National Repository of Grey Literature 1 records found  Search took 0.01 seconds. 
Type of the scheme and tuning dependence of the parameterized orographic gravity wave drag distribution in global climate models.
Hájková, Dominika ; Šácha, Petr (advisor) ; Gisinger, Sonja (referee)
Orographic gravity waves (OGWs) are ubiquitous in the atmosphere and they have an important influence on the dynamics and energy transport especially in the middle- atmosphere. As such, they have to be included in global climate models. Current global models have a low resolution and for that reason OGW effects have to be parameterized. This thesis focuses on the most important output of the OGW parameterizations - the resulting OGW drag. This drag is transported upwards from the surface by the wave and is distributed in the atmosphere. Parameterization schemes differ in many aspects such as the topography description, inclusion of non-linear effects, tuning of the free parameters and others. We have reviewed and described 7 different parameterizations, which are used in 9 different CMIP6 models. After comparing drag data from each of the models we find unexpectedly great differences in the vertical distribution of the drag as well as the magnitude. Focusing on 4 hotspots around the globe, we proposed hypotheses based on the knowledge of the parameterization schemes that can partially explain the inter-model differences. The thesis can pave the way for a more systematic research of the OGW parameterizations in the future, with an ultimate goal of lowering the amount of uncertainty of the future climate...

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