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The climatic water balance of Slovakia based on the FAO Penman-Monteith potential evapotranspiration

In: Geografický časopis, vol. 60, no. 1
Tomáš Hlásny - Peter Baláž
Detaily:
Rok, strany: 2008, 15 - 30
Kľúčové slová:
climatic water balance, potential evapotranspiration, FAO Penman-Monteith method, Budyko’s method, Slovakia
O článku:
Recently, a great deal of attention has been paid to climate modelling, mainly because of the high vulnerability of society to climatic extremes. Climatic water balance, as the difference between precipitation and evapotranspiration, is an important indicator of landscape humidity, frequently used in bioclimatology. While precipitation can be measured directly at meteorological stations, the potential evapotranspiration must be derived analytically. It has been modelled in a GIS environment using publicly available climatic data. The FAO Penman-Monteith equation was used to assess it for the whole of Slovakia. Selected tools of geostatistics were used to produce the maps of underlying climate variables. It is generally agreed that altitude controls the spatial distribution of the climatic water balance. We derived a regression equation to describe this relationship. This enables the rough calculation of climatic water balance by regression of elevation data. The majority of former studies in Slovakia were based on Budyko’s method for PET calculation. To allow comparison of the results of this study with previous studies, differences between the outputs of both methods have been analysed statistically at 35 meteorological stations. The T-test of dependent samples and Wilcoxon matched paired test were used for the analysis. These proved that the FAO Penman-Monteith method gives significantly higher values than Budyko’s method during the whole year. Both constant wind speed of 2 m s-1 and actual wind speed at each meteorological station were used for the calculations. All the statistics and maps are given in the paper.
Ako citovať:
ISO 690:
Hlásny, T., Baláž, P. 2008. The climatic water balance of Slovakia based on the FAO Penman-Monteith potential evapotranspiration. In Geografický časopis, vol. 60, no.1, pp. 15-30. 0016-7193.

APA:
Hlásny, T., Baláž, P. (2008). The climatic water balance of Slovakia based on the FAO Penman-Monteith potential evapotranspiration. Geografický časopis, 60(1), 15-30. 0016-7193.