Correcting global solar UV spectra recorded by a Brewer spectroradiometer for its angular response error
Bais, A. F., S. Kazadzis, D. Balis, C. S. Zerefos, and M. Blumthaler
[abstract] This paper presents a methodology for correcting the global UV spectral measurements of a Brewer MKIII spectroradiometer for the error introduced by the deviation of its angular response from the ideal response. This methodology is applicable also to other Brewers, which are currently in operation. The various stages of the methodology are described in detail, together with the uncertainties involved in each stage. Finally global spectral UV measurements with and without the application of the correction are compared with collocated measurements of another spectroradiometer and with model calculations, demonstrating the suitability of the method. Depending on wavelength and on the aerosol loading the cosine correction factors range between 2% and 7%. The uncertainties involved in the calculation of these correction factors were found to be relatively small, ranging from about 0.2% to 2%
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