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The 29 June 2016 at 10h00

HDR Defense : Emilia SANCHEZ-GOMEZ – Understanding climate variability and predictability from observations, reanalysis and imperfect models



In these 14 years as a climate researcher, a great part of my activity has been focused on the study of the North Atlantic-Europe climate variability and predictability from interannual to decadal timescales. The key objective is to understand the internal climate variability and how it can be modified in response to external forcings, as the anthropogenic emissions. In the North Atlantic, the large-scale atmospheric circulation, described in terms of weather regimes, can explain a great part of the local climate variability, since it modulates the temperature, precipitation and the storm-tracks intensity and pathways. I show here that weather regimes also allow the understanding of remote climate processes as tropical-extratropical teleconnections. Nevertheless in the midlatitudes areas climate signals are not easily detectable due to a large presence of chaotic variability.

A large body of my research has been also oriented to the evaluation of climate models (regional and global). Understanding the source of errors is crucial since most of our science relies on numerical modeling. I present a hierarchy of diagnostics, from an apparently simple analysis of the mean state bias, to the representation of the climate variability and more sophisticated process-based studies as the analysis of bias adjustment in seasonal and decadal forecasts.

Finally, I propose several perspectives aimed at i) improving our understanding of climate processes involving air-sea interactions and their influence of the large-scale atmospheric circulation over the midlatitude regions, and ii) reducing the uncertainty from climate models by proposing some alternatives to improve them.


Prof. Olivier THUAL Correspondant
Prof. Francisco DOBLAS-REYES Rapporteur
Dr. Boris DEWITTE Rapporteur
Dr. Laurent Li Rapporteur
Prof. Noel Keenlyside Examinateur
Prof. Belen Rodriguez-Fonseca Examinateur


CECI Contribution to CNRS’ “Petit Illustré” on Complex Systems (CNRS Edition)

ROGEL |  12 October 2017

CECI (Cerfacs, CNRS) and IMFT are both working on numerical modelling of the processes causing river flooding and their uncertainties. A common contribution on this subject, signed by Sophie Ricci and Hélène Roux, appears in Vol. 34 of the "Petit Illustré" collection, edited by CNRS.Read more

CERFACS was present at the European Researcher Night 2017 at Toulouse

thual |  1 October 2017

"Can we get an engine, an airplane or the entire Earth into a computer?". Such was the catchy title of the CERFACS stand  Friday September 29th, for the "European Research Night" whose theme was "Impossible". A hundred people at the "Quai des Savoirs" in Toulouse took a close interest in the...Read more