Sökning: "Abdel Hannachi"
Hittade 4 avhandlingar innehållade orden Abdel Hannachi.
1. Northern Hemispheric Cold Spells and their Tropospheric-Stratospheric Link
Sammanfattning : Cold spells have severe consequences for society. They require early warnings for elaborate mitigation strategies on sub-seasonal to seasonal time-scales. LÄS MER
2. On atmospheric low frequency variability, teleconnections and link to jet variability
Sammanfattning : The atmosphere is a complex system with an infinite number of independent variables. The best approximations of the atmosphere are made using numerical models. The use of such models provides an invaluable tool for studying the atmospheric system. LÄS MER
3. On the representation of precipitation in high-resolution regional climate models
Sammanfattning : Weather and climate models applied with sufficiently fine mesh grids to enable a large part of atmospheric deep convection to be explicitly resolved have shown a significantly improved representation of local, short-duration and intense precipitation events compared to coarser scale models. In this thesis, two studies are presented aimed at exploring the dependence of horizontal resolution and of parameterization of convection on the simulation of precipitation. LÄS MER
4. Seasonality and variability of stratospheric water vapour
Sammanfattning : Stratospheric water vapour (SWV) plays a critical role in the climate system by modulating the radiation budget and influencing the stratospheric chemistry. Studying changes of SWV on global scale is helpful for our understanding of climate change. LÄS MER