Chinese Journal of Polar Research

Chinese Journal of Polar Research ›› 2026, Vol. 38 ›› Issue (3): 342-354.DOI: 10.13679/j.jdyj.20240104

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Verification of the FY-3C/TOU total ozone column product in Antarctica

ZHAO Yixi1,2, TIAN Biao1,3, ZHENG Xiangdong1, YANG Diyi4, ZOU Xiaowei5, YU Yining1, WANG Xin1, DING Minghu1,6   

  1. 1State Key Laboratory of Disaster Weather Science and Technology, Chinese Academy of Meteorological Sciences, Beijing 100081, China;
    2College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 101408, China;
    3School of Earth and Space Sciences, Peking University, Beijing 100871, China;
    4Haining Meteorological Bureau, Jiaxing 314400, China;
    5School of Geodesy and Geomatics, Wuhan University, Wuhan 430072, China;
    6Key Laboratory of Polar Atmosphere-ocean-ice System for Weather and Climate, Ministry of Education, Fudan University, Shanghai 200438, China
  • Received:2024-12-30 Revised:2025-05-27 Online:2026-09-30 Published:2026-10-22

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Abstract:

Owing to anomalies in the solar irradiance measurements of the FY-3C/TOU (Total Ozone Unit), the applicability of its total ozone column (TOC) products in Antarctica remains to be evaluated. This study evaluated the accuracy of FY-3C/TOU TOC products in combination with ground-based measurements at six Antarctic stations from January 2015 to December 2019 and compared them with Aura/OMI (Ozone Monitoring Instrument) TOC products. The factors influencing the relative differences in TOU TOC were investigated, existing problems analyzed, and a correction method proposed. Results showed that TOU TOC exhibits substantial underestimation during November–January, with relative differences ranging from −37.19% to −21.19% at Zhongshan (ZOS), Syowa (SYO), Marambio (MBI), and Dumont d’Urville (DDU) stations. In contrast, deviation metrics at the Halley (HBA) and South Pole (SPO) stations were relatively small throughout the year, with correlation coefficients above 0.940. The relative difference in OMI TOC at each station ranged from −3% to 2%, making it a reliable reference for evaluating the accuracy of TOU TOC products. The influence of the solar zenith angle (SZA) on the relative difference in TOU TOC was identified mainly when the SZA is below 70°. The influence of ground-based TOC on the relative difference in TOU TOC exhibited a W-type pattern at the ZOS, SYO, and DDU stations, with low points occurring in the ranges of 190~250 and 310~340 DU. No notable trends were observed for radiative cloud fraction and aerosol index. Based on the K-fold cross-validation method, a time-segmented linear correction method is proposed for TOU TOC, which improves the correlation coefficients to above 0.874. This study clarified the monitoring capability of FY-3C/TOU in the Antarctic region, identified current problems, and proposed an effective correction strategy.


Key words: FY-3C/TOU, Aura/OMI, Antarctic total ozone column, accuracy verification, linear correction