Analyse des vents dans la stratosphère à l’aide des trajectoires des ballons et estimations des biais dans les réanalyses ERA-Interim

Abstract : In a current context focused on the ozone layer recovery and on the global warming, understand, represent and model the stratospheric dynamic became major issues. Realism of these models needs to be assessed. Unfortunately the stratosphere is an atmospheric layer hardly accessible to measurements. Balloons trajectories are mainly depending on the air masses displacements. Extract measurements from balloon trajectories is a solution. These works led to the creation of a database which contains winds, temperature and pressure measurements from stratospheric balloons flights data collected over a time period of more 20 years at several locations (arctic polar region, at mid-latitude and in tropics) and at different seasons. A methodology of winds biases analysis has been developed and has been applied to the ERA-Interim reanalysis data. By comparing our results with a previous study, we have been able to validate the database and the winds biases analyse methodology. A systematic analyse of winds biases at high altitude in the stratosphere considering several locations/seasons has been implemented. The results show the biases in ERA-Interim reanalyses vary and rise as function of the altitude. The locations which are associated to well established circulations are rather well represented while the locations where the variability is higher present more difficulty. Globally biases results report ERA-Interim reanalyses underestimate wind speed in the stratosphere.
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Fabrice Duruisseau. Analyse des vents dans la stratosphère à l’aide des trajectoires des ballons et estimations des biais dans les réanalyses ERA-Interim. Sciences de la Terre. Université d'Orléans, 2014. Français. ⟨NNT : 2014ORLE2043⟩. ⟨tel-01145270⟩

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