Brief description
Mean monthly solar radiation was modelled across Australia using topography from the 1 arcsecond resolution SRTM-derived DEM-S and climatic and land surface data. The SRAD model (Wilson and Gallant, 2000) was used to derive:•\tIncoming short-wave radiation on a sloping surface
•\tShort-wave radiation ratio (shortwave on sloping surface / shortwave on horizontal surface)
•\tIncoming long-wave radiation
•\tOutgoing long-wave radiation
•\tNet long-wave radiation
•\tNet radiation
•\tSky view factor
All radiation values are in MJ/m2/day except for short-wave radiation ratio which has no units. The sky view factor is the fraction of the sky visible from a grid cell relative to a horizontal plane.
The radiation values are determined for the middle day of each month (14th or 15th) using long-term average atmospheric conditions (such as cloudiness and atmospheric transmittance) and surface conditions (albedo and vegetation cover). They include the effect of terrain slope, aspect and shadowing (for sun positions at 5 minute intervals from sunrise to sunset), direct and diffuse radiation and sky view.
The monthly data in this collection are available at 3 arcsecond resolution as single (mosaicked) grids for Australia in TIFF format.
The 3 arcsecond resolution versions of these radiation surfaces have been produced from the 1 arcsecond resolution surfaces, by aggregating the cells in a 3x3 window and taking the mean value.
The 1 arcsecond tiled data can be found here: https://data.csiro.au/dap/landingpage?pid=csiro:9632 . The 1 arcsecond mosaic data can be found here: https://data.csiro.au/dap/landingpage?pid=csiro:18491
Lineage: Source data
1. 1 arcsecond SRTM-derived Smoothed Digital Elevation Model (DEM-S; ANZCW0703014016)
2. Aspect derived from the 1 arcsecond SRTM DEM-S
3. Slope derived from the 1 arcsecond SRTM DEM-S
4. Monthly cloud cover fraction (Jovanovic et al., 2011)
5. Monthly albedo derived from AVHRR (Donohue et al., 2010)
6. Monthly minimum and maximum air temperature (Bureau of Meteorology)
7. Monthly vapour pressure (Bureau of Meteorology)
8. Monthly fractional cover (Donohue et al., 2010)
9. Monthly black-sky and white-sky albedo from MODIS (MCD43A3, B3) (Paget and King, 2008; NASA LP DAAC, 2013)
10. Measurements of daily sunshine hours, 9 am and 3pm cloud cover, and daily solar radiation from meteorological stations around Australia (Bureau of Meteorology)
Solar radiation model
Solar radiation was calculated using the SRAD model (Wilson and Gallant, 2000), which accounts for:
\tAnnual variations in sun-earth distance
\tSolar geometry based on latitude and time of year
\tThe orientation of the land surface relative to the sun
\tShadowing by surrounding topography
\tClear-sky and cloud transmittance
\tSunshine fraction (cloud-free fraction of the day) in morning and afternoon
\tSurface albedo
\tThe effects of surface temperature on outgoing long-wave radiation, which is modulated by incoming radiation and moderated by vegetation cover
\tAtmospheric emissivity based on vapour pressure
All input parameters were long-term averages for each month, i.e., monthly climatologies of cloud cover, air temperature, vapour pressure, fractional cover, AVHRR albedo and MODIS albedo.
Circumsolar coefficient was fixed both spatially and temporally at 0.25, while clear sky atmospheric transmissivity and cloud transmittance were varied. Transmittance measures the fraction of radiation passing through a material (air or clouds in this case), while transmissivity measures that fraction for a specified amount of material. SRAD uses a transmittance parameter for cloud, representing an average of all cloud types during cloudy periods, and a transmissivity parameter for clear sky so that the transmittance can vary with the position of the sun in the sky and hence the thickness of atmosphere that radiation passes through on its way to the ground. The clear sky transmissivity τ and cloud transmittance β were calibrated using observed daily radiation and sunshine hours.
References
Donohue R. J., McVicar T. R. and Roderick M. L. (2010a). Assessing the ability of potential evaporation formulations to capture the dynamics in evaporative demand within a changing climate. Journal of Hydrology, 386, 186-197, doi:10.1016/j.jhydrol.2010.03.020.
Donohue, R. J., T. R. McVicar, L. Lingtao, and M. L. Roderick (2010b). A data resource for analysing dynamics in Australian ecohydrological conditions, Austral Ecol, 35, 593–594, doi: 10.1111/j.1442-9993.2010.02144.x.
Erbs, D. G., S. A. Klein, and J. A. Duffie (1982), Estimation of the diffuse radiation fraction for hourly, daily and monthly-average global radiation, Solar Energy, 28(4), 293-302.
Jovanovic, B., Collins, D., Braganza, K., Jakob, D. and Jones, D.A. (2011). A high-quality monthly total cloud amount dataset for Australia. Climatic Change, 108, 485-517.
NASA Land Processes Distributed Active Archive Center (LP DAAC) (2013). MCD43A3, B3. USGS/Earth Resources Observation and Science (EROS) Center, Sioux Falls, South Dakota
Paget, M.J. and King, E.A. (2008). MODIS Land data sets for the Australian region. CSIRO Marine and Atmospheric Research Internal Report No. 004. https://remote-sensing.nci.org.au/u39/public/html/modis/lpdaac-mosaics-cmar
Wilson, J.P. and Gallant, J.C. (2000) Secondary topographic attributes, chapter 4 in Wilson, J.P. and Gallant, J.C. Terrain Analysis: Principles and Applications, John Wiley and Sons, New York.
Available: 2020-12-18
Data time period: 2000-02-11 to 2000-02-22
Subjects
Australia |
ECOLOGY Landscape |
Environmental Sciences |
Ecological Applications |
Environmental Management |
Environmental Management |
LAND Topography Models |
Land Surface |
Land Capability and Soil Productivity |
Landscape Ecology |
Monthly incoming longwave radiation |
Natural Resource Management |
Soil Sciences |
Soil Sciences Not Elsewhere Classified |
TERN_Soils |
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Identifiers
- DOI : 10.4225/08/578884AA56FA2
- Handle : 102.100.100/39915
- URL : data.csiro.au/collection/csiro:18492