Search results for "circulation atmosphérique"
showing 5 items of 5 documents
Températures extrêmes minimales de printemps et types de circulation atmosphérique sur l’Europe moyenne.
2019
55 pages; National audience
Variabilité climatique printanière et phénologie végétale en Auxois : exemple d'Alise-Sainte-Reine (Côte d'Or).
2018
Un suivi photographique est effectué depuis 2011 sur le site viticole d'Alise-Sainte-Reine, dans l'Auxois en Bourgogne du Nord (département de la Côte-d'Or), afin de mettre en évidence des indicateurs permettant d'expliquer la variabilité interannuelle des stades phénologiques de certaines espèces végétales par l'analyse de la variabilité climatique et de la fréquence, succession et durée des types de circulation atmosphérique et de temps. Les photos prises au début du mois de mai montrent une différence sensible entre d'une part les années 2011 et 2018, et d'autre part les années 2016 et 2017. Sur la vigne de la parcelle sélectionnée et les arbres environnants, le déploiement des feuilles …
Pluviométrie et circulation atmosphérique simulées par le modèle régional WRF en Afrique australe : sensibilité à la physique et variabilité interne
2011
This study evaluates the capability of the regional climate model WRF to simulate Southern African rainfall and associated atmospheric circulation, particularly over South Africa, a country covered by a dense network of in situ observations. Three sets of simulations are performed at a 35km horizontal resolution during the core of the austral rainy season (December to February: DJF) with 6-hourly forcings provided by ERA40 reanalysis. The first set quantifies sensitivity of the simulated climate to the parameterizations of atmospheric convection, planetary boundary layer and microphysics. The retained case study (DJF 1993-1994: DJF94) is representative of the South African rainfall climatol…
Heat in Normandy, types of atmospheric circulation and climate change (1970 - 2019)
2020
Heat in Normandy, synoptic circulation patterns and climate change (1970-2019). This article focuses on the role and the evolution of the different kinds of synoptic circulation patterns in the occurrence of hot days in Normandy. Heat is here, very dependent on the presence of action centres over central Europe as well as, air flow coming from NE and E. Contemporary climate change expresses itself by a rise in thermal efficiency of all synoptic circulation patterns (more heat for the same flow). Lastly, the north of Cotentin stands out by being a real “cool island” during summer because of its peninsula position which imposes on any air mass, regardless of its origin, a cooling from its bot…
Dynamique spatio-temporelle d’un événement extrême froid : impact de la circulation atmosphérique sur les basses températures en Bourgogne viticole.
2020
During April 2019 France experienced several frost events that caused extensive damage to almost all of its winegrowing regions. In Bourgogne-Franche-Comté the frost effects were very punctual and spatially diffused, the greatest damage being observed in the early bud breaking winegrowing sub-regions of Saône-et-Loire and the south of the Côte de Beaune. This study focuses on the multi-scalar analysis of the spring frost event underwent during the night between the 4th and 5th of April on a vineyard plot located in the Hautes Côtes de Beaune appellation. The analysis highlights the impact of local parameters (topography, surface discontinuity, etc.) on the spatio-temporal structuring of tem…