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首页> 外文期刊>Journal of the American Water Resources Association >Accuracy Assessment of NOAA Gridded Daily Reference Evapotranspiration for the Texas High Plains
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Accuracy Assessment of NOAA Gridded Daily Reference Evapotranspiration for the Texas High Plains

机译：德克萨斯高平原NOAA网格日参考蒸散量的准确性评估

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摘要

The National Oceanic and Atmospheric Administration (NOAA) provides daily reference evapotranspiration (ETref) maps for the contiguous United States using climatic data from North American Land Data Assimilation System (NLDAS). This data provides large-scale spatial representation of ETref, which is essential for regional scale water resources management. Data used in the development of NOAA daily ETref maps are derived from observations over surfaces that are different from short (grass ETos) or tall (alfalfa ETrs) reference crops, often in nonagricultural settings, which carries an unknown discrepancy between assumed and actual conditions. In this study, NOAA daily ETos and ETrs maps were evaluated for accuracy, using observed data from the Texas High Plains Evapotranspiration (TXHPET) network. Daily ETos, ETrs and the climatic data (air temperature, wind speed, and solar radiation) used for calculating ETref were extracted from the NOAA maps for TXHPET locations and compared against ground measurements on reference grass surfaces. NOAA ETref maps generally overestimated the TXHPET observations (1.4 and 2.2mm/day ETos and ETrs, respectively), which may be attributed to errors in the NLDAS modeled air temperature and wind speed, to which reference ETref is most sensitive. Therefore, a bias correction to NLDAS modeled air temperature and wind speed data, or adjustment to the resulting NOAA ETref, may be needed to improve the accuracy of NOAA ETref maps.
机译：美国国家海洋和大气管理局（NOAA）使用来自北美土地数据同化系统（NLDAS）的气候数据，为美国连续地区提供每日参考蒸散量（ETref）图。该数据提供了ETref的大规模空间表示，这对于区域规模的水资源管理至关重要。 NOAA每日ETref图的开发中所使用的数据是从与短（草ETos）或高（苜蓿ETrs）参考作物不同的表面观察得出的，通常在非农业环境中，假定和实际条件之间存在未知的差异。在这项研究中，使用得克萨斯州高平原地区蒸发蒸腾（TXHPET）网络的观测数据评估了NOAA每日ETos和ETrs图的准确性。从NOAA图中提取TXHPET位置的每日ETos，ETrs和用于计算ETref的气候数据（气温，风速和太阳辐射），并与参考草面上的地面测量值进行比较。 NOAA ETref图通常高估了TXHPET观测值（分别为1.4和2.2mm / day ETos和ETrs），这可能归因于参考ETref最敏感的NLDAS建模的气温和风速误差。因此，可能需要对NLDAS建模的气温和风速数据进行偏差校正或对所得NOAA ETref进行调整，以提高NOAA ETref映射的准确性。

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