The 2015 Brewer Intercomparison at El Arenosillo, Spain
The 2015 Regional Brewer Calibration Center-Europe (RBBC-E) intercomparison and work group meeting was held at the El Arenosillo Atmospheric Sounding Station of the Instituto Nacional de Técnica Aeroespacial (INTA) near Huelva, Spain, during the period 26th of May to 5th of June. The annual Brewer intercomparison alternates between El Arenosillo and Arosa in Switzerland.
This year the campaign was also linked to the EUBREWNET ES1207 COST Action and was organized in collaboration with the ‘Area of Instrumentation and Atmospheric Research’ of INTA, with the support of the Global Atmospheric Watch (GAW) program of the World Meteorological Organization (WMO) and a CEOS Cal/Val project of the European Space Agency (ESA).
The meeting was attended by three personnel from Kipp & Zonen; Pavel Babal, Oleksii Marianenko and Keith Wilson. The factory MkIII travelling reference Brewer #158 and a completely new factory reference, #230, were brought to the intercomparison from Delft.
In total 21 Brewers took part. They received an ozone calibration against the RBCC-E traveling reference MkIII instrument, #185. UV calibrations were performed using 1000W DWX quartz halogen lamps. The Kipp & Zonen lamp, recently calibrated at Aalto university in Finland and used for UV calibrations of new Brewers, was compared with lamps of other participants calibrated in other institutes; namely at the Physikalisch-Meteorologisches Observatorium Davos – World Radiation Center (PMOD-WRC) in Davos and at the National Institute of Standards and Technology (NIST) in the US. Additionally, the QASUME unit of PMOD-WRC was present to provide a global UV reference spectrum for the ultraviolet measurements.
Pavel Babal gave a presentation about the 1000W lamp comparison. Five lamps were scanned on one Brewer, MkIII #172 from the University of Manchester in the UK, and the UV response file was generated for each lamp. Four lamps, including the Kipp & Zonen lamp, were in excellent agreement with each other with a discrepancy smaller than 1% from their average. One lamp had a larger error, so the experiment was repeated on Brewer #185 with three lamps. The Kipp & Zonen lamp was again confirmed to be in agreement with the other good lamp.
We would like to thank José Manuel Vilaplana of INTA and Alberto Redondas of RBBC-E for a very well organised intercomparison and for the hospitality during the campaign.
Below you can find the pictures taken by Pavel at he El Arenosillo Atmospheric Sounding Station of the Instituto Nacional de Técnica Aeroespacial (INTA).
Brewers 157, 183 and 185, Tenerife, Spain
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