 13665–13684, https://doi.org/10.5194/acp-23-13665-2023,https://doi.org/10.5194/acp-23-13665-2023, 2023
Short summary
Ewa M. Bednarz, Amy H. Butler, Daniele Visioni, Yan Zhang, Ben Kravitz, and Douglas G. MacMartin

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-495', Ulrike Niemeier, 20 Apr 2023
  • RC2: 'Comment on egusphere-2023-495', Anonymous Referee #2, 07 Jun 2023
  • RC3: 'Comment on egusphere-2023-495', Gabriel Chiodo, 27 Jun 2023
  • AC1: 'Authors response to all reviewers comments', Ewa Bednarz, 29 Aug 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-495', Ulrike Niemeier, 20 Apr 2023
  • RC2: 'Comment on egusphere-2023-495', Anonymous Referee #2, 07 Jun 2023
  • RC3: 'Comment on egusphere-2023-495', Gabriel Chiodo, 27 Jun 2023
  • AC1: 'Authors response to all reviewers comments', Ewa Bednarz, 29 Aug 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Ewa Bednarz on behalf of the Authors (29 Aug 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Publish subject to technical corrections (08 Sep 2023) by Simone Tilmes
AR by Ewa Bednarz on behalf of the Authors (09 Sep 2023)  Manuscript 

Journal article(s) based on this preprint

03 Nov 2023
Injection strategy – a driver of atmospheric circulation and ozone response to stratospheric aerosol geoengineering
Ewa M. Bednarz, Amy H. Butler, Daniele Visioni, Yan Zhang, Ben Kravitz, and Douglas G. MacMartin
Atmos. Chem. Phys., 23, 13665–13684, https://doi.org/10.5194/acp-23-13665-2023,https://doi.org/10.5194/acp-23-13665-2023, 2023
Short summary
Ewa M. Bednarz, Amy H. Butler, Daniele Visioni, Yan Zhang, Ben Kravitz, and Douglas G. MacMartin
Ewa M. Bednarz, Amy H. Butler, Daniele Visioni, Yan Zhang, Ben Kravitz, and Douglas G. MacMartin

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Short summary
We use a state-of-the-art earth system model and a set of stratospheric aerosol injection strategies achieving the same level of global mean surface cooling through different combinations of location and/or timing of the injection. We demonstrate that the choice of SAI strategy can lead to contrasting impacts on stratospheric and tropospheric temperatures, circulation and chemistry (including stratospheric ozone), thereby leading to different impacts on regional surface climate.