Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 25, issue 21
Articles | Volume 25, issue 21
https://doi.org/10.5194/acp-25-14131-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-25-14131-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 25, issue 21
Research article
 | 
30 Oct 2025
Research article |  | 30 Oct 2025

Evaluation of the uncertainty of the spectral UV irradiance measured by double- and single-monochromator Brewer spectrophotometers

Carmen González, José M. Vilaplana, Alberto Redondas, Javier López-Solano, José M. San Atanasio, Richard Kift, Andrew R. D. Smedley, Pavel Babal, Ana Díaz, Nis Jepsen, Guisella Gacitúa, and Antonio Serrano

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Short summary
Brewer spectroradiometers are widely used instruments that have been monitoring global solar ultraviolet (UV) irradiance since the 1990s, playing a key role in solar UV research. The uncertainties of these measurements are rarely evaluated even though they are essential to determine the quality of these measurements. In this work, the uncertainty of 10 Brewers is estimated using the Monte Carlo method, showing that Brewers’ relative uncertainty is less than 5 % for wavelengths above 310 nm.
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