Preprints
https://doi.org/10.5194/egusphere-2025-221
https://doi.org/10.5194/egusphere-2025-221
03 Feb 2025
 | 03 Feb 2025

The importance of stratocumulus clouds for projected warming patterns and circulation changes

Philipp Breul, Paulo Ceppi, and Peer Nowack

Abstract. Stratocumulus clouds are thought to exert a strong positive radiative feedback on climate change, but recent analyses suggest this feedback is widely under-represented in global climate models. To assess the broader implications of this model error for the modeled climate change responses, we investigate the impact of Pacific stratocumulus cloud feedback on projected warming patterns, equilibrium climate sensitivity and the tropical atmospheric circulation under increased CO2 concentrations. Using the Community Earth System Model with modifications to enhance low cloud cover sensitivity to sea surface temperature (SST) anomalies in Pacific stratocumulus regions, we find increased tropical SST variability and persistence, a higher equilibrium climate sensitivity, an enhanced east–west warming contrast across the tropical Pacific, and a stronger slow-down of the Walker circulation under 4×CO2 conditions. Our findings are supported by inter-model relationships across CMIP6 4×CO2 simulations. These results underscore the importance of accurately representing cloud feedback in climate models to predict future climate change impacts not only globally, but also on a regional scale, such as warming patterns or circulation change.

Competing interests: At least one of the (co-)authors is a member of the editorial board of Atmospheric Chemistry and Physics. The peer-review process was guided by an independent editor, and the authors also have no other competing interests to declare.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this paper. While Copernicus Publications makes every effort to include appropriate place names, the final responsibility lies with the authors. Views expressed in the text are those of the authors and do not necessarily reflect the views of the publisher.
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Journal article(s) based on this preprint

02 Oct 2025
The importance of stratocumulus clouds for projected warming patterns and circulation changes
Philipp Breul, Paulo Ceppi, and Peer Nowack
Atmos. Chem. Phys., 25, 11991–12005, https://doi.org/10.5194/acp-25-11991-2025,https://doi.org/10.5194/acp-25-11991-2025, 2025
Short summary
Philipp Breul, Paulo Ceppi, and Peer Nowack

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-221', Anonymous Referee #1, 25 Feb 2025
    • AC2: 'Reply on RC1', Philipp Breul, 11 Jun 2025
  • RC2: 'Comment on egusphere-2025-221', Anonymous Referee #2, 04 Apr 2025
    • AC1: 'Reply on RC2', Philipp Breul, 11 Jun 2025

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-221', Anonymous Referee #1, 25 Feb 2025
    • AC2: 'Reply on RC1', Philipp Breul, 11 Jun 2025
  • RC2: 'Comment on egusphere-2025-221', Anonymous Referee #2, 04 Apr 2025
    • AC1: 'Reply on RC2', Philipp Breul, 11 Jun 2025

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Philipp Breul on behalf of the Authors (11 Jun 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (13 Jun 2025) by Raphaela Vogel
RR by Anonymous Referee #1 (17 Jun 2025)
ED: Publish subject to minor revisions (review by editor) (13 Jul 2025) by Raphaela Vogel
AR by Philipp Breul on behalf of the Authors (17 Jul 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (17 Jul 2025) by Raphaela Vogel
AR by Philipp Breul on behalf of the Authors (17 Jul 2025)  Manuscript 

Journal article(s) based on this preprint

02 Oct 2025
The importance of stratocumulus clouds for projected warming patterns and circulation changes
Philipp Breul, Paulo Ceppi, and Peer Nowack
Atmos. Chem. Phys., 25, 11991–12005, https://doi.org/10.5194/acp-25-11991-2025,https://doi.org/10.5194/acp-25-11991-2025, 2025
Short summary
Philipp Breul, Paulo Ceppi, and Peer Nowack
Philipp Breul, Paulo Ceppi, and Peer Nowack

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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
We explore how Pacific low-level clouds influence projections of regional climate change by adjusting a climate model to enhance low cloud response to surface temperatures. We find significant changes in projected warming patterns and circulation changes, under increased CO2 conditions. Our findings are supported by similar relationships across state-of-the-art climate models. These results highlight the importance of accurately representing clouds for predicting regional climate change impacts.
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