Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 13 2008 10.5194/acp-8-3369-2008 http://www.atmos-chem-phys.net/8/3369/2008/ http://www.atmos-chem-phys.net/8/3369/2008/acp-8-3369-2008.html http://www.atmos-chem-phys.net/8/3369/2008/acp-8-3369-2008.pdf 3369 3383 2008-06-30 Quality assurance of the Brewer spectral UV measurements in Finland K. Lakkala kaisa.lakkala@fmi.fi A. Arola A. Heikkilä J. Kaurola T. Koskela E. Kyrö A. Lindfors O. Meinander A. Tanskanen J. Gröbner G. Hülsen Finnish Meteorological Institute, Arctic Research Centre, Sodanlylä, Finland Finnish Meteorological Institute, Helsinki, Finland Physikalisches Meteorologisches Observatorium Davos, World Radiation Center, Davos Dorf, Switzerland The quality assurance of the two Brewer spectrophotometers of the Finnish Meteorological Institute is discussed in this paper. The complete data processing chain from raw signal to high quality spectra is presented. The quality assurance includes daily maintenance, laboratory characterizations, calculation of long-term spectral responsivity, data processing and quality assessment. The cosine correction of the measurements is based on a new method, and is included in the data processing software. The results showed that the actual cosine correction factor of the two Finnish Brewers can vary between 1.08–1.13 and 1.08–1.12, respectively, depending on the sky radiance distribution and wavelength. The temperature characterization showed a linear temperature dependence between the instruments' internal temperature and the photon counts per cycle, and a temperature correction was used for correcting the measurements. The long-term spectral responsivity was calculated using the time series of several lamps using two slightly different methods. The long-term spectral responsivity was scaled to the irradiance scale of the Helsinki University of Technology (HUT) for the whole of the measurement time-periods 1990–2006 and 1995–2006 for Sodankylä and Jokioinen, respectively. Both Brewers have participated in many international spectroradiometer comparisons, and have shown good stability. The differences between the Brewers and the portable reference spectroradiometer QASUME have been within 5% during 2002–2007. Aaltonen, V., Lihavainen, H., Kerminen, V.-M., Ginzburg, M., Kulmala, M., and Viisanen, Y.: Three years of AOD measurements at three bipolar sites, in: NOSA 2006 Aerosol symposium, combined with the X Finnish National Aerosol Symposium, Finnish-Czech Aerosol Symposium, and BACCI workshop, Helsinki 8.–10.11.2006, Report Series in Aerosol Science, 83, 17–20, 2006. 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