Abstract
Abstract. 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 Monitoring Instrument (OMI) (with two different algorithms, Total Ozone Mapping Spectrometer (TOMS) TOMS and differential optical absorption spectroscopy (DOAS) methods), over the 2-year period between March 2012 and March 2014 at Yonsei University, Seoul, Korea. Based on the linear-regression method, the TCO from Pandora is closely correlated with those from other instruments with regression coefficients (slopes) of 0.95 (Dobson), 1.00 (Brewer), 0.98 (OMI-TOMS), and 0.97 (OMI-DOAS), and determination coefficients (R2) of 0.95 (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 Dobson measurements in particular, the difference caused by the inconsistency in observation times when compared with the Pandora measurements was up to 12.5 % because of diurnal variations in the TCO values. However, the comparison with Brewer after matching the observation time shows agreement with large R2 and small biases. The TCO ratio between Brewer and Pandora shows the 0.98 ± 0.03, and the distributions for relative differences between two instruments are 89.2 and 57.1 % of the total data within the error ranges of 3 and 5 %, respectively. The TCO ratio between Brewer and Pandora also is partially dependent on solar zenith angle. The error dependence by the observation geometry is essential to the further analysis focusing on the sensitivity of aerosol and the stray-light effect in the instruments.
Highlights
90 % of total column ozone (TCO) is found in the stratosphere, and its density peak occurs at altitudes between 20 and 30 km (Liou, 2002; Schott, 2007)
The largest annual range is found in the DBS (101.7 DU), whereas the smallest range is in the BRE (81.3 DU)
Daily total ozone data measured by the Pandora spectrophotometer were compared using ground-based and satellite measurements (DBS, BRE, and Ozone Monitoring Instrument (OMI)) over a 2-year period at Yonsei University, Seoul, Korea
Summary
90 % of total column ozone (TCO) is found in the stratosphere, and its density peak occurs at altitudes between 20 and 30 km (Liou, 2002; Schott, 2007). For the satellite-based observations, long-term, global datasets have been provided with high accuracy by the Total Ozone Mapping Spectrometer (TOMS) since 1979 (Bhartia and Wellemeyer, 2002), succeeding the Solar Backscattered Ultraviolet (SBUV) and SBUV2, Global Ozone Monitoring Experiment (GOME), Scanning Imaging Absorption Spectrometer for Atmospheric chartography (SCIAMACHY), and Ozone Monitoring Instrument (OMI) (Levelt et al, 2006). These data have been validated globally over long periods and have been widely used in numerous studies (e.g., Balis et al, 2007; McPeters et al, 2008; WMO, 2014).
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