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

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Title
Intercomparison of total column ozone data from the Pandora spectrophotometer with Dobson, Brewer, and OMI measurements over Seoul, Korea
Author
Kim, JiyoungKim, JhoonCho, Hi-KuHerman, JayPark, Sang SeoLim, Hyun KwangKim, Jae-HwanMiyagawa, KojiLee, Yun Gon
Issue Date
2017-10
Publisher
COPERNICUS GESELLSCHAFT MBH
Citation
ATMOSPHERIC MEASUREMENT TECHNIQUES, v.10, no.10, pp.3661 - 3676
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 R-2 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.
URI
https://scholarworks.unist.ac.kr/handle/201301/27355
URL
https://www.atmos-meas-tech.net/10/3661/2017/
DOI
10.5194/amt-10-3661-2017
ISSN
1867-1381
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