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Comparison of sum-of-hourly and daily time step standardized ASCE Penman-Monteith reference evapotranspiration

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Abstract

The objective of this study was to quantify differences associated with using 24-h time step reference evapotranspiration (ETo), as compared with the sum of hourly ETo computations with the standardized ASCE Penman-Monteith (ASCE-PM) model for semi-arid dry conditions at Fanaye and Ndiaye (Senegal) and semiarid humid conditions at Sapu (The Gambia) and Kankan (Guinea). The results showed that there was good agreement between the sum of hourly ETo and daily time step ETo at all four locations. The daily time step overestimated the daily ETo relative to the sum of hourly ETo by 1.3 to 8% for the whole study periods. However, there is location and monthly dependence of the magnitude of ETo values and the ratio of the ETo values estimated by both methods. Sum of hourly ETo tends to give higher ETo during winter time at Fanaye and Sapu, while the daily ETo was higher from March to November at the same weather stations. At Ndiaye and Kankan, daily time step estimates of ETo were high during the year. The simple linear regression slopes between the sum of 24-h ETo and the daily time step ETo at all weather stations varied from 1.02 to 1.08 with high coefficient of determination (R 2 ≥ 0.87). Application of the hourly ETo estimation method might help on accurate ETo estimation to meet irrigation requirement under precision agriculture.

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Authors and Affiliations

  1. Africa Rice Center (AfricaRice), Regional Sahel Station, Senegal, B.P. 96, St Louis, Senegal

    Koffi Djaman & Abdoulaye Sow

  2. Department of Biological Systems Engineering, University of Nebraska-Lincoln, 241 L.W. Chase Hall, Lincoln, NE, 68583-0726, USA

    Suat Irmak

  3. Chargé de recherches Agro-hydrologie /Irrigation ISRA, BP, 240, Saint-Louis, Sénégal

    Mamadou Sall

  4. Department of Agricultural and Biosystems Engineering, Makerere University, P.O. Box 7062, Kampala, Uganda

    Isa Kabenge

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  1. Koffi Djaman
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Djaman, K., Irmak, S., Sall, M. et al. Comparison of sum-of-hourly and daily time step standardized ASCE Penman-Monteith reference evapotranspiration. Theor Appl Climatol 134, 533–543 (2018). https://doi.org/10.1007/s00704-017-2291-6

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