Impact of clouds parameterization on warm conveyor belts and jet-stream dynamics. A modeling and observational approach

A seminar organised by the Laboratoire de Météorologie Dynamique (LMD-IPSL) at ENS with Marie Mazoyer (Météo-France) on the impact of clouds parameterization on warm conveyor belts and jet-stream dynamics : a modeling and observational approach.


Date de début 14/02/2022 11:00
Date de fin 14/02/2022
Organisateur Hélène Rouby
Lieu Froidevaux – E314 (ENS, 24 rue Lhomond - 75005)


In midlatitudes, the jet stream structure is modulated by diabatic processes occurring in the warm conveyor belt of extratropical cyclones. This study investigates clouds processes along the warm conveyor belts of two extratropical cyclones observed during the North Atlantic Waveguide and Downstream Impact Experiment (NAWDEX). Radically different microphysical schemes are evaluated within a convection permitting model as well as distinct schemes for mixed-phase clouds representation. Comparison with data from the NAWDEX campaign helps to determine the most accurate representation.

We highlight the strong sensitivity of upper-level dynamics to ice-related and mixed-phase cloud related processes. These findings point out the need of a better understanding of these processes for an improved prediction of upper-level dynamics.

Informations supplémentaires

Date: February 14, 2022
Time: 11h
Location: Froidevaux – E314 (ENS, 24 rue Lhomond – 75005)
Seminar by Marie Mazoyer (Meteo France)