Sensitivity of the Penman–Monteith Reference Evapotranspiration Equation to Meteorological Variables for Puerto Rico
Sensitivity of the Penman–Monteith Reference Evapotranspiration Equation to Meteorological Variables for Puerto Rico
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DOI：
10.3390/hydrology10050101
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发表时间：
2023-04
期刊：
影响因子：
3.2
通讯作者：
M. Irizarry-Ortiz;E. Harmsen
中科院分区：
文献类型：
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作者：
M. Irizarry-Ortiz;E. Harmsen
参考蒸散量（ETo）的时空变化是敏感的气象数据在其估计。评估了波多黎各岛的ASCE标准化ETo方程对GOES-PRWEB数据集气象变量的敏感性。在全岛范围内，ETo对日平均相对湿度（RHmean）最敏感，其次是太阳辐射，日最高（Tmax）和最低（Tmin）气温和风速，平均绝对相对敏感系数（SC）分别为0.98，0.57，0.50，0.27和0.12。导出的SC指导的ETo估计从两个降尺度的气候模式（CNRM和CESM）的气象数据的偏差校正的优先顺序。SC被应用于评估如何气象变量有助于模型误差和预测未来的变化，在ETO从1985-2005年到2040-2060年在南方灌溉农场。由于Tmax和Tmin的预计增加以及RH平均值的降低，两种模型均预测每年ETo平均增加5.6%。尽管ETO对RH平均值的相对变化最为敏感，但RH平均值、Tmax和Tmin对ETO未来变化的贡献是相似的。CESM预测3月、11月和12月的ETo增加，增加了作物水分胁迫的可能性。研究的局限性进行了讨论。
Spatiotemporal variations in reference evapotranspiration (ETo) are sensitive to the meteorological data used in its estimation. The sensitivity of the ASCE standardized ETo equation to meteorological variables from GOES-PRWEB dataset was evaluated for the island of Puerto Rico. Island wide, ETo is most sensitive to daily mean relative humidity (RHmean), followed by solar radiation, daily maximum (Tmax) and minimum (Tmin) air temperatures, and wind speed with average absolute relative sensitivity coefficients (SCs) of 0.98, 0.57, 0.50, 0.27, and 0.12, respectively. The derived SCs guided the prioritization of bias correction of meteorological data for ETo estimation from two downscaled climate models (CNRM and CESM). The SCs were applied to evaluate how meteorological variables contribute to model errors and projected future changes in ETo from 1985–2005 to 2040–2060 at irrigated farms in the south. Both models project a 5.6% average increase in annual ETo due to projected increases in Tmax and Tmin and a decrease in RHmean. Despite ETo being most sensitive to relative changes in RHmean, the contributions from RHmean, Tmax, and Tmin to future changes in ETo are similar. CESM projects increases in ETo in March, November, and December, increasing the potential for crop water stress. Study limitations are discussed.