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Time variability of the vertical copmponent of wind speed and its relationship to other meteorological variables in the Czech Republic
Zeman, Šimon ; Kašpar, Marek (advisor) ; Müller, Miloslav (referee)
Title: Time variability of the vertical component of wind speed and its relationship to other meteorological variables in the Czech Republic Author: Bc. Šimon Zeman Department: Physical Geography and Geoecology Supervisor: RNDr. Marek Kašpar, Ph.D. Abstract: The large-scale vertical velocity of the horizontal scale up to thousands of kilometers has been studied in the presented study. These "centimeters" motions have a significant interest in the formation of cloud and precipitation bands in midlatitudes frontal cyclones. The formation and distribution of large-scale vertical motion in the frontal midlatitude cyclone are mentioned. For the statistical analysis, the data from the reanalysis project ECMWF ERA-40 were used for the Czech territory from 1957 - 2002. From March to July, higher frequency of ascend motions was found. In contrast, descent motions dominated. between September and January. Interannual variability of vertical velocity showed increased frequency of descent motions in the period 1972 - 1982 and increasing frequency of ascend motions between 1983 - 1988. Relationship of vertical velocity and high precipitation has a moderate correlation with exponential regression. Relationship of absolute vorticity advection and vertical velocity have a weak negative correlation. Keywords: vertical...
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Determination of flux of moisture magnitude and direction by wind and moisture characteristics
Lemarie, Petr ; Pop, Lukáš (referee) ; Müller, Miloslav (advisor)
Determination of flux of moisture magnitude and direction by wind and moisture characteristics Abstract This thesis deals with determination of moisture flux magnitude and direction by wind and moisture characteristics. A source of this thesis is the ERA-40 reanalysis, a service area is Europe and adjoining part of the Atlantic ocean. There are used data from four selected preasure levels from period since September 1957 to August 2002. A standardized share of wind speed and specific humidity is created for research of the influence of these values on specific moisture flux magnitude and a regional distribution, a vertical distribution and an annual run of the influence of values is researched on its base. The influence of wind speed on moisture flux magnitude increases with rising latitude and altitude. The influence of wind speed is also higher in winter than in summer. A difference in standardized share between winter and summer increases with rising distance from an ocean. Keywords: moisture flux, wind direction, wind speed, specific humidity, ERA-40 re-analysis, Euroatlantic area
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Circulation types and flux of moisture in the Czech Republic
Benco, Milan ; Kakos, Vilibald (referee) ; Müller, Miloslav (advisor)
The dissertation deals with the flux of moisture in atmosphere, and classification of circulation patterns written by the team of ČHMÚ in the territory of the Czech Republic. ERA - 40 re - analysis data are used for the moisture flow assessment. We examine the time period between September 1957 - August 2002. The flux of moisture is evaluated on four isobaric levels 300, 500, 700, 850hPa in grid point (coordinates 15 east longitude, 50 north latitude). The results confirm dominant West circulation in the territory of the Czech Republic. Western types synoptic situations dominate, by the extreme flux of moisture. In annual run of moisture, we can observe the late minimum and maximum onset. This is caused by the influence of Atlantic Ocean. Analysis of variance is used to prove the bilateral relationship between Classifications of circulation patterns. Powered by TCPDF (www.tcpdf.org)
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Hydrometeorological droughts in the Czech territory since 1851
Kakos, Vilibald ; Müller, Miloslav
Variously long periods of precipitation deficit were studied. In the 20th century, the most intensive drought period was first half of 30s. Nevertheless, the drought in first half of 60s of the 19th century was even stronger from the viewpoint of precipitation as well as outflow characteristics. Hydrological droughts arise generally later than precipitation deficits as was shown by comparison of both types of droughts.
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