|Title||Mean monthly and mean annual evapotranspiration data (base climatological data sets)|
|Custodian||Bureau of Meteorology|
|Abstract||Mean monthly and mean annual areal actual, areal potential and point potential evapotranspiration grids.
The grids show the 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.
See LINEAGE below for more information.
|Search Word(s)||Gridded, spline, analyses, climatology, evapotranspiration, hydrology, meteorology|
|Geographic Extent Names(s)||Australia|
|General Category||Gridded climatological data|
|General Custodian Jurisdiction||Australian Government
|Geographic Extent Polygon||Not applicable|
|Geographic Bounding Box||See below|
|North Bounding Latitude||-10.1|
|South Bounding Latitude||-43.8|
|East Bounding Longitude||153.85|
|West Bounding Longitude||112.15|
|Stored Data Format||Arc/InfoTM grids - all Australia|
|Available Format Type||ASCII grid-point, Arc/InfoTM grid Interchange (.e00),Shapefiles.|
|Access Constraint||Please note that the copyright for any data supplied by the Bureau of Meteorology is held in the Commonwealth of Australia and the purchaser shall give acknowledgement of the source in reference to the data. Apart from dealings under the Copyright Act 1968, the purchaser shall not reproduce (electronically or otherwise), modify or supply (by sale or otherwise) these data without written permission from the supplier. Please contact us (see details below) for more information.|
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 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 Mortons wet-environment ET and the term point potential ET for Mortons 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.
|Positional Accuracy||The observational (station) data on which the analyses were based have an associated accuracy of the order of 0.01 degrees (approximately 1km) or better.|
|Attribute Accuracy||Grid point data are post-processed.
For more information (metadata) on observing stations please contact us.
|Logical Consistency||Not applicable|
|Completeness||No missing data|
|Contact Organisation||Bureau of Meteorology|
|Contact Position||Climate Data Services|
|Mail Address||PO BOX 1289, Melbourne 3001, Australia|
|Telephone||(03) 9669 4082|
|Facsimile||(03) 9669 4515|
|Additional Metadata||Additional information available on request (see contact above).|