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The effect of reference-condition-based temperature modification on the trend of reference evapotranspiration in arid and semi-arid regions

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  • Khanmohammadi, Neda
  • Rezaie, Hossein
  • Montaseri, Majid
  • Behmanesh, Javad

Abstract

Reference evapotranspiration (ET0) has a significant role in agricultural water management. Commonly, FAO56 Penman-Monteith as standard method is used to calculate ET0. To apply this method, meteorological data recorded at reference stations are required. The use of non-reference stations data in ET0 calculation can affect trend of this parameter. In the present study, the effect of reference-condition-based temperature modification on ET0 trend was evaluated. For this purpose, the collected data from 27 non-reference meteorological stations during 1960–2014 were applied. The mentioned stations are located in arid or semi-arid regions of Iran. The trends of unchanged and modified values of ET0 in studied stations were calculated using the Mann-Kendall method. Trend results showed that unchanged values of ET0 had a positive trend, while the modified ones had a negative trend in more than 50% of stations at seasonal and annual scales. According to R2 and RMSE results, there was no correlation between the trends of unchanged and modified values of ET0 and temperature modification based on the reference condition can change the trend values of ET0. Also, the results of T-statistic showed that the difference between two values of trend in arid regions was more than that of semi-arid ones. This difference in stations with arid climate was significant at 95% confidence level.

Suggested Citation

  • Khanmohammadi, Neda & Rezaie, Hossein & Montaseri, Majid & Behmanesh, Javad, 2017. "The effect of reference-condition-based temperature modification on the trend of reference evapotranspiration in arid and semi-arid regions," Agricultural Water Management, Elsevier, vol. 194(C), pages 204-213.
    • Handle: RePEc:eee:agiwat:v:194:y:2017:i:c:p:204-213
    DOI: 10.1016/j.agwat.2017.09.010
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    References listed on IDEAS

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    1. Neda Khanmohammadi & Hossein Rezaie & Majid Montaseri & Javad Behmanesh, 2017. "The Effect of Temperature Adjustment on Reference Evapotranspiration and Reconnaissance Drought Index (RDI) in Iran," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 31(15), pages 5001-5017, December.
    2. Pes, Marcelo P. & Pereira, Enio B. & Marengo, Jose A. & Martins, Fernando R. & Heinemann, Detlev & Schmidt, Michael, 2017. "Climate trends on the extreme winds in Brazil," Renewable Energy, Elsevier, vol. 109(C), pages 110-120.
    3. Acharjee, Tapos Kumar & Halsema, Gerardo van & Ludwig, Fulco & Hellegers, Petra, 2017. "Declining trends of water requirements of dry season Boro rice in the north-west Bangladesh," Agricultural Water Management, Elsevier, vol. 180(PA), pages 148-159.
    4. Hossein Tabari & Safar Marofi, 2011. "Changes of Pan Evaporation in the West of Iran," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 25(1), pages 97-111, January.
    5. Mojtaba Shadmani & Safar Marofi & Majid Roknian, 2012. "Trend Analysis in Reference Evapotranspiration Using Mann-Kendall and Spearman’s Rho Tests in Arid Regions of Iran," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 26(1), pages 211-224, January.
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