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51.
Ladislav A. Palinkaš Vladimir Bermanec Sibila Borojević Šoštarić Tea Kolar-Jurkovšek Sabina Strmić Palinkaš Ferenc Molnar Goran Kniewald 《Journal of Volcanology and Geothermal Research》2008
The Hruškovec quarry of basaltoid rocks is situated on the northwestern slopes of Mt. Kalnik, within the Zagorje–Mid-Transdanubian zone, a part of the North-western Dinarides. The basaltoids are inter-bedded with radiolarites of the Middle and Upper Triassic age (Langobardian, Carnian–Norian). Spilites, altered diabases and meta-basalts form part of Triassic volcanic-sedimentary sequence, made of sandstones, shales, micritic limestone, altered vitric tuffs and radiolarian cherts, incorporated tectonically into the Jurassic–Cretaceous mélange. 相似文献
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Guano-derived δ13C-based paleo-hydroclimate record from Gaura cu Musca Cave,SW Romania 总被引:1,自引:0,他引:1
Bogdan P. Onac Ferenc L. Forray Jonathan G. Wynn Alexandra M. Giurgiu 《Environmental Earth Sciences》2014,71(9):4061-4069
The δ13C values of 23 unevenly spaced guano samples from a 17-cm long clay sediment profile in Gaura cu Musc? Cave (GM), in SW Romania, made it possible to preliminarily characterize the Medieval Warm Period summer hydroclimate regime. The beginning of the sequence (AD 990) was rather wet for more than a century, before becoming progressively drier. After a brief, yet distinct wet period around AD 1170, drier conditions, with a possible shift from C3 to a mixed C3-dominated/C4 type vegetation (2 ‰ lower δ13C values), prevailed for almost half a century before the climate became colder and wetter at the onset of the Little Ice Age, when bats left the cave. The guano-inferred wet and dry intervals from the GM Cave are mirrored by changes in the color and amount of clay accumulated in the cave. They also agree well with reconstructions based on pollen and charcoal from peat bogs and δ13C and δ18O on speleothems from other Romanian sites. Overall, these results indicate that the δ13C of bat guano can provide a sensitive record of the short-term coupling between local/regional climate and the plant–insect–bat–guano system. 相似文献
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Majzlan Juraj Berkh Khulan Kiefer Stefan Koděra Peter Fallick Anthony E. Chovan Martin Bakos František Biroň Adrián Ferenc Štefan Lexa Jaroslav 《Mineralogy and Petrology》2018,112(1):1-23
Mineralogy and Petrology - In this contribution, we report new data on mineralogy, alteration patterns, geochemistry, fluid properties and source of fluids for the deposit Nová Baňa, one... 相似文献
56.
Ferenc Székely 《Ground water》2013,51(5):762-767
The vertical variation of drawdown around pumping wells generates an induced flow in the observation wells. A set of governing equations is presented to couple the drawdown variation and the vertical flux distribution in observation wells. A numerical example is performed to justify the governing equations and to verify the solution methods used by the simulation software WT. The example analyzes the effect of skin loss, wellbore storage, and vertical segmentation on the drawdown and induced flow in observation well during pumping. The evaluation of the Fairborn pumping test involves a vertically homogeneous and anisotropic water table aquifer, uniform well‐face drawdown conditions in the pumping well and simulation of the drawdown evolution in the observation well with and without the effect of induced flow. The computer calibrations resulted in small differences between the measured and simulated drawdown curves. 相似文献
57.
Zsolt Sàndor Róbert Balla Ferenc Téger Bálint Érdi 《Celestial Mechanics and Dynamical Astronomy》2001,79(1):29-40
We applied the method of the short time Lyapunov indicators to the planar circular and to the planar elliptic restricted three-body problem in order to study the structure of the phase space in some selected regions. In the circular case we computed the short-time averages of the stretching numbers to distinguish between regular and chaotic domains of the phase space. The results obtained in this way are in good agreement with the corresponding Poincaré's surface of sections. Using the short time Lyapunov indicators we determined the detailed structure of the phase space in the semi-major axis-eccentricity plane of the test particle both in the circular and in the elliptic restricted problem (in the latter case for some values of the eccentricities of the primaries) and we studied the main features of the phase space.This revised version was published online in October 2005 with corrections to the Cover Date. 相似文献
58.
Ferenc Kovàcs 《Transactions in GIS》2007,11(6):911-926
As a consequence of the increasing aridity experienced in Hungary in the past decades, any future spatial planning decisions should consider the threat of an arid environment. For identifying sensitive and endangered areas, suitable methods should be developed. These could help those responsible for decision making in providing quick and suitable actions in planning. Through the investigation of vegetation, regional scale variations in the landscape along with the responses of forests to climatic changes can be easily detected. Our primary aim was the evaluation of the natural water supply on the Danube Tisza Interfluve by studying the forests, meadows and pastures of the area in the summers of 1992 and 2004. We investigated with the help of remote sensing the short‐term response of vegetation to the altered environmental conditions. According to the spatial and temporal analyses of vegetation indices (NDVI) based on AVHRR and MODIS images, a considerable decrease in the activity of vegetation can be observed throughout the entire vegetation period. Due to the suspected climatic changes, 33% of the studied vegetation might be endangered. 相似文献
59.
The land-surface flux model (PROGSURF) designed jointly at the Universities of Vienna and Budapest is reviewed; it belongs to the broad spectrum of PILPS1 models. PROGSURF comprises one vegetation layer and three soil layers. Temperature prediction is made by the heat conduction equation in conjunction with the force-restore method. Turbulent heat fluxes are parameterized by gradient laws using the resistance concept. The formula for the canopy surface resistance involves both a parameter describing atmospheric demand and one describing moisture availability. Soil moisture prediction is made with Richards' equation. PROGSURF is tested in off-line mode for the Cabauw data set. The observed annual mean values of the state and flux quantities at the earth's surface are well reproduced. For example, the model yields latent and sensible heat fluxes of −35.3 and −2.4 W/m2, respectively; evapotranspiration and runoff is −449 and 326 mm/yr; and root zone soil moisture content is 0.344 m3/m3. Further, the seasonal changes of water and energy balance components are well simulated. The sensitivity of PROGSURF to the canopy resistance formulation is analysed. We find that the atmospheric demand is largely represented by the saturation value of the evapotranspiration/soil moisture curve with maximum summer impact upon the annual value and further that the moisture availability is represented by the slope of the evapotranspiration curve. Both saturation value and slope control the amplitude of the seasonal fluctuation of the water balance components; at Cabauw site the saturation value is the governing parameter. These results fit satisfactorily into the other PILPS models. In particular, we are able to reproduce with PROGSURF the total variability of most other PILPS models by simply changing the atmospheric demand and soil moisture availability parameters. PROGSURF presently serves to simulate observed surface fluxes for an atmospheric diagnostic model. 相似文献
60.
Windows delineating tolerable or "acceptable" conditions associated with climate change can be defined in terms of a variety of parameters; a preliminary window offered by the Scientific Advisory Council on Global Change of the Federal Government of Germany sets limits on temperature change and the rate of temperature change. Investment in adaptation can alter the size and shape of these windows, and different emissions trajectories are associated with different limiting points on their boundaries. As a result, the value of adaptation depends upon both the underlying structure of the tolerable window and the basecase emissions trajectory. Given uncertainty about both, the best near-term policy should be cast in a sequential decision-making framework. Seen in this light, improved adaptive potential can either reduce the cost of sustaining tolerable climate change or increase the opportunity cost of holding to more restrictive boundaries. 相似文献