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First total ozone column observations from the Ozone Monitoring Suite-Nadir (OMS-N) onboard China’s FengYun-3F satellite - Science China Earth Sciences

The Ozone Monitoring Suite-Nadir (OMS-N), a state-of-the-art hyperspectral ultraviolet-visible (UV-VIS) sensor onboard China’s FengYun-3F (FY-3F) satellite, was launched in August 2023. Designed for a morning orbit, OMS-N represents a significant advancement in global atmospheric composition monitoring, offering an unprecedented spatial resolution of 7 km×7 km. The total ozone column (TOC) product derived from OMS-N is critical for climate modeling and UV radiation assessment. This study presents the first TOC retrievals from OMS-N, utilizing an adapted Differential Optical Absorption Spectroscopy (DOAS) algorithm. The retrieval algorithm overcomes traditional DOAS limitations by incorporating key innovations, including optimized radiative transfer calculations and refined a priori information on surface properties and ozone profiles, which are derived directly from OMS-N spectra rather than relying on external datasets or climatologies. Validation against ground-based measurements from Brewer, Dobson, and SAOZ instruments at 33 sites demonstrated strong agreement, with correlation coefficients mostly greater than 0.9. Comparisons with other well-established satellite instruments, including TROPOMI and GOME-2B, showed that OMS-N can consistently capture global seasonal ozone patterns, with biases typically within 2% across hemispheres and seasons. These results establish OMS-N as a reliable tool for high-resolution dynamic ozone monitoring, significantly enhancing our ability to address climate and environmental challenges.