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Evapotranspiration : mean annual and mean monthly evapotranspiration (base climatological data sets, 1961 to 1990)

Created 07/10/2024

Updated 07/10/2024

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Mean 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. Gridded 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 (Evapotranspiration) 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.

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Title Evapotranspiration : mean annual and mean monthly evapotranspiration (base climatological data sets, 1961 to 1990)
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/83cbdf05-1f28-4318-b079-6bc121c8a091
Contact Point
Bureau of Meteorology
climatedata@bom.gov.au
Reference Period 28/02/2017
Geospatial Coverage {"type": "Polygon", "coordinates": [[[112.15, -43.8], [153.85, -43.8], [153.85, -10.1], [112.15, -10.1], [112.15, -43.8]]]}
Data Portal data.gov.au