Calibration effects of the net longwave radiation equation in Penman-type methods at Tateno, Japan

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抄録

Penman-type evapotranspiration (ET) methods are widely used in irrigation water management and water resource planning. To determine the daily reference ET using Penman-type methods, net longwave radiation must be estimated through an empirical net longwave radiation equation based on meteorological data. This paper presents the coefficients of the net longwave radiation equation calibrated using highly accurate data observed at the Tateno observatory, which belongs to the Baseline Surface Radiation Network (BSRN). The daily net longwave radiation calculated with these calibrated coefficients is in better agreement with the observed data as compared with those of the original Penman–Monteith equation in the Food and Agriculture Organization (FAO) Irrigation and Drainage Paper no. 56 (FAO56-PM). In particular, the FAO56-PM cloudiness factor coefficients are more effectively calibrated in this study. The annual mean reference ET calculated through the calibrated FAO56-PM corresponds to approximately 90% of the values calculated using the original coefficients.

収録刊行物

  • Hydrological Research Letters

    Hydrological Research Letters 9(4), 113-117, 2015

    水文・水資源学会/日本地下水学会/日本水文科学会/陸水物理研究会

各種コード

  • NII論文ID(NAID)
    130005129294
  • 本文言語コード
    ENG
  • データ提供元
    J-STAGE 
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