Gridded Average Evapotranspiration - PED

## **Abstract** \n\nThis dataset and its metadata statement were supplied to the Bioregional Assessment Programme by a third party and are presented here as originally supplied.\n\nMean monthly and mean annual areal actual, areal potential and point potential evapotranspiration grids. The grids show evapotranspiration values across Australia in the form of two-dimensional array data. The mean data are based on the standard 30-year period 1961-1990.\n\n## **Purpose** \n\nTo demonstrate distribution of evapotranspiration values over Pedirka subregion.\n\n## **Dataset History** \n\nGridded data were generated using the ANU (Australian National University) 3-D Spline (surface fitting algorithm). The grid point resolution of the data is 0.1 degrees ( approximately 10km). As part of the 3-D analysis process a 0.1 degree resolution digital elevation model (DEM) was used. Approximately 700 stations were used in the analysis, and all input station data underwent a high degree of quality control before analysis, and conform to WMO (World Meteorological Organisation) standards for data quality. Areal Actual ET is the ET that actually takes place, under the condition of existing water supply, from an area so large that the effects of any upwind boundary transitions are negligible and local variations are integrated to an areal average. Areal Potential ET is the ET that would take place, under the condition of unlimited water supply, from an area so large that the effects of any upwind boundary transitions are negligible and local variations are integrated to an areal average. Point Potential ET is the ET that would take place, under the condition of unlimited water supply, from an area so small that the local ET effects do not alter local airmass properties. It is assumed that latent and sensible heat transfers within the height of measurement are through convection only. The above definitions are based on those given by Morton (1983), but we have used the term areal potential ET for Morton's wet-environment ET and the term point potential ET for Morton's potential ET. Morton, F.I. (1983). Operational estimates of areal evapotranspiration and their significance to the science and practice of hydrology. Journal of Hydrology, 66: 1-76.\n\n## **Dataset Citation** \n\nSA Department of Environment, Water and Natural Resources (2015) Gridded Average Evapotranspiration - PED. Bioregional Assessment Source Dataset. Viewed 12 October 2016, http://data.bioregionalassessments.gov.au/dataset/b3bcb3a0-8e7a-4e55-8b4c-05f80ba7ac2f.**摘要** 本数据集及其元数据声明由第三方提交至生物区域评估计划（Bioregional Assessment Programme），此处按原始提交版本呈现。 本数据集包含月均、年均的区域实际蒸散发、区域潜在蒸散发以及点位潜在蒸散发栅格数据。这些栅格以二维数组形式呈现澳大利亚全域的蒸散发数值，其均值数据基于1961-1990年这一标准30年气候基准期。 **目的** 展示佩迪卡（Pedirka）子区域内蒸散发数值的空间分布特征。 **数据集历史** 本栅格数据采用澳大利亚国立大学（Australian National University, ANU）三维样条（3-D Spline，曲面拟合算法）生成。数据的栅格分辨率为0.1度（约10公里）。三维分析过程中使用了分辨率为0.1度的数字高程模型（Digital Elevation Model, DEM）。本次分析共使用约700个气象站点数据，所有输入站点数据在分析前均经过严格质量控制，符合世界气象组织（World Meteorological Organisation, WMO）的数据质量标准。 区域实际蒸散发（Areal Actual ET）指在供水条件受限的真实场景下，当研究区域足够大以至于上游边界过渡的影响可忽略不计，且局地变化被整合为区域平均值时的实际蒸散发量。区域潜在蒸散发（Areal Potential ET）指在供水无限制的理想场景下，当研究区域足够大以至于上游边界过渡的影响可忽略不计，且局地变化被整合为区域平均值时的蒸散发量。点位潜在蒸散发（Point Potential ET）指在供水无限制的理想场景下，当研究区域足够小以至于局地蒸散发不会改变局地气团特性时的蒸散发量。本研究假设测量高度范围内的潜热与显热交换仅通过对流完成。上述定义基于莫顿（Morton, 1983）提出的标准，但本研究将莫顿提出的湿环境蒸散发对应为区域潜在蒸散发，将莫顿提出的潜在蒸散发对应为点位潜在蒸散发。Morton, F.I. (1983). 区域蒸散发的业务估算及其对水文科学与实践的意义. 《水文学报》, 66: 1-76. **数据集引用** 南澳环境、水与自然资源部（SA Department of Environment, Water and Natural Resources）(2015) 栅格平均蒸散发数据集——PED. 生物区域评估源数据集. 2016年10月12日查阅, http://data.bioregionalassessments.gov.au/dataset/b3bcb3a0-8e7a-4e55-8b4c-05f80ba7ac2f.