Articles | Volume 15, issue 22
https://doi.org/10.5194/gmd-15-8245-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-15-8245-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Model evaluation paper
| 
17 Nov 2022
Model evaluation paper |
| 17 Nov 2022
| 17 Nov 2022
Impact of increased resolution on the representation of the Canary upwelling system in climate models
Adama Sylla
CORRESPONDING AUTHOR
CECI, CNRS, CERFACS, Université de Toulouse, Toulouse, France
Laboratoire de Physique de l'Atmosphère et de l'Ocean Simeon Fongang (LPAO-SF/ESP/UCAD), Dakar, Senegal
Emilia Sanchez Gomez
CECI, CNRS, CERFACS, Université de Toulouse, Toulouse, France
Juliette Mignot
CNRS/IRD/MNHN, LOCEAN Laboratory, Sorbonne University, Paris, France
Jorge López-Parages
CECI, CNRS, CERFACS, Université de Toulouse, Toulouse, France
Physical Oceanography Group, University of Málaga, Spain
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The impact of the Atlantic multidecadal variability (AMV) on the rainfall distribution and timing of the West African monsoon is not well known. Analysing model output, we find that a positive AMV enhances the number of wet days, daily rainfall intensity, and extremes over the Sahel and tends to prolong the monsoon length through later demise. Heavy rainfall events increase all over the Sahel, while moderate ones only occur in the north. Model biases affect the skill in simulating AMV impact.
Yona Silvy, Clément Rousset, Eric Guilyardi, Jean-Baptiste Sallée, Juliette Mignot, Christian Ethé, and Gurvan Madec
Geosci. Model Dev., 15, 7683–7713, https://doi.org/10.5194/gmd-15-7683-2022, https://doi.org/10.5194/gmd-15-7683-2022, 2022
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A modeling framework is introduced to understand and decompose the mechanisms causing the ocean temperature, salinity and circulation to change since the pre-industrial period and into 21st century scenarios of global warming. This framework aims to look at the response to changes in the winds and in heat and freshwater exchanges at the ocean interface in global climate models, throughout the 1850–2100 period, to unravel their individual effects on the changing physical structure of the ocean.
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Short summary
Increasing model resolution depends on the subdomain of the Canary upwelling considered. In the Iberian Peninsula, the high-resolution (HR) models do not seem to better simulate the upwelling indices, while in Morocco to the Senegalese coast, the HR models show a clear improvement. Thus 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.
Increasing model resolution depends on the subdomain of the Canary upwelling considered. In the...
