Analysis of the discrepancy between ground-based and satellite total ozone content measurements at Kyiv-Goloseyev station

1Grytsai, AV, 2Milinevsky, GP
1Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
2Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
Kosm. nauka tehnol. 2014, 20 ;(1):03-13
Publication Language: Ukrainian

We compared satellite and ground-based total ozone measurements at the Kyiv-Goloseyev station. Some data of the Ozone Monitoring Instrument and Scanning Imaging Absorption Spectrometer for Chartography satellite instruments were used. The ground-based observations were carried out with the Dobson spectrophotometer N 040. The period from the measurement beginning (13 May 2010) at the Kyiv-Goloseyev station to the end of 2012 was considered. An estimation for ground-based observations of different types was performed through their comparison with satellite data. The "Direct Sun" ground-based measurements were shown to be the most reliable ones. Moreover, it is essential to note a high quality of Zenith Blue ground-based observations. Their quality was at least comparable with one for the "Direct Sun" measurements. The Dobson total ozone content (TOC) values were revealed to be lower than the satellite values while solar zenith angle is greater than 60°. The main cause of this discrepancy is probably a TOC underestimate by the Dobson spectrophotometer due to radiation scattered within the instrument. The differences between satellite and ground-based data display seasonal changes with the maximum in winter and minimum in summer. This points to some limits of the TOC calculation algorithm.

Keywords: satellite data, the Dobson spectrophotometer, total ozone content

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