Improving satellite-based estimations of UV index and dose and first assessment of UV in a world-avoided

E. Wiegant, Ministry of Infrastructure and the Environment, Royal Netherlands Meteorological Institute (KNMI), Utrecht University
De Bilt : KNMI

The UV index (UVI) and dose (UVD) are quantities of UV irradiance weighted for its effect on organisms. Both quantities are widely used as informative tools or as proxies  for UV irradiance, commonly used in e.g. skin cancer research. The UVI and UVD can be measured using groundbased spectrometers, or modelled using satellite observations of ozone. The Royal Netherlands Meteorological Institute has developed a UV model with a unique spatial and temporal coverage. This study describes the update of this model. Updates include changing the computation and data sets used, regarding: ground elevation, surface albedo, cloud cover and error estimation. The updated model is used to compute UVI and UVD from the long-term Multi-Sensor Reanalysis of ozone, and compared with ozone fields that would have been present if the 1987 Montreal Protocol had not been adopted. We find that the northern hemisphere ozone depletion event of 2011, which is greatly exaggerated in absence of the Montreal Protocol, has only little effect on UV irradiance.

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(Scientific report = Wetenschappelijk rapport ; WR 2016-01)
With a bibliogr.