Preprints
https://doi.org/10.5194/egusphere-2024-2682
https://doi.org/10.5194/egusphere-2024-2682
22 Oct 2024
 | 22 Oct 2024

Implementation and validation of a supermodelling framework into CESM version 2.1.5

William Eric Chapman, Francine Schevenhoven, Judith Berner, Noel Keenlyside, Ingo Bethke, Ping-Gin Chiu, Alok Gupta, and Jesse Nusbaumer

Abstract. Here we present a framework for the first atmosphere-connected supermodel using state-of-the-art atmospheric models. The Community Atmosphere Model (CAM) versions 5 and 6 exchange information interactively while running, a process known as supermodeling. The primary goal of this approach is to synchronize the models, allowing them to compensate for each other's systematic errors in real-time, in part by increasing the dimentionality of the system.

In this study, we examine a single untrained supermodel where each model version is equally weighted in creating pseudo-observations. We demonstrate that the models synchronize well without decreased variability, particularly in storm track regions, across multiple timescales and for variables where no information has been exchanged. Synchronization is less pronounced in the tropics, and in regions of lesser synchronization we observe a decrease in high-frequency variability. Additionally, the low-frequency modes of variability (North Atlantic Oscillation and Pacific North American Pattern) are not degraded compared to the base models. For some variables, the mean bias is reduced compared to control simulations of each model version as well as the non-interactive ensemble mean.

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Journal article(s) based on this preprint

01 Sep 2025
Implementation and validation of a supermodeling framework into Community Earth System Model version 2.1.5
William E. Chapman, Francine Schevenhoven, Judith Berner, Noel Keenlyside, Ingo Bethke, Ping-Gin Chiu, Alok Gupta, and Jesse Nusbaumer
Geosci. Model Dev., 18, 5451–5465, https://doi.org/10.5194/gmd-18-5451-2025,https://doi.org/10.5194/gmd-18-5451-2025, 2025
Short summary
William Eric Chapman, Francine Schevenhoven, Judith Berner, Noel Keenlyside, Ingo Bethke, Ping-Gin Chiu, Alok Gupta, and Jesse Nusbaumer

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-2682', Anonymous Referee #1, 22 Nov 2024
  • CC1: 'Comment on egusphere-2024-2682', Gregory Duane, 29 Nov 2024
    • AC3: 'Reply on CC1', Will Chapman, 11 Mar 2025
  • RC2: 'Comment on egusphere-2024-2682', Anonymous Referee #2, 13 Jan 2025
  • AC1: 'Comment on egusphere-2024-2682', Will Chapman, 11 Mar 2025
  • AC2: 'Comment on egusphere-2024-2682 - response to RC2', Will Chapman, 11 Mar 2025

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-2682', Anonymous Referee #1, 22 Nov 2024
  • CC1: 'Comment on egusphere-2024-2682', Gregory Duane, 29 Nov 2024
    • AC3: 'Reply on CC1', Will Chapman, 11 Mar 2025
  • RC2: 'Comment on egusphere-2024-2682', Anonymous Referee #2, 13 Jan 2025
  • AC1: 'Comment on egusphere-2024-2682', Will Chapman, 11 Mar 2025
  • AC2: 'Comment on egusphere-2024-2682 - response to RC2', Will Chapman, 11 Mar 2025

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Will Chapman on behalf of the Authors (17 Mar 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Publish subject to minor revisions (review by editor) (16 Apr 2025) by Sophie Valcke
AR by Will Chapman on behalf of the Authors (05 May 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Publish subject to technical corrections (22 May 2025) by Sophie Valcke
AR by Will Chapman on behalf of the Authors (27 May 2025)  Manuscript 

Journal article(s) based on this preprint

01 Sep 2025
Implementation and validation of a supermodeling framework into Community Earth System Model version 2.1.5
William E. Chapman, Francine Schevenhoven, Judith Berner, Noel Keenlyside, Ingo Bethke, Ping-Gin Chiu, Alok Gupta, and Jesse Nusbaumer
Geosci. Model Dev., 18, 5451–5465, https://doi.org/10.5194/gmd-18-5451-2025,https://doi.org/10.5194/gmd-18-5451-2025, 2025
Short summary
William Eric Chapman, Francine Schevenhoven, Judith Berner, Noel Keenlyside, Ingo Bethke, Ping-Gin Chiu, Alok Gupta, and Jesse Nusbaumer
William Eric Chapman, Francine Schevenhoven, Judith Berner, Noel Keenlyside, Ingo Bethke, Ping-Gin Chiu, Alok Gupta, and Jesse Nusbaumer

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Short summary
We introduce the first state-of-the-art atmosphere-connected supermodel, where two advanced atmospheric models share information in real-time to form a new dynamical system. By synchronizing the models, particularly in storm track regions, we achieve better predictions without losing variability. This approach maintains key climate patterns and reduces bias in some variables compared to traditional models, demonstrating a useful technique for improving atmospheric simulations.
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