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Daily total column ozone (TCO) measured using the Pandora spectrophotometer(no. 19) was compared with data from the Dobson (no. 124) and Brewer(no. 148) spectrophotometers, as well as from the Ozone MonitoringInstrument (OMI) (with two different algorithms, TotalOzone Mapping Spectrometer (TOMS) TOMS and differential optical absorption spectroscopy (DOAS) methods),over the 2-year period between March 2012 and March 2014 at YonseiUniversity, Seoul, Korea. Based on the linear-regression method, the TCO from Pandorais closely correlated with those from other instrumentswith regression coefficients (slopes) of 0.95 (Dobson), 1.00 (Brewer),0.98 (OMI-TOMS), and 0.97 (OMI-DOAS), and determination coefficients (R2) of0.95 (Dobson), 0.97 (Brewer), 0.96 (OMI-TOMS), and 0.95 (OMI-DOAS).The daily averaged TCO from Pandora has within 3 %differences compared to TCO values from other instruments. For the Dobsonmeasurements in particular, the difference caused by the inconsistency inobservation times when compared with the Pandora measurements was up to12.5 % because of diurnal variations in the TCO values. However, thecomparison with Brewer after matching the observation time shows agreementwith large <i>R</i><sup>2</sup> and small biases. The TCO ratio between Brewer andPandora shows the 0.98 ± 0.03, and the distributions for relativedifferences between two instruments are 89.2 and 57.1 % of the totaldata within the error ranges of 3 and 5 %, respectively. The TCO ratiobetween Brewer and Pandora also is partially dependent on solar zenithangle. The error dependence by the observation geometry is essential to thefurther analysis focusing on the sensitivity of aerosol and the stray-lighteffect in the instruments

Intercomparison of total column ozone data from the Pandora spectrophotometer with Dobson, Brewer, and OMI measurements over Seoul, Korea