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Characteristics of convective environment in ALADIN reanalysis
Zacharov, Petr, jr. ; Vokoun, Martin
For the prediction and assessment of the potential for convective cloud formation, various characteristics of the convective environment are used. Values of CAPE, CIN, wind speed, and temperature at several standard levels are available from the ALADIN reanalysis outputs, from which wind shear and vertical temperature gradient can be calculated. Verification allows for point comparison with data from sounding measurements, for example, from Prague, Libuš.
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Validation of reanalysis for Central Europe PERUN/Reanalysis
Beranová, Romana ; Rulfová, Zuzana ; Sokol, Zbyněk
PERUN/Reanalysis is based on the ALADIN numerical forecast model, which has been adapted for climatological calculations. To serve as one of the reference sets for estimating expected climate changes in the coming decades, it needs to undergo validation against station measurements and possibly against other commonly used data sets. In this conference paper, we will examine the validation of basic meteorological quantities across the computational domain of the ALADIN model. To achieve this, we will use station data from the ECA&D database, station data in the regular network (Eobs), and the ERA5 global reanalysis. Validation will be conducted for the period from 1990 to 2014. During validation, our primary focus will be on air temperature (minimum, maximum, and mean) and precipitation. We will also examine additional variables, including wind speed.\n
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Synoptic situations in Europe
Šubík, Štěpán ; Belda, Michal (advisor) ; Kučerová, Monika (referee)
OF THE BACHELOR THESIS Štěpán Šubík Synoptic situations in Europe Department of Atmospheric Physics Supervisor of the bachelor thesis: Mgr. Michal Belda, Ph.D. Advisor of the bachelor thesis: Mgr. Michal Žák, Ph.D. Study programme: Physics Study branch: General Physics Prague 2018 Title: Synoptic situations in Europe Author: Štěpán Šubík Department: Department of Atmospheric Physics Supervisor: Mgr. Michal Belda, Ph.D., Department of Atmospheric Physics Advisor: Mgr. Michal Žák, Ph.D., Department of Atmospheric Physics Abstract: This thesis is written to describe classifications of weather types, one of the methods applicable in Central and Western Europe. The main aim is to find an objective classification, which can be used as a help and support for different weather forecast models. The thesis is divided into three parts. The first part offers an information about the most used weather type classifications and their objective definitions. In the second part is a comparison of the objective classifications and their applicability in the area of Central and West Europe. In the third part, we used the classification selected in part two, the Lamb weather types, to classify the area in years 2011-2017. A relationship between the weather types and temperature was also studied above the...
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Long-term changes of selected stratospheric fields related to circulation and enhancing greenhouse effect
Kozubek, Michal ; Laštovička, Jan (advisor)
In the present work we study behavior and trends of stratospheric wind in period of 1957-2002. We used reanalyzed daily data from project ERA-40. Results are shown in graphic form for 3 atmospheric levels. In each level we describe trends of wind velocities and directions separate into 2 seasons. We also compare trends of stratospheric wind with other characteristic indicators of atmospheric circulation. One of them is total columnar ozone and the second is mesopause midlatitude winds. Results of analyze halving adjustment of trends in wind directions and velocities for level 100, 50 and 10 hPa, too.
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Synoptic situations in Europe
Šubík, Štěpán ; Belda, Michal (advisor) ; Kučerová, Monika (referee)
OF THE BACHELOR THESIS Štěpán Šubík Synoptic situations in Europe Department of Atmospheric Physics Supervisor of the bachelor thesis: Mgr. Michal Belda, Ph.D. Advisor of the bachelor thesis: Mgr. Michal Žák, Ph.D. Study programme: Physics Study branch: General Physics Prague 2018 Title: Synoptic situations in Europe Author: Štěpán Šubík Department: Department of Atmospheric Physics Supervisor: Mgr. Michal Belda, Ph.D., Department of Atmospheric Physics Advisor: Mgr. Michal Žák, Ph.D., Department of Atmospheric Physics Abstract: This thesis is written to describe classifications of weather types, one of the methods applicable in Central and Western Europe. The main aim is to find an objective classification, which can be used as a help and support for different weather forecast models. The thesis is divided into three parts. The first part offers an information about the most used weather type classifications and their objective definitions. In the second part is a comparison of the objective classifications and their applicability in the area of Central and West Europe. In the third part, we used the classification selected in part two, the Lamb weather types, to classify the area in years 2011-2017. A relationship between the weather types and temperature was also studied above the...
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Global changes in the midlatitude stratosphere
Kozubek, Michal ; Laštovička, Jan (advisor) ; Halenka, Tomáš (referee) ; Metelka, Ladislav (referee)
Several phenomena in the middle latitude stratosphere are studied in the thesis. The reanalyses are utilized as a source of data for our study. Different reanalyses are compared each other and with observations and problems of reanalyses are shown. We are interested in connection between ozone, dynamics and other phenomena (Sudden Stratospheric Warmings, solar cycle, NAO etc.) in the stratosphere, mainly from 1979 to present using ERA-Interim, NCEP/NCAR reanalyses or satellite observations. The linear connection between total ozone difference and 100 hPa eddy heat flux is found in winter middle latitudes. Ozone trends in Europe and China are analysed. The meridional and zonal wind is also studied using MERRA reanalysis and model output (CCM SOCOL v3.0). The comparison of geographical distribution of geopotential height and meridional wind is done. Differences between MERRA and CCM SOCOL v3.0 has been observed for geopotential hight and meridional wind for winter season.
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Long-term changes of selected stratospheric fields related to circulation and enhancing greenhouse effect
Kozubek, Michal ; Laštovička, Jan (advisor)
In the present work we study behavior and trends of stratospheric wind in period of 1957-2002. We used reanalyzed daily data from project ERA-40. Results are shown in graphic form for 3 atmospheric levels. In each level we describe trends of wind velocities and directions separate into 2 seasons. We also compare trends of stratospheric wind with other characteristic indicators of atmospheric circulation. One of them is total columnar ozone and the second is mesopause midlatitude winds. Results of analyze halving adjustment of trends in wind directions and velocities for level 100, 50 and 10 hPa, too.
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