Publication of the paper “EUBREWNET RBCC-E Huelva 2015 Ozone Brewer intercomparison”

The scientific paper “EUBREWNET RBCC-E Huelva 2015 Ozone Brewer Intercomparison” has been published in Atmospheric Chemistry and Physics (ACP) Journal after the public discussion. This work in the framework of the COST ES1207 project (“European Brewer Network”) allows to implement the methodologies developed during the RBCC-E campaigns (Regional Brewer Calibration Center for Europe (RBCC-E / AEMET)) to the European Network. This paper presents the main results of the EUBREWNET 2015 campaign showing the improvements introduced during this COST action on the Brewer total ozone monitoring and describes the current status of the European Brewer Network.

The Brewer Ozone Spectrophotometer has been, for the last 30 years, the reference instrument for total ozone ground-based measurements with more than 200 instruments installed around the world and 50 of them in Europe. The RBCC-E is in charge of the calibration of the European network organizing field campaigns with the travelling reference. In an effort to significantly improve the quality and timeliness of the data, COST Action ES1207 was initiated to form the European Brewer Network – EUBREWNET. The purpose of EUBREWNET is to harmonise observations, data processing, calibrations and operating procedures so that a measurement at one station is entirely consistent with measurements at all the others. Additionally, the Brewer also measures spectral UV irradiance, Sulphur dioxide and aerosol optical depth. Another important point is the link to climate change where tropospheric ozone and aerosols are still regarded as having the largest effect on uncertainties in climate models. The Brewer measures total column ozone which includes both tropospheric and stratospheric ozone whereas satellites struggle with the lower altitudes.

This work shows the agreement of the ozone measurement methodology on the European network and allows to improving the total ozone measurement worldwide. Is remarkable the improvements on the high latitudes and polar stations measurements, the introduction of a new algorithm correct the stray-light effect which causes ozone underestimation.

The full references is:

Redondas, A., Carreño, V., León-Luis, S. F., Hernández-Cruz, B., López-Solano, J., Rodriguez-Franco, J. J., Vilaplana, J. M., Gröbner, J., Rimmer, J., Bais, A. F., Savastiouk, V., Moreta, J. R., Boulkelia, L., Jepsen, N., Wilson, K. M., Shirotov, V., and Karppinen, T.: EUBREWNET RBCC-E Huelva 2015 Ozone Brewer Intercomparison, Atmos. Chem. Phys., 18, 9441-9455,, 2018.

The paper can be downloaded at:

Photo Album of the campaign:

Group Photo of the RBCC-E EUBREWNET campaign, from left to Right: Manuel Gil , Theanos Drosoglou, Keith Wilson, Henri Diemoz, John Rimmer, Kostas Fragkos,Alkiviadis Bais, Alberto Redondas, Illias Fountoulakis, Mithat EKİCİ, Lionel Dlopper, Julian Groebner, Eric Gonzalez, Marisa Cancillo, Michael Brohart, Diamantino Henriquez, Ana Alvarez Piedehierro, Jose Vilaplana, Paul Eriksen, Volodya Savastiouk, Tapani Koskela, Niss Jepsen, Tomi Karppinen, Bentorey Hernandez, Jhon Rimmer, Thomas Carlund, Ana Maria Siani, Veerle De Boc, Patricia, Antonio Serrano, Sergio Leon Luis y Virgilio Carreño.

Brewer instruments calibrated since 2003 by the RBCC-E in regular campaigns (at Huelva and Arosa), Nordic intercompar- isons and the absolute calibrations performed at the Izaña Observatory

Box plot of the percentage differences with respect to the reference grouped by filter for Brewer no. 186, in blue without correction, and in black after applying the correction to filters 3 and 4 (a). Panel (b) shows percentage differences with respect to the reference grouped by filter, without correction (solid dots), and after the application of the correction to filters 3 and 4 (open circles). Colours indicate the number of the filter; see the legend.

Stray Light Characterization with a HeNe Laser during the campaign, Daniel Moreno, Virgilio Carreño and Oleksiy Marianenko

Stray Light Characterization with a HeNe Laser during the campaign, Ilias Fountunakis and Tomi Karppinen.

Stray Light Characterization with a HeNe Laser during the campaign

Optical setup for the StrayLight characterization.


Carlos Marrero calibrating the Brewer #033 installed at S/C de Tenerife

General view of the campaign.

Jose Manuel Vilaplana and Antonio Serrano setting up the BAT (Brewer Angular-Response Tool)

General view of the training course organized during the campaign.

Hereinafter some pictures taken during the campaign.

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