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. During the 2019/2020 measurement campaign atHohenpeißenberg (Germany) and Davos (Switzerland) we compared thewell-established Dobson and Brewer spectrometers (single- and double-monochromator Brewer) with newer BTS array-spectroradiometer-based systemsin terms of total ozone column (TOC) determination. The aim of this study is to validate the BTS performance in a longer-term TOC analysis over more than 1 year with seasonal and weather influences. Two different BTS setups havebeen used – a fibre-coupled entrance optic version by PMOD/WRC calledKoherent and a diffusor optic version from Gigahertz Optik GmbH called BTS-Solar, which proved to be simpler in terms of calibration. Thearray-spectrometer-based BTS systems have been calibrated with traceabilityto NMI, and both versions of TOC retrievalalgorithms are based on spectral measurements in the range of 305 to 350 nm instead of single-wavelength or wavelength pair measurements as per Brewer or Dobson. The two BTS-based systems, however, used fundamentally different retrieval algorithms for the TOC assessment, whereby the retrievalof the BTS-Solar turned out to achieve significantly smaller seasonaldrifts. The intercomparison showed a difference of the BTS-Solar to Brewersof &lt; 0.1 % with an expanded standard deviation (k=2) of &lt; 1.5 % over the whole measurement campaign. Koherent showed a difference of 1.7 % with an expanded standard deviation (k=2) of 2.7 % mostly causedby a significant seasonal variation. To summarize, the BTS-Solar performedat the level of Brewers in the comparison in Hohenpeißenberg. The BTS-Solar showed very small dependence on the slant path column compared tothe double-monochromator Brewer and performed better than the single-monochromator Brewer. Koherent showed a strong seasonal variation in Davosdue to the sensitivity of its ozone retrieval algorithm to stratospherictemperature.

Total ozone column intercomparison of Brewers, Dobsons, and BTS-Solar at Hohenpeißenberg and Davos in 2019/2020