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An empirical model to predict the UV-index based on solar zenith angles and total ozone

Published online by Cambridge University Press:  29 March 2004

Marc Allaart
Affiliation:
Royal Netherlands Meteorological Institute (KNMI) Email: allaart@knmi.nl
Michiel van Weele
Affiliation:
Royal Netherlands Meteorological Institute (KNMI) Email: allaart@knmi.nl
Paul Fortuin
Affiliation:
Royal Netherlands Meteorological Institute (KNMI) Email: allaart@knmi.nl
Hennie Kelder
Affiliation:
Royal Netherlands Meteorological Institute (KNMI) Email: allaart@knmi.nl
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Abstract

The clear sky UV-index is expressed as a function of two predictable quantities: the solar zenith angle and total ozone. This function is derived by fitting the measurements of total ozone and the UV-index obtained from two instruments, one in the mid-latitudes and one in the tropics. The shape of the function was chosen so that it represents the essentials of the underlying physics. This new function gives good results for all solar zenith angles between 0° and 90° and a wide range of total ozone values.

Type
Research Article
Copyright
© 2004 Royal Meteorological Society

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