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Pracny P.,Masaryk University | Faimon J.,Masaryk University | Kabelka L.,Geotest a.s. | Hebelka J.,Cave Administration of the Czech Republic
Carbonates and Evaporites | Year: 2015

Carbon dioxide (CO2) was studied in Punkva Caves in the Moravian Karst (Czech Republic) during a one-year period from February 2012 to March 2013. Partial pressures of the CO2 corresponding to aqueous carbonates, (Formula presented.) (10−2.91–10−2.35, i.e., 0.12–0.45 vol%), and those participating in the initial dripwater formation, (Formula presented.) (10−1.77–10−1.49, i.e., 1.7–3.2 vol%), were calculated from dripwater hydrogeochemistry, and compared with the partial pressure in cave air, (Formula presented.) (10−3.31–10−2.49, i.e., 0.06–0.32 vol%). Both the (Formula presented.) and (Formula presented.) showed clear seasonal variations with maxima in summer and minima in winter. In contrast, the (Formula presented.) was very stable without any significant seasonality, which could indicate its independence on surface conditions. As an exception, one anomalous drip with significantly lower and varying (Formula presented.), (Formula presented.), and SIcalcite was recognized as a result of prior calcite precipitation. Evolution of dripwater during CO2 degassing and calcite precipitation is demonstrated in detail in a geochemical model. The study presents new data indicating that the CO2 source might be deployed in deeper parts of karst profile (epikarst) in addition to karst soils. © 2015 Springer-Verlag Berlin Heidelberg Source


Faimon J.,Masaryk University | Licbinska M.,Masaryk University | Licbinska M.,VSB - Technical University of Ostrava | Zajicek P.,Cave Administration of the Czech Republic
International Journal of Speleology | Year: 2012

Carbon dioxide concentration, air temperature, and humidity were monitored at (1) two cave sites and (2) three adjacent karst soils. The data over a one-year period are supported by dripwater chemistry and cave visiting frequency. The results indicate that the sources of cave CO 2 are anthropogenic and epikarstic ones in addition to ordinary soils. Epikarstic CO 2 produced under almost stationary conditions probably control dripwater chemistry and cave's CO 2 maxima. Based on breathing and door opening, anthropogenic activity affects instantaneous cave CO 2 levels, depending on site volume/position and visitor number. A conceptual model of the CO 2 dynamics of the soil-cave system is proposed. The study indicates that karst processes such as limestone dissolution and speleothem growth need not be entirely/directly controlled by external climatic conditions. Source


Ruzicka V.,Academy of Sciences of the Czech Republic | Mlejnek R.,Cave Administration of the Czech Republic | Jurickova L.,Charles University | Tajovsky K.,Academy of Sciences of the Czech Republic | And 2 more authors.
Acta Carsologica | Year: 2016

The invertebrates of the Macocha Abyss, Moravian Karst, Czech Republic, were collected in 2007-2008 and 222 species were identified in total. The relative abundance of individual taxa of land snails, harvestmen, pseudoscorpions, spiders, millipedes, centipedes, terrestrial isopods, beetles, and ants was evaluated. The cold-adapted mountain and subterranean species inhabit the bottom and lower part of the abyss, whereas the sun-exposed rocky margins were inhabited by thermophilous species. Macocha harbors several threatened species that are absent or very rare in the surrounding habitats. In the forest landscape, the Macocha Abyss represents a natural habitat with a distinct microclimatic gradient, and is an excellent refuge area for psychrophilous as well as thermophilous species, which significantly contributes to maintenance of landscape biodiversity. © 2016, Zalozba Z R C. All rights reserved. Source


Litschmann T.,AMET Association of Velke Bilovice | Roznovsky J.,Czech Hydrometeorological Institute | Roznovsky J.,Mendel University in Brno | Streda T.,Czech Hydrometeorological Institute | And 4 more authors.
Contributions to Geophysics and Geodesy | Year: 2012

The paper deals with the evaluation of temperature and humidity measurements in the vertical profile of Macocha Abyss (Moravian Karst, South Moravia, Czech Republic). The measuring profile on a rock wall is made up of seven HOBO-PRO sensors. Two other meteorological stations are installed at the bottom and near the upper edge of the abyss. The evaluation was designed separately for warm season (June 1, 2008 to August 31, 2008) and cold season (November 1, 2008 to February 28, 2009). In the warm season, distribution of inverse temperatures dominated in the abyss. Temperature differences between the bottom of the abyss and its upper edge reached about 10 °C. At the bottom of the abyss, the minimum temperatures proved to be higher than at its upper edge and in its vicinity. Thermal circulation is evident to the depth of about 60 m. The highest temperatures were observed in the deeper layers of the abyss in the warm period at around 10 a.m. of Central European Summer Time. Towards the upper edge of the abyss, the hour of daily maximum temperature shifts to 2 to 4 p.m. In the cold season, the minimum temperature was observed between 6 and 7 a.m. of Central European Time. A decrease in the accumulation of cold air (cold-air pool formation) was not found in the lower floors of the abyss. This phenomenon does not occur even during clear nights. The depth of 60 m from the upper edge of the area maintains a high relative humidity (above 95%) in the warm season. However, humidity decreases from this depth towards the top of the abyss. In the cold season, the whole abyss is filled with air with relative humidity of 90 to 95%. Source

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