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Temperature inversions in the boundary layer over Prague
Stryhal, Jan ; Sládek, Ivan (advisor) ; Huth, Radan (referee)
Temperature inversions in the boundary layer over Prague Abstract The main objective of this study is to analyze temperature inversions in the atmospheric boundary layer (ABL) over Prague. In the first part, the concept of the ABL is defined and main theoretical aspects of air stratification are explored. The main part of the background research summarizes current knowledge of temperature inversions, especially how the landscape pattern influences their development and parameters under different synoptic situations, and methods used for their detection, measurement and evaluation. Considering the theme of the thesis, main geographic factors influencing temperature inversions in the area of Prague are also defined. The focus of actions is placed on inversions analysis based upon time series of Praha-Libuš rawinsonde station. Homogeneity of used data is tested and all inversions within the 2000- meters-thick-layer close to the ground are derived. Diurnal, annual and interannual frequency variations are described. Significance of long-term trends is tested and trends are compared to data from Prostějov and Kümmersbruck stations. Keywords: temperature inversions, boundary layer, climate, Prague
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Habitat requirements of two species Huperzia selago and Lycopodium annotinum in sandstone area of NP Bohemian Switzerland
Trachtová, Pavla ; Hadincová, Věroslava (advisor) ; Adámek, Martin (referee)
Species Huperzia selago and Lycopodium annotinum occur in cold and humid habitats with acid substrate. These are mainly mountain areas in the Czech Republic, but also sand gorges, where the temperature inversion is common. The temperature inversion causes the fact, that temperature conditions in ravines are different from the climatic conditions of surroundings, which causes high rate of species variety among the habitats. In these places, Montane and Boreal species grow in low altitudes and in the proximity of thermophile species. The presence of montane and boreal species in sand ravines is largely influenced by inherence of temperature inversion, which is determined by features of ravine (depth, breadth, orientation) and by weather conditions. Other important agents (excepting microclimatic conditions), which influence the prevalence of these kinds, are microelement availability and the rate of competition. In Czech Republic, both species Huperzia selago and Lycopodium annotinum fall into C3 category, which means that they indicate permanent regression in our nature. In the case of my field survey in the area of the Bohemian Switzerland National Park I confirmed this tendency for species Huperzia selago.
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Hodnocení metod geomorfometrické analýzy digitálních modelů terénu pro identifikaci teplotních inverzí v prostředí GIS
Balková, Marie
This bachelor thesis deals with description of temperature inversions, compari-sons of some calculation methods and their forecats in different GIS aplications. These methods are applied to digital terrain model of selected area and subsequently evaluated in terms of their reciprocal conformity, difficulty of calculation and suitability for several data source of altimery. Afterwards their comparison with terrain measurements of temparature on various profiles of supposed inversion valley is performed. Based on regression analysis the most suitable method with the greatest dependence and also success of predisction of inverse position is determined. Output of the thesis is a topoclimatic map.
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