Publication of the report “Fourteenth Intercomparison Campaign of the Regional Brewer Calibration Center Europe”

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We are pleased to present the “Fourteenth Intercomparison Campaign of the Regional Brewer Calibration Center Europe”, published as the World Meteorological Organization (WMO) Global Atmospheric Watch (GAW) Report nº 257.

The Fourteenth European Brewer Intercomparison Campaign was organized by the Regional Brewer Calibration Center for Europe (RBCC-E) in collaboration with the “Area of Instrumentation and Atmospheric Research Area” of Instituto Nacional de Tecnica Aeroespacial (INTA), with the support of the Global Atmosphere Watch (GAW) Programme of the World Meteorological Organization (WMO). Alongside this campaign,  another open to all Total Ozone instruments, including Dobson, Brewer, Pandora, BTS, FTIR, SAOZ and CCD spectrometers, was carried out with the objective of comparing the Total Ozone measurements of the different  participating instruments. Also in parallel, an international Brewer course was celebrated in collaboration with the WMO-GAW,  focused on the operational, scientific and technical issues of the Brewer instrument, with emphasis on the ozone, UV and AOD products available at EUBREWNET. In total, close to 20 students from countries all around the world took part in this course. The course talks are available at the EUBREWNET webpage

This is the first time that the WMO publication includes the individual calibration report of the participating instruments who extend the report to 540 pages. This would not have been possible without the AEMET support to the RBCC-E and the EUBREWNET activities throughout TRAGSATEC  (, which provides two staff positions for Alberto Berjón and Javier López-Solano, ensuring and reinforcing the continuation of the RBCC-E activities.

The results of the blind comparison (using the instruments’ original calibration constants)  with the reference instrument Brewer #185 showed very satisfactory results. In agreement with previous campaigns, 6 instruments show an agreement better than 0.5%, which represent (31%) of the participating instruments. Of the remaining instruments, 74% show an agreement inside the 1% range (see Figure 1). After the maintenance tasks, performed by International Ozone Services Inc. (IOS), and using the new determined calibration constant and the stray light correction applied to single monochromator Brewers, the agreement with respect to the reference was very good: +/- 0.5%

The report is a joint publication of the WMO and AEMET  available here






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