GAW Report No. 248

Twelfth Intercomparison Campaign of the Regional Brewer Calibration Center Europe


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Published in
Geneva
Year published
2019
Summary

XII Regional intercomparison of the Brewer Calibration Center for Europe (RBCC-E) was held at El Arenosillo Atmospheric Sounding Station of the “Instituto Nacional de Técnica Aeroespacial” (INTA) during the period 29 of May to – 7 of June, 2019. 20 Brewer spectrometers, 15 operators and experts from 9 countries took part in XII Regional intercomparison campaign. This campaign is part of the EUBREWNET ES1207 COST Action and is organized in collaboration with the “Area of Instrumentation and Atmospheric Research Area” of INTA, with the support of the Global Atmospheric Watch (GAW) program of the World Meteorological Organization (WMO). This campaign will be used as demonstration campaign of the calibration methodologies and error assessment developed by the EMRP ATMOZ project (Traceability of Atmospheric Total Ozone).The action focuses on the calibration of Brewer spectrophotometers from Europe and North Africa. The RBCC-E will provide ozone and Aerosol Optical Depth (AOD) calibration against the RBCC-E reference, whereas the QASUME unit of the Physikalisch-Meteorologisches Observatorium Davos / World Radiation Center (PMOD /WRC) will provide a global UV reference spectrum for the ultraviolet measurements. The initial Brewer comparison results (using the instruments’ original calibration constants) indicate that the overall agreement is slightly lower than in the previous campaign

during this campaign 44% of the instruments present an ozone deviation lower than 1% with respect to the reference. On this campaign 72% of the instruments agree on the 2% range whereas in previous campaigns around 75% of the instruments reached this agreement. After the maintenance tasks, performed by International Ozone Services Inc. (IOS), 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%.

Language of publication
English
Number of pages
103 p.
Format
Digital
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Serial title, number
GAW Report No. 248
WMO Programmes
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