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791.
Eva Holtanová Jaroslava Kalvová Jiří Mikšovský Petr Pišoft Martin Motl 《Studia Geophysica et Geodaetica》2010,54(3):513-528
In this study we present results of uncertainty analysis in eight regional climate model (RCM) outputs over the area of the
Czech Republic. The RCM simulations come from the EU 5th Framework program project PRUDENCE (Prediction of Regional scenarios
and Uncertainties for Defining EuropeaN Climate change risks and Effects). Using the analysis of variance we have found that
the main source of uncertainty in projected changes of mean seasonal air temperature is the driving global climate model.
In case of precipitation changes, the RCM is the largest source of uncertainty in all seasons except for the spring. With
the second method, the Reliability Averaging method, we have focused on the uncertainty coming from the RCM itself. The results
of both methods showed that the relative contribution of the regional climate model to the uncertainty of simulated mean seasonal
air temperature and precipitation changes is largest in summer and smallest in winter. 相似文献
792.
Soejono Igor Janoušek Vojtěch Žáčková Eliška Sláma Jiří Konopásek Jiří Machek Matěj Hanžl Pavel 《International Journal of Earth Sciences》2017,106(6):2109-2129
International Journal of Earth Sciences - Cadomian magmatic complexes of the Brunovistulian Domain crop out at the eastern termination of the Bohemian Massif. However, the age, nature and... 相似文献
793.
Richard Přikryl Jiřina Přikrylová Martin Racek Zuzana Weishauptová Kateřina Kreislová 《Environmental Earth Sciences》2017,76(7):290
A carving of the indoor main altar of St. Vitus Cathedral in Prague (Czech Republic) is made of the opuka stone—a clayey–calcareous silicite—which now exhibits the development of decay phenomena such as the formation of salt-laden case-hardened subsurface layer (approx. 150 mm thick), with detachment of the case-hardened layer manifested by blistering and/or flaking. Formation of this gypsum-rich layer is linked to the reaction of components (SO2) from polluted air (both outdoor and indoor) and from the rock itself (calcium ion from calcite). Development of brittle damage in the subsurface layer and underlying stone is interpreted based on the results from previous environmental monitoring in the Cathedral’s interior, which indicated highly fluctuating temperature and humidity, resulting in a hygrothermal stress in the material described by the “double-layer sandwich” model. The sensitivity of the studied stone to the above-mentioned processes is evidenced by its microstructural properties, specifically parameters of the pore spaces which indicate an extremely high susceptibility to damage by the actions of freezing water and/or salt crystallisation. 相似文献
794.
Ulrych Jaromír Krmíček Lukáš Teschner Claudia Řanda Zdeněk Skála Roman Jonášová Šárka Fediuk Ferry Adamovič Jiří Pokorný Richard 《Mineralogy and Petrology》2017,111(5):761-775
Mineralogy and Petrology - Tachylytes from rift-related volcanic rocks were recognized as: (i) irregular veinlets in host alkaline lava flows of the Kozákov volcano, Czech Republic, (ii)... 相似文献
795.
The first results of the almost one year drop size distribution (DSD) measurement in the Czech Republic are summarised in this study. The ESA-ESTEC 2D videodistrometer was used to measure the rain drop parameters. The average DSD is shown to be of the gamma type. One minute DSDs were evaluated to test the accuracy of analytical DSD models. Parameters of gamma distribution and exponential distribution functions were evaluated for the whole data set as well as for the various rain rate intervals. Regression technique and the method of moments were applied to estimate the parameters of DSD. It is shown that the parameter value strongly depends on the method of computation as well as on the rain type. Its average value is about 0.59 for the average (smooth) one minute DSD while an average value of un-smoothed DSD is 11.0 (moment method) or 5.4 (regression technique). The Joss's shape parameter and the Tokay-Short's parameter CS estimating roughly the rain type are also discussed (if CS>1, the event should be convective). The tendency of increasing numerical value of the CS parameter with the increasing rain rate was observed (the DSDs were distributed into classes respecting the rain rate value) and thus the idea of the convectivity occurrence bounded with the higher CS parameter value was supported. The study also compares the parameters of the average DSD with the averages of parameter values of all 4 183 one minute DSDs. 相似文献
796.
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799.
The problem of the gravitational instability of an inviscid plasma cloud is investigated by taking into account radiative effects. It is shown that, on given conditions, the radiation stabilizes the system. 相似文献
800.
Vach M. J. Navrátil T. Fottová D. špičková J. Skřivan P. 《Studia Geophysica et Geodaetica》2004,48(4):791-809
An attempt to indicate the sources and pathways of selected chemical substances in precipitation over central Bohemia was accomplished with help of bulk samples, collected in a forested rural landscape approx. 30 km SE from Prague, capital of the Czech Republic. Samples have been collected monthly throughout the 1990s. They were analyzed to determine the concentration of selected major cations and anions (Na+, K+, Ca2+, Mg2+, NH4
+, SO4
2-, NO3
-, Cl-), as well as several minor and trace elements (Al, As, Be, Cd, Cu, Fe, Mn, Pb, Sr, Zn, F-).Set of the bulk samples shows strong mutual correlation of the main acidifiers - compounds of N, S (and F). Good correlation occurs also at the typical lithogenic elements Al, K, Na, Ca, Mg, Sr, and the typical elements originating from the flue gases of the combustion chambers burning low quality brown coal - As, (Be), Cd, Cu, Pb, and Zn. The only strong correlation of Cl with Na (and Mg) indicates that majority of these elements originates from the oceanic spray. The content of pollutants in precipitation depends on the air masses types and on the rout of their approach to the sampling site. The typing of synoptic situations was employed for the determination of the air masses types and routs and of the corresponding fronts and precipitation fields. 相似文献