Assessing suitability of temperature-based reference evapotranspiration methods for semi-arid basin of Maharashtra

Authors

  • P.S. WABLE International Crop Research Institute for the Semi-Arid Tropics, Hyderabad, India
  • M.K. JHA Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, India
  • S.D. GORANTIWAR Dr. A. S. College of Agricultural Engineering, Mahatma Phule Krishi Vidyapeeth, Rahuri, India

DOI:

https://doi.org/10.54386/jam.v21i3.259

Keywords:

FAO Penman-Monteith method, temperature-based Penman-Monteith method, Hargreaves method, ET mapping, limited data, semi-arid region

Abstract

FAO Penman-Monteith (FAO-PM) is deemed as a sole standard method for estimating reference evapotranspiration (ET ). However, limited availability of meteorological data at spatial and temporal o scales restricts the application of this method. To address this issue, the FAO 56 experts suggested three methods when only maximum and minimum temperature data are available: (i) Temperature-based Penman-Monteith (PMT-1) method wherein T ≈ T (ii) PMT-2 wherein T ≈ T -2.5, and (iii) dew min dew min Hargreaves method. These ET methods were assessed for a semi-arid basin of Western India which lacks adequate climatic data. The performances of the ET methods were evaluated against the standard FAO-PM method using salient statistical and graphical indicators, together with the sensitivity analysis. The results of the three temperature-based methods had a tendency of over-predication of ET in the study area. The PMT-1 method, however, provided superior ET estimates compared to PMT-2 and Hargreaves methods. For estimating monthly ET , the FAO-PM method was most sensitive to temperature. Further, ET of the monsoon season over the study area increased from 5 to 12% during 'drought' years compared to 'normal' years. It was concluded that PMT-1 method is the most suitable temperature-based method for estimating ET in semi-arid regions under limited climatic condition.

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Published

01-09-2019

How to Cite

P.S. WABLE, M.K. JHA, & S.D. GORANTIWAR. (2019). Assessing suitability of temperature-based reference evapotranspiration methods for semi-arid basin of Maharashtra. Journal of Agrometeorology, 21(3), 351–356. https://doi.org/10.54386/jam.v21i3.259

Issue

Vol. 21 No. 3 (2019): September

Section

Research Paper

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