Uncertainties in satellite-derived estimates of surface UV doses

Martin, T.J.; Gardiner, B.G.; Seckmeyer, G.. 2000 Uncertainties in satellite-derived estimates of surface UV doses. Journal of Geophysical Research, 105 (D22). 27005-27011.

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Satellite-derived maps of surface UV irradiance are currently limited by their poorly assessed accuracy. Here we use an extensive data set of ground-based spectral measurements from two Alpine sites to examine the level of uncertainty expected in model results due to the time-limited nature of some satellite data. When the ozone column, cloud optical depth, and aerosol optical depth supplied to a radiative transfer model are fixed to a single noontime value, the root-mean-square difference between calculations and measurements of the erythemal daily dose is about 20%. The corresponding uncertainty in the monthly dose is less than 5%. The modeled results also show a systematic error that depends on cloud optical depth. The results suggest that satellite-derived maps of UV irradiance cannot be expected to produce accurate values of the daily dose if they rely on a single estimate of the cloud conditions but may be able to provide reasonable estimates of the monthly dose.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: BAS Programmes > Pre 2000 programme
ISSN: 0148-0227
Date made live: 30 Nov 2012 10:20 +0 (UTC)

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