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Accueil du site > Évènements > Séminaires > Séminaires IRPHE > Archives IRPHE > 2021

Vendredi 15 Janvier 2021/ IRPHE

publié le

Séminaire IRPHE (visio)

Abrupt transitions for turbulent atmospheres and climate dynamics

Orateur : Freddy Bouchet / ENS Lyon

Abstract :
In the past, the Earth and Jupiter atmospheres have experienced fast and drastic transitions, sometimes associated with abrupt climate changes. Some of these changes of turbulent attractors were not caused by external perturbations, but the result of internal variability. Studying such abrupt transitions, for fully turbulent atmosphere dynamics, requires new numerical and theoretical tools.

I will present two examples of recent works and new approaches developed in order to study abrupt transitions. First, for Earth like atmospheres, I will discuss the conditions for abrupt transitions to climates with superrotating equatorial jets. I will explain the fluid mechanics phenomena and parameters that determine whether such transitions are discontinuous or continuous. And second, I will explain the use of rare event algorithms and large deviation theory to study abrupt changes in Jupiter atmosphere, in the turbulent dynamics of either barotropic or two-layer models.

Date et lieu  : le vendredi 15 janvier à 11h00 (visio)

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