4.7 Article

AWI-CM3 coupled climate model: description and evaluation experiments for a prototype post-CMIP6 model

Journal

GEOSCIENTIFIC MODEL DEVELOPMENT
Volume 15, Issue 16, Pages 6399-6427

Publisher

COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/gmd-15-6399-2022

Keywords

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Funding

  1. Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [274762653]
  2. Gauss Centre for Supercomputing e.V. (GCS)
  3. Federal Ministry of Education and Research of Germany [01LN1701A]
  4. Federal Ministry of Education and Research of Germany (BMBF) [01LP2004A]
  5. Ministry of Science and Higher Education of Russia [FMWE-2021-0014]
  6. ROADMAP project from JPI Oceans (Joint Programming Initiative Healthy and Productive Seas and Oceans)
  7. JPI Climate (Connecting Climate Knowledge for Europe) [01LP2002C]

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In this paper, a new version of the AWI-CM3 model is introduced, which exhibits higher scientific skills and computational efficiency compared to its predecessors. The model incorporates the multi-resolution functionality of unstructured-mesh models while maintaining scalability and efficiency. Evaluation of the model's performance demonstrates its competitiveness and above-average representation of climatology at given resolutions.
We developed a new version of the Alfred Wegener Institute Climate Model (AWI-CM3), which has higher skills in representing the observed climatology and better computational efficiency than its predecessors. Its ocean component FESOM2 (Finite-volumE Sea ice-Ocean Model) has the multi-resolution functionality typical of unstructured-mesh models while still featuring a scalability and efficiency similar to regular-grid models. The atmospheric component OpenIFS (CY43R3) enables the use of the latest developments in the numerical-weather-prediction community in climate sciences. In this paper we describe the coupling of the model components and evaluate the model performance on a variable-resolution (25-125 km) ocean mesh and a 61 km atmosphere grid, which serves as a reference and starting point for other ongoing research activities with AWI-CM3. This includes the exploration of high and variable resolution and the development of a full Earth system model as well as the creation of a new sea ice prediction system. At this early development stage and with the given coarse to medium resolutions, the model already features above-CMIP6-average skills (where CMIP6 denotes Coupled Model Intercomparison Project phase 6) in representing the climatology and competitive model throughput. Finally we identify remaining biases and suggest further improvements to be made to the model.

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