Preprints
https://doi.org/10.5194/egusphere-2025-710
https://doi.org/10.5194/egusphere-2025-710
15 Apr 2025
 | 15 Apr 2025

Linear Meta-Model optimization for regional climate models (LiMMo version 1.0)

Sergei Petrov, Andreas Will, and Beate Geyer

Abstract. A new tool for objective parameter tuning of regional climate models is presented. The climate model output was emulated using a linear regression approach for each grid point on a monthly mean basis (Linear Meta-Model – LiMMo). This linear approximation showed high accuracy over a 6-year period. The error norm between the Meta-Model and the observational data sets was minimized using the gradient-based, limited-memory Broyden-Fletcher-Goldfarb-Shanno method with box constraints. The LiMMo framework was applied to the state-of-the-art regional climate model ICON-CLM, tuned to the E-OBS and HOAPS observational data sets. Different optimization objectives were explored by assigning varying weights to model variables in the error norm definition. The combination of a linear emulator with fast gradient-based optimization allows the proposed method to scale linearly with the number of model variables and parameters, facilitating the tuning of dozens of parameters simultaneously.

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Journal article(s) based on this preprint

22 Sep 2025
Linear Meta-Model optimization for regional climate models (LiMMo version 1.0)
Sergei Petrov, Andreas Will, and Beate Geyer
Geosci. Model Dev., 18, 6177–6194, https://doi.org/10.5194/gmd-18-6177-2025,https://doi.org/10.5194/gmd-18-6177-2025, 2025
Short summary
Sergei Petrov, Andreas Will, and Beate Geyer

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-710', Anonymous Referee #1, 12 May 2025
    • AC1: 'Reply on RC1', Sergei Petrov, 09 Jul 2025
  • RC2: 'Comment on egusphere-2025-710', Anonymous Referee #2, 28 May 2025
    • AC2: 'Reply on RC2', Sergei Petrov, 09 Jul 2025

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-710', Anonymous Referee #1, 12 May 2025
    • AC1: 'Reply on RC1', Sergei Petrov, 09 Jul 2025
  • RC2: 'Comment on egusphere-2025-710', Anonymous Referee #2, 28 May 2025
    • AC2: 'Reply on RC2', Sergei Petrov, 09 Jul 2025

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Sergei Petrov on behalf of the Authors (09 Jul 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (14 Jul 2025) by Emmanouil Flaounas
RR by Anonymous Referee #2 (15 Jul 2025)
RR by Anonymous Referee #1 (26 Jul 2025)
ED: Publish subject to minor revisions (review by editor) (04 Aug 2025) by Emmanouil Flaounas
AR by Sergei Petrov on behalf of the Authors (05 Aug 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (06 Aug 2025) by Emmanouil Flaounas
AR by Sergei Petrov on behalf of the Authors (06 Aug 2025)  Manuscript 

Journal article(s) based on this preprint

22 Sep 2025
Linear Meta-Model optimization for regional climate models (LiMMo version 1.0)
Sergei Petrov, Andreas Will, and Beate Geyer
Geosci. Model Dev., 18, 6177–6194, https://doi.org/10.5194/gmd-18-6177-2025,https://doi.org/10.5194/gmd-18-6177-2025, 2025
Short summary
Sergei Petrov, Andreas Will, and Beate Geyer
Sergei Petrov, Andreas Will, and Beate Geyer

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Short summary
This study introduces a new method that helps improve the accuracy of climate models by automatically selecting the best parameters to match real-world observations. Instead of manually adjusting many parameters, the method uses a mathematical tool to find the most appropriate settings for the model. It can be especially helpful for researchers who introduce new physical parameters into climate models to assess their impact on model results and optimize them along with the old ones.
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