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Climate Variability and predictability

CLImate Variability and PRedictability: from Ocean to Continental impacts: CLIPROC


General context

The ratification of the 2015 Paris Agreement engages countries and civil society in attenuation (i.e. actions to rapidly limit the emission of greenhouse gazes) but also adaptation strategies (i.e. actions to limit the impact of present and forthcoming changes). In the latter context, it is important for a broad range of stakeholders and decision makers to know how the mix of the response to anthropogenic forcing and the impact of internal variability will shape the near term evolution of climate, especially at regional scale. This goal remains very challenging and in spite of decades of study and extensive progress in climate system modeling and observations, significant obstacles in applying this knowledge to actionable predictions remain.



To achieve reliable regional climate forecasts/projections, it is essential to reduce model biases, to better understand the physical processes at the origin of the variability, to adequately account for its internal component and assess its level of predictability as climate (mean background state, worldwide teleconnection, extremes) is changing due to human activities. The interdisciplinary endeavor to characterize, understand, attribute, simulate, and predict the slow, seasonal-to-multiannual variations of climate on global and regional scales is the backbone of the activities carried out within the CLImate Variability and PRedictability: from Ocean to Continental impacts (CLIPROC) research theme at Cerfacs.




Research areas

The CECI has a mainstay tradition to carry out theoretical and applied research on climate variations and related impacts, on a broad range of temporal and spatial scales. Research of CLIPROC focuses on different questions, including:

  • Decadal variability & predictability
  • Detection and attribution
  • Climate change and Impacts
  • Predicting sea ice variability and changes and their impact on the climate system
  • Air-sea interaction and climate model biases

Research ecosystem

Work within the CLIPROC theme requires strong interactions with the Coupling, Exascale and AI/Data Science, UQ, Data assimilation strategic axes at Cerfacs, and with external partners. The Climate theme at CECI has strong interactions with the CNRM, notably through the official climate modeling group CNRM-CERFACS, that actively worked during the 2014-2019 period on the development of CNRM-CM6 and CNRM-ESM2 suite of models for the Coupled Model Intercomparison Project Phase 6. The Climate theme has also strong collaborations with other laboratories in Toulouse such as Mercator, LEGOS, and CNES.




NextSim General Assembly and TC meeting

CERFACS |  16 September 2021

The General Assembly and TC Meeting took place on 15-16 September 2021. CERFACS is involved in the NextSim project (). The primary objective is to increase the capabilities of Computational Fluid Dynamics tools on extreme-scale parallel computing platforms for aeronautical design. This project has received funding from the European High-Performance Computing Joint Undertaking (JU) under grant agreement N° 956104. The JU receives support from the European Union’s Horizon 2020 research and innovation programme and Spain, France, Germany. This project has received funding from the Agence Nationale de la Recherche (ANR) under grant agreement N° ANR-20-EHPC-0002-02. For more information, please visit Read more

Sophie Valcke from Cerfacs co-authored a new book on atmosphere-ocean modelling

CERFACS |  18 August 2021

new book "Atmosphere-Ocean Modelling - Couling and Couplers” by Prof. Carlos R Mechoso, Prof. Soon-Il An and Dr Sophie Valcke has just been published by World Scientific. The present book fills a void in the current literature by presenting a basic and yet rigorous treatment of how the models of the atmosphere and the ocean are put together into a coupled system. Details are available at  Abstract: Coupled atmosphere-ocean models are at the core of numerical climate models. There is an extraordinarily broad class of coupled atmosphere-ocean models ranging from sets of equations that can be solved analytically to highly detailed representations of Nature requiring the most advanced computers for execution. The models are applied to subjects including the conceptual understanding of Earth’s climate, predictions that support human activities in a variable climate, and projections aimed to prepare society for climate change. The present book fills a void in the current literature by presenting a basic and yet rigorous treatment of how the models of the atmosphere and the ocean are put together into a coupled system. The text of the book is divided into chapters organized according to complexity of the components that are coupled. Two full chapters are dedicated to current efforts on the development of generalist couplers and coupling methodologies all over the worldRead more