How significant is the effect of the surface characteristics on the Reference Evapotranspiration estimates?

Stavros Alexandris and Nikolaos Proutsos

Agricultural Water Management, 2020, vol. 237, issue C

Abstract: Estimated Reference Evapotranspiration (ETo), requires the meteorological attributes to be taken above standardized well-watered and vegetation-covered surfaces. However, worldwide such vegetation-reference sites are not common. This results in mistaken estimates of ETo by using the well-known and extensively applied FAO-56 Penman–Monteith formula. Consequently, the use of inappropriate data for ETo estimation from non-ideal surfaces, leads to significant and systematic cumulative errors introducing uncertainties when determining the crop water requirements in a region. Additionally, the existing climatic stations are not spatially distributed but rather concentrated mostly in non-rural urban areas or in local airports, operating above non–standardized surfaces.

Keywords: Reference Evapotranspiration ETo; Penman-Monteith method; Hargreaves-Samani method; bare soil evaporation; vegetation covered surface (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:agiwat:v:237:y:2020:i:c:s0378377419322577

DOI: 10.1016/j.agwat.2020.106181

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