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animation:seminaires:2017:accueil [2017/03/10 10:12] cicaluga [STRUCTURE, CHEMICAL ORDER AND REACTIVITY OF GOLD-PALLADIUM NANOPARTICLES: FROM VACUUM TO REACTION CONDITIONS] |
animation:seminaires:2017:accueil [2017/05/09 14:28] cicaluga |
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| ====== Séminaires/Colloquium 2017 ====== | ====== Séminaires/Colloquium 2017 ====== | ||
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| + | ===== Dynamics of eddy-driven jets and macroturbulent scales in the atmosphere ===== | ||
| + | {{:cbp_ens.jpeg?nolink&200 |}}**15 mai 2017 de 11h00 à 12h00** \\ | ||
| + | COLLOQUIUM Centre Blaise Pascal-Laboratoire de Physique \\ | ||
| + | Grande salle du CBP (LR6 C 023), ENS Lyon, France \\ | ||
| + | |||
| + | **Yohai KASPI **, Weizmann Institute | ||
| + | \\ | ||
| + | |||
| + | Organisateurs : \\ | ||
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| + | * Antoine Venaille (Laboratoire de Physique, ENS de Lyon) \\ | ||
| + | * Cerasela Calugaru (Centre Blaise Pascal, ENS de Lyon, France) \\ | ||
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| + | |||
| + | **Abstract :** \\ | ||
| + | We study the dynamics of eddy-driven jets using a high-resolution idealized atmospheric general circulation model (GCM), where we systematically vary Earth’s rotation rate, and thus allow a clear separation between the subtropical and eddy-driven jets. We find that due to asymmetries in baroclinicity across the jet, eddy-driven jets tend to migrate poleward. Furthermore, the migrating jets allow a latitude-by-latitude analysis of the macroturbulent scales controlling the jets. We find that over a wide range of eddy scales and latitudes the jet width scales with the Rhines scale. This is analyzed through partitioning of the barotropic energy spectrum to the role of eddy-mean and eddy-eddy interactions, in transferring energy up- and down-scale. We find that this can explain the observed energy spectrum in the atmosphere. Finally, the role of eddy-eddy interactions is analyzed through comparison to simulations where they are omitted. | ||
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| ===== Computational photochemistry of complex molecular systems ===== | ===== Computational photochemistry of complex molecular systems ===== | ||