Uncertainties in satellite-derived estimates of surface UV doses

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.

Details

Publication status:
Published
Author(s):
Authors: Martin, T.J., Gardiner, B.G., Seckmeyer, G.

Date:
1 January, 2000
Journal/Source:
Journal of Geophysical Research / 105
Page(s):
27005-27011
Digital Object Identifier (DOI):
https://doi.org/10.1029/2000JD900432