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. Three reference Dobsons (regional standard Dobsons No. 064, Germany and No. 074, CzechRepublic as well as the world standard No. 083, USA) were opticallycharacterized at the Physikalisch-Technische Bundesanstalt (PTB) inBraunschweig in 2015 and at the Czech Metrology Institute (CMI) in Prague in2016 within the EMRP ENV 059 project “Traceability for atmospheric totalcolumn ozone”. Slit functions and the related parameters of the instrumentswere measured and compared with G. M. B. Dobson's specifications in hishandbook. All Dobsons show a predominantly good match of the slit functionsand the peak (centroid) wavelengths with deviations between − 0.11 and + 0.12 nm and differences of the full width half maximum (FWHM) between0.13 and 0.37 nm compared to the nominal values at the shorter wavelengths.Slightly larger deviations of the FWHMs from the nominal Dobson data, up to1.22 nm, can be seen at the longer wavelengths, especially for the slitfunction of the long D-wavelength. However, differences between the effectiveabsorption coefficients (EACs) for ozone derived using Dobson's nominalvalues of the optical parameters on one hand and these measured values on theother hand are not too large in the case of both “old” Bass–Paur (BP) and“new” IUP-ozone (Institut fur Umweltphysik, University of Bremen) absorption cross sections.Their inclusion in the calculation of the total ozone column (TOC) leads toimprovements of significantly less than ± 1 % at theAD-wavelengths between − 1 and − 2 %at the CD-wavelengths pairs in the BP-scale. Theeffect on the TOC in the IUP-scale is somewhat larger at the AD-wavelengths,up to + 1 % (D074), and smaller at the CD-wavelengths pair, from − 0.44to − 1.5 %. Beside this positive effect gained from the data with highermetrological quality that is needed for trend analyses and satellitevalidation, it will be also possible to explain uncommon behaviours of fieldDobsons during calibration services, especially when a newly developedtransportable device TuPS (tuneable portable radiation source) from CMI proves itscapability to provide similar results as the stationary setups in thelaboratories of National Metrology Institutes. Then, the field Dobsons can beoptically characterized as well during regular calibration campaigns. Acorresponding publication will be prepared using the results of TuPS-basedmeasurements of more than 10 Dobsons in field campaigns in 2017.

Optical characterisation of three reference Dobsons in the ATMOZ Project – verification of G. M. B. Dobson's original specifications