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A comparison of retrieved total column ozone (TCO) amounts between the Pandora#34 spectrometer system and the Dobson #061 spectrophotometer fromdirect-sun observations was performed on the roof of the Boulder, Colorado,NOAA building. This paper, part of an ongoing study, covers a 1-yearperiod starting on 17 December 2013. Both the standard Dobson and PandoraTCO retrievals required a correction, TCOcorr = TCO(1 + C(T)), using a monthly varying effective ozone temperature,TE,derived from a temperature and ozone profile climatology. The correction isused to remove a seasonal difference caused by using a fixed temperature ineach retrieval algorithm. The respective corrections C(TE) areCPandora = 0.00333(TE-225) and CDobson= -0.0013(TE-226.7) per degree K. After the applied corrections removedmost of the seasonal retrieval dependence on ozone temperature, TCOagreement between the instruments was within 1 % for clear-sky conditions.For clear-sky observations, both co-located instruments tracked theday-to-day variation in total column ozone amounts with a correlation ofr2 = 0.97 and an average offset of 1.1 ± 5.8 DU. In addition,the Pandora TCO data showed 0.3 % annual average agreement with satelliteoverpass data from AURA/OMI (Ozone Monitoring Instrument) and 1 % annualaverage offset with Suomi-NPP/OMPS (Suomi National Polar-orbitingPartnership, the nadir viewing portion of the Ozone Mapper Profiler Suite)

Comparison of ozone retrievals from the Pandora spectrometer system and Dobson spectrophotometer in Boulder, Colorado