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• W3134955773 abstract "The role of deep convection in the intensification of Mediterranean tropical-like cyclones is examined in this thesis. While most of the Mediterranean cyclones present a common baroclinic life cycle where cyclogenesis is mainly triggered by upper tropospheric systems, the role of deep convection on cyclones development has only been addressed by few studies in the recent past. In order to investigate the contribution of deep convection in the intensification of 9 Mediterranean tropical-like cyclones between 2005 and 2018, the emphasis has been put on the Central and Eastern Mediterranean basin where these cyclones have received less attention than those in the Western Mediterranean.In a first part, the relation of deep convection with cyclones formation and intensification is investigated using remote sensing techniques, through a multi-satellite approach, with observations in the infrared and microwave spectrum. Observations derived from the Advanced Microwave Sounding Unit (AMSU-B) and the Microwave Humidity Sounder (MHS) on several operational satellites (NOAA16 through NOAA19); MetOpA/B, as well as the Spinning Enhanced Visible and Infrared Imager (SEVIRI) onboard the geostationary satellites Meteosat-8 to 11 have been used. The humidity sounding channels around 183 GHz from the AMSU/MHS sensors and a method of infrared channel differencing from SEVIRI were used to detect deep convection during the Mediterranean tropical-like cyclones. Moreover, vertical wind shear and vortex tilt were calculated by ERA5 reanalysis data to study the cyclone structure evolution. Results provide new insights about the relations between deep convection and cyclone evolution, with only a fraction of the studied cyclones experiencing intense convective activity close to their centres and persistent deep convection in the upshear quadrants leads to intensification periods. Convective activity solely in the downshear quadrants is not linked to intensification periods, while short-lived hurricane-like structures develop only during symmetric convective activity, leading to cyclone intensification in some of the cases. For this reason, the Mediterranean tropical-like cyclones have been divided into 3 groups based on distinct differences during their lifetime.As a second step, to address the impact of fine-scale thermodynamics related to deep convection and explain the observed convective activity, atmospheric modeling is employed, using the Weather Research and Forecast model (WRF) with a fine spatial resolution (3 km). The numerical simulations are forced by ERA5 reanalysis data with a high temporal resolution. To account for the effects of latent heat release during deep convection, online potential vorticity (PV) tracers are used at every model time step. In addition, a modified version of the classical pressure tendency equation (PTE) is used to post-process the numerical results to study the atmospheric dynamics related to 6 Mediterranean tropical-like cyclones. Results show that cyclone intensity changes are only partly explained by deep convection activity, with an emphasis given on the diabatically-induced low-level PV fields and diabatic heating. The baroclinic environment into which these cyclones develop has very few similarities with tropical cyclones. The numerical findings partially support our hypothesis in the observational study that the Mediterranean tropical-like cyclones may be part of a continuous spectrum of Mediterranean cyclones, but they are also distinct differences among them, namely the contribution of diabatic and baroclinic processes at their developing and mature stages." @default.
• W3134955773 created "2021-03-15" @default.
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• W3134955773 date "2020-12-14" @default.
• W3134955773 modified "2023-09-27" @default.
• W3134955773 title "Contribution of deep convection on the intensification of Mediterranean cyclones" @default.
• W3134955773 hasPublicationYear "2020" @default.
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