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The use of cluster analysis to evaluation half-year measurement campaign of gaseous elemental mercury from atmospheric station Křešín u Pacova
Veselik, P. ; Dvorská, Alice
This paper deals with evaluation of gaseous elemental mercury in the air from Atmospheric Station Křešín u Pacova. The measurements were conducted with two identical instruments positioned right next to each other in one ground-based container in a 10 min time step, between December 2012 and June 2013. This measurement campaign was aggregated into approximately weekly intervals. The aim of this paper is to show the use of cluster analysis for finding those time periods which correspond the most according to appropriately selected criteria. Classification was performed by using cluster analysis of regression coefficients obtained by modelling weekly measurements by the second device on the measurements from the first device. Results of this analysis indicate the existence of five periods in which the regression lines show certain similarities. Further attention is paid to their analysis.
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Application of growth models for local assessment of the impact of climate change on selected crops
Hlavinka, Petr ; Trnka, Miroslav ; Balek, Jan ; Dubrovský, Martin ; Pohanková, Eva ; Žalud, Zdeněk
This publication is focused on the description of specialized software named as crop growth models and its using emphasizing the application for climate change impact assessment at local scale. The ambition of this publication is to introduce brief history of the crop growth models development, its classification, actual trends of their progress and applications and last but not least, present procedure leading to the preparation of the input datasets, the initial setup, parameters calibration, validation through set of independent datasets and consequently the implementation of climate change scenarios for assessment of possible impact of future conditions on selected important field crops and set of representative sites in the Czech Republic.
Fulltext: content.csg -  PDF
Plný tet: Metodika_rustove_modely_2015 - PDF
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The right to information as a fundamental human right
Kolman, Jiří
When analysing free access to information of the EU institutions it is needed to clarify the fundamental theoretical question of law, if that law can be considered as a basic human right exercisable, inter alia, in international law application. Currently EU law oscillates between supranational approach and intergovernmental point of view using diplomacy rules (international law). Is there, in the case of the EU institutions, space for full access to information, as we are used to it in the case of the EU member states?
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Attribution of European temperature variability during 1882–2010: A statistical perspective
Mikšovský, Jiří ; Pišoft, P.
Gridded monthly temperature data (GISTEMP and Berkeley Earth) covering the European region were investigated for the presence of components attributable to climate forcings, both anthropogenic and natural, and to major modes of internal climate variability. Effects of individual predictors were separated by multiple linear regression applied to time series over 1882–2010. It was shown that the presence of a warming trend correlated with greenhouse gases concentration was generally strong in European temperatures and typically combined with mild cooling ascribable to anthropogenic aerosols. Components attributable to variations in solar activity were rather weak and not statistically significant in most locations, as were the imprints of large volcanic eruptions. A strong association between North Atlantic Oscillation phase and temperature was confirmed for much of Europe, while temperature oscillations synchronized with the El Niño Southern Oscillation were quite limited in magnitude and displayed low levels of statistical significance. The influence of the Atlantic Multidecadal Oscillation was noticeable particularly in the western-most parts of Europe, whereas the Pacific Decadal Oscillation’s significant impact extended to Scandinavia.
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Flux footprints in different ecosystems
Macálková, Lenka ; Havránková, Kateřina ; Pavelka, Marian
Flux footprint is an upwind area where the atmospheric flux measured by an instrument is generated. Footprint size depends on measurement height, surface roughness, and atmospheric thermal stability. Our study focused on the flux footprints of four CzechGlobe ecosystem stations in a wetlands area, an agroecosystem, and young and mature spruce forests. Our aims were to prove that the sites were suitable for eddy covariance measurement and compare flux footprints under various atmospheric thermal conditions: stable, neutral, and unstable. Two computational models were used: the Kormann–Meixner (2001) and Kljun (2004)models. The outputs were processed graphically in site maps.
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Creation of wind rosettes using the CALMET model
Škáchová, H. ; Vlček, O. ; Trusina, Jan
The CALMETT model is a part of dispersion modeling system (CALPUFF), which is a diagnostical modul for flow fields that counts vertically divided fields of wind direction and wind speed. The model is able to calculate micrometeorological characteristics of the boundary layer above the Earth´s and water surface. To verify the model, test calculations were made at two professional stations CHMI (Praha – Libuš, Mošnov) for the period of 2008 – 2012. Košetice Observatory was chosen for comparison of the stability divided and total height rosettes. The results showed that the CALMETT model is a suitable tool for creating stability divided wind rosettes. When calculating wind rosettes, the correct settings and representativeness of input data should be born in mind.
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