Comparison of Net Longwave Radiation Equation in Penman-Type Evapotranspiration Equation

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  • ペンマン型蒸発散量推定式における有効長波放射量推定式の比較
  • ペンマンガタジョウハッサンリョウ スイテイシキ ニ オケル ユウコウ チョウハ ホウシャリョウ スイテイシキ ノ ヒカク

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Abstract

I examined the accuracy of the common net long-wave radiation equations adopted in Penman-type evapotranspiration equations. Net longwave radiation was calculated from upward and downward longwave radiation fluxes observed in Tateno, Japan. The following became apparent. 1) The equation proposed by Penman shows the minimum RMSE of all the equations used, although its estimates are more likely to vary widely; 2) the two equations recommended by the FAO tend to underestimate net longwave radiation flux throughout a year; 3) annual potential evapotranspiration, calculated using Penman's net longwave radiation equation, appears to show less error than other equations, whereas the FAO's net longwave radiation equations might overestimate annual potential evapotranspiration by approximately 100 mm per year; 4) parameters of net longwave radiation equation should be calibrated based on high-accuracy observations in Japan.

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