Articles | Volume 10, issue 10
Atmos. Meas. Tech., 10, 3661–3676, 2017
Atmos. Meas. Tech., 10, 3661–3676, 2017

Research article 06 Oct 2017

Research article | 06 Oct 2017

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

Jiyoung Kim1, Jhoon Kim1, Hi-Ku Cho1, Jay Herman2,3, Sang Seo Park1,4, Hyun Kwang Lim1, Jae-Hwan Kim5, Koji Miyagawa6,7, and Yun Gon Lee8 Jiyoung Kim et al.
  • 1Department of Atmospheric Sciences, Yonsei University, Seoul, South Korea
  • 2Joint Center for Earth Systems Technology, University of Maryland, Baltimore, MD 20771, USA
  • 3NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
  • 4School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea
  • 5Department of Atmospheric Science, Pusan National University, Busan, South Korea
  • 6Science & Technology Corp, Hampton, VA 23666-1393, USA
  • 7NOAA/ESRL, Global Monitoring Division, Boulder, CO 80305, USA
  • 8Department of Atmospheric Sciences, Chungnam National University, Daejeon, South Korea

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.

Short summary
Total column ozone (TCO) has been obtained by various ground-based and spaceborne instruments (OMI) with high accuracy. Here, daily TCO measured by a Pandora spectrophotometer (no. 19) installed since the (DRAGON)-NE Asia campaign (2012) was intercompared using Dobson (no. 124), Brewer (no. 148), and OMI measurements from March 2012 to March 2014 at Yonsei University, Seoul, Korea. The results showed that Pandora TCO is in very good agreement with other measurements.