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Conclusions

Climatologies of UVR have been derived for three stations in Australia. It was found the the daily total erythemal exposures can be expressed in terms of the UV Index as solar noon if the diurnal variability of cloud cover is random. On a monthly averaged scale, estimations of daily total UVR exposures can be obtained with standard deviations of less than 10% independent of location. In Melbourne, the interannual variability in UV irradiances is generally less than 1 UVI at all hours of the days, so that the interannual variations of daily total erythemal exposures are +/- 2MED.

TOMS UVR overpass data have proven very valuable for the validation of UVR measurements from surface instruments, because they provide an independent estimation of UVR under all sky conditions. This is particularly useful for the evaluation of surface UVR measurements at remote sites. The surface data on the other hand provide a higher temporal resolution, so that a combination of TOMS and surface data complement each other and provide a comprehensive monitoring tool for the environmental UVR. Access to regularly updated TOMS UVR overpass data would be very useful for the operations of surface UVR networks.