TITLE:
Determination of Reference Evapotranspiration Using Penman-Monteith Method in Case of Missing Wind Speed Data under Subhumid Climatic Condition in Hungary
AUTHORS:
Zoltán Varga-Haszonits, Éva Szalka, Tamás Szakál
KEYWORDS:
Reference Evapotranspiration, Global Radiation, Vapor Pressure Deficit, Sub Humid Climate, Irrigation Requirements of Crops
JOURNAL NAME:
Atmospheric and Climate Sciences,
Vol.12 No.2,
February
16,
2022
ABSTRACT: The reference
evapotranspiration was calculated using Penman-Monteith method proposed.
This method was evaluated on data measured by lysimeter in Szarvas experimental station in Hungary. The results of the two methods were in good
agreement. However, this
method requires an amount of data which is not available at all sites of meteorological
measurement. Therefore it was necessary to investigate which elements
influencing evapotranspiration are important and which elements are less
important. With the help of investigation was indicated that radiation and vapor
pressure deficit play important role in determination of reference
evapotranspiration. Taking into account this there was two possibilities to calculate
evapotranspiration. One of these is to use Penman-Monteith formula with constant wind speed as advised by Allen. Another one is to
neglect wind speed data. Both methods were investigated and the method with constant
wind speed was found better in a subhumid climatic condition
of Hungary.