Simplified Penman-Monteith Equation Determined by Temperature-Based Global Radiation Data and Its Multilocal Validation under Subhumid Climatic Conditions in Hungary
The
extent to which specific climatic factors influence evapotranspiration under
subhumid conditions in Hungary was investigated. The reference
evapotranspiration, calculated with the internationally accepted
Penman-Monteith equation proposed by FAO, was
considered. The results show that the influence of radiation, which provides
energy for evaporation, is the strongest factor and that the influence of
global radiation alone is very strong. Taking into account that radiation was
measured under rather limited conditions in space and time, global radiation
was calculated using the Hargreaves method based on temperature. Accordingly,
we have defined a formula based on temperature-based global radiation and verified the data
obtained with the Penman-Monteith formula calculated for 14 meteorological stations. The verification gave good
results, therefore the method can be used for practical purposes in the
subhumid conditions of Hungary based on the data of the nearest meteorological
station.
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