Preprints
https://doi.org/10.5194/gmd-2022-130
https://doi.org/10.5194/gmd-2022-130
Submitted as: model evaluation paper
17 May 2022
Submitted as: model evaluation paper | 17 May 2022
Status: this preprint is currently under review for the journal GMD.

Impact of increased resolution on the representation of the Canary upwelling system in climate models

Adama Sylla1,2, Emilia Sanchez Gomez1, Juliette Mignot3, and Jorge López-Parages1,4 Adama Sylla et al.
  • 1CECI, Université de Toulouse, CNRS, CERFACS, Toulouse, France
  • 2Laboratoire de Physique de l’Atmosphère et de l’Ocean Simeon Fongang (LPAO-SF/ESP/UCAD), Dakar, Senegal
  • 3Sorbonne University (CNRS/IRD/MNHN), LOCEAN Laboratory, Paris, France
  • 4Physical Oceanography Group, University of Málaga, Spain

Abstract. We investigate the representation of the Canary upwelling system (CUS) in six global coupled climate models operating at high and standard resolution as part of the High Resolution Model Intercomparison Project (HighResMIP). For this project the resolution of the ocean and/or atmosphere components was increased. The models performance in reproducing the observed CUS is assessed in terms of various upwelling indices based on SST, wind stress and sea surface height, focussing on the effect of increasing model spatial resolution. Our analysis shows that an increase of spatial resolution depends on the sub-domain of the CUS considered. Strikingly, along the Iberian Peninsula region, which is the northernmost part of the CUS, the models show lower skill at higher resolution compared to their corresponding lower resolution version in both components for all the indices analyzed in this study. On the contrary, over the southernmost part of the CUS, from the north of Morocco to the Senegalese coast, the high ocean and atmosphere resolution models simulate a more realistic upwelling than the standard resolution models, which largely differ from the range of observational estimates. These results suggest that increasing resolution is not a sufficient condition to obtain a systematic improvement in the simulation of the upwelling phenomena as represented by the indices considered here, and other model improvements notably in terms of the physical parameterizations may also play a role.

Adama Sylla et al.

Status: open (until 30 Jul 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gmd-2022-130', Anonymous Referee #1, 28 Jun 2022 reply
  • RC2: 'Comment on gmd-2022-130', Anonymous Referee #2, 30 Jun 2022 reply
  • RC3: 'Comment on gmd-2022-130', Anonymous Referee #3, 01 Jul 2022 reply

Adama Sylla et al.

Adama Sylla et al.

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Short summary
Increasing model resolution depends on the sub-domain of the Canary upwelling considered. In the Iberian Peninsula, the HR models do not seem to better simulate the upwelling indices, while in Morocco to Senegalese coast, the HR models show a clear improvement. Therefore increasing the resolution of a global climate model does not necessarily have to be the only way to better represent the climate system. There is still much work to be done in terms of physical parameterizations.