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.
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.
the Creative Commons Attribution 4.0 License.
Research article
| 
30 Oct 2025
Research article |
| 30 Oct 2025
| 30 Oct 2025
Evaluation of the uncertainty of the spectral UV irradiance measured by double- and single-monochromator Brewer spectrophotometers
Área de Investigación e Instrumentación Atmosférica, Instituto Nacional de Técnica Aeroespacial (INTA), El Arenosillo, Huelva, Spain
Departamento de Física, Instituto del Agua, Cambio Climático y Sostenibilidad, Facultad de Ciencias, Universidad de Extremadura, Badajoz, Spain
José M. Vilaplana
Área de Investigación e Instrumentación Atmosférica, Instituto Nacional de Técnica Aeroespacial (INTA), El Arenosillo, Huelva, Spain
Alberto Redondas
Izaña Atmospheric Research Center, Agencia Estatal de Meteorología, Tenerife, Spain
Javier López-Solano
Departamento de Ingeniería Industrial, Universidad de La Laguna, La Laguna, Tenerife, Spain
José M. San Atanasio
Servicio de Redes Especiales, Agencia Estatal de Meteorología, Madrid, Spain
Richard Kift
Department of Earth and Environmental Sciences, University of Manchester, Manchester, UK
Andrew R. D. Smedley
Department of Earth and Environmental Sciences, University of Manchester, Manchester, UK
Pavel Babal
OTT HydroMet, Delftechpark 36, 2628XH, Delft, the Netherlands
Ana Díaz
Servicio de Redes Especiales, Agencia Estatal de Meteorología, Madrid, Spain
Nis Jepsen
National Centre for Climate Research, Danish Meteorological Institute, Copenhagen, Denmark
Guisella Gacitúa
National Centre for Climate Research, Danish Meteorological Institute, Copenhagen, Denmark
Antonio Serrano
Departamento de Física, Instituto del Agua, Cambio Climático y Sostenibilidad, Facultad de Ciencias, Universidad de Extremadura, Badajoz, Spain
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This paper reports on the ground-based validation of the NO2 data produced operationally by the TROPOMI instrument on board the Sentinel-5 Precursor satellite. Tropospheric, stratospheric, and total NO2 columns are compared to measurements collected from MAX-DOAS, ZSL-DOAS, and PGN/Pandora instruments respectively. The products are found to satisfy mission requirements in general, though negative mean differences are found at sites with high pollution levels. Potential causes are discussed.
Felipe Napoleoni, Stewart S. R. Jamieson, Neil Ross, Michael J. Bentley, Andrés Rivera, Andrew M. Smith, Martin J. Siegert, Guy J. G. Paxman, Guisella Gacitúa, José A. Uribe, Rodrigo Zamora, Alex M. Brisbourne, and David G. Vaughan
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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.
Brewer spectroradiometers are widely used instruments that have been monitoring global solar...
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