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Evapotranspiration under advective conditions

Abstract

Arid and semi-arid regions are heterogeneous landscapes in which irrigated fields are surrounded by arid areas. The advection of sensible heat flux from dry surfaces is a significant source of energy that has to be taken into consideration when evaluating the evaporation from crops growing in these areas. The basic requirement of most of the common methods for estimating evapotranspiration [Bowen ratio, aerodynamic and Penman–Monteith (PM) equation] is that the horizontal fluxes of sensible and latent heat are negligible when compared to the corresponding vertical fluxes. We carried out measurements above an irrigated tomato field in a desert area. Latent and sensible heat fluxes were measured using a four-level Bowen machine with aspirated psychrometers. Our results indicate that under advective conditions only measurements carried out in the lowest layer are satisfactory for the estimation of latent heat fluxes and that the use of the PM equation with an appropriately parameterized canopy resistance may be preferable.

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Acknowledgements

During her visit to the Jacob Blaustein Institute of the Ben Gurion University of the Negev P. Figuerola received a fellowship from the FOMEC (University of Buenos Aires, Argentina) and from the CONICET (National Council for Science and Technology, Argentina).

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This work was carried out by the author during her sojourn at the Wyler Department for Drayland Agriculture, Jacob Blaustein Institute for Desert Research, Ben Gurion University of the Negev, Israel.

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Figuerola, P.I., Berliner, P.R. Evapotranspiration under advective conditions. Int J Biometeorol 49, 403–416 (2005). https://doi.org/10.1007/s00484-004-0252-0

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  • DOI: https://doi.org/10.1007/s00484-004-0252-0

Keywords

  • Evapotranspiration
  • Advection
  • Evapotranspiration models