Submitted as: development and technical paper 19 Feb 2021

Submitted as: development and technical paper | 19 Feb 2021

Review status: this preprint is currently under review for the journal GMD.

COSMO-CLM Regional Climate Simulations in the CORDEX framework: a review

Silje Lund Sørland1,a, Roman Brogli1, Praveen Kumar Pothapakula2, Emmanuele Russo3, Jonas Van de Walle4, Bodo Ahrens2, Ivonne Anders5,6, Edoardo Bucchignani7,8, Edouard L. Davin1, Marie-Estelle Demory1, Alessandro Dosio9, Hendrik Feldmann10, Barbara Früh11, Beate Geyer12, Klaus Keuler13, Donghyun Lee14, Delei Li15, Nicole P. M. van Lipzig4, Seung-Ki Min14, Hans-Jürgen Paniz10, Burkhardt Rockel12, Christoph Schär1, Christian Steger11, and Wim Thiery16 Silje Lund Sørland et al.
  • 1Institute for Atmospheric and Climate Science, ETH Zurich, Switzerland
  • 2Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt am Main, Germany
  • 3Climate and Environmental Physics, University of Bern, Switzerland
  • 4Department of Earth and Environmental Sciences, KU Leuven, Belgium
  • 5Deutsches Klimarechenzentrum, Germany
  • 6Central Institute for Meteorology and Geodynamics (ZAMG), Vienna, Austria
  • 7Centro Italiano Ricerche Aerospaziali (CIRA), Capua, Italy
  • 8Centro Euro-Mediterraneo sui Cambiamenti Climatici (CMCC) Caserta, Italy
  • 9European Commission Joint Research Centre (JRC), Ispra, Italy
  • 10Institute for Meteorology and Climate Research (IMK-TRO), Karlsruhe Institute of Technology (KIT), Germany
  • 11Deutscher Wetterdienst (DWD), 63067 Offenbach, Germany
  • 12Helmholtz-Zentrum Geesthacht, Germany
  • 13Chair of Atmospheric Processes, Brandenburg University of Technology (BTU) Cottbus - Senftenberg, Germany
  • 14Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), South Korea
  • 15CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
  • 16Department of Hydrology and Hydraulic Engineering, Vrije Universiteit Brussel, Belgium
  • acurrent affiliation: NORCE Norwegian Research Centre, Bergen, Norway

Abstract. In the last decade, the Climate Limited-area Modeling (CLM) Community has contributed to the Coordinated Re- gional Climate Downscaling Experiment (CORDEX) with an extensive set of regional climate simulations. Using several versions of the COSMO-CLM community model, ERA-Interim reanalysis and eight Global Climate Models from phase 5 of the Coupled Model Intercomparison Project (CMIP5) were dynamically downscaled with horizontal grid spacings of 0.44° (∼50 km), 0.22° (∼25 km) and 0.11° (∼12 km) over the CORDEX domains Europe, South Asia, East Asia, Australasia and Africa. This major effort resulted in 80 regional climate simulations publicly available through the Earth System Grid Fed- eration (ESGF) web portals for use in impact studies and climate scenario assessments. Here we review the production of these simulations and assess their results in terms of mean near-surface temperature and precipitation to aid the future design of the COSMO-CLM model simulations. It is found that a domain-specific parameter tuning is beneficial, while increasing horizontal model resolution (from 50 to 25 or 12 km grid spacing) alone does not always improve the performance of the simulation. Moreover, the COSMO-CLM performance depends on the driving data. This is generally more important than the dependence on horizontal resolution, model version and configuration. Our results emphasize the importance of performing regional climate projections in a coordinated way, where guidance from both the global (GCM) and regional (RCM) climate modelling communities is needed to increase the reliability of the GCM-RCM modelling chain.

Silje Lund Sørland et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on gmd-2020-443', Jan-Peter Schulz, 03 Mar 2021
  • RC1: 'Comment on gmd-2020-443', Anonymous Referee #1, 06 Apr 2021
  • RC2: 'Comment on gmd-2020-443', Anonymous Referee #2, 16 May 2021

Silje Lund Sørland et al.

Silje Lund Sørland et al.


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Short summary
We review the contribution from the CLM-Community to regional climate projections following the CORDEX framework over Europe, South Asia, East Asia, Australasia and Africa. How the model configuration, horizontal and vertical resolution and choice of driving data is influencing the model performance for the five domains is assessed, with the purpose to aid the planning and design of regional climate simulations in the future.