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Total ozone column retrieval from EMI-II: validation and regional analysis over the Yangtze River Basin
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DOI：10.1080/01431161.2026.2695947.png)
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Abstract
En 中文
The Environmental Trace Gases Monitoring Instrument-II (EMI-II) onboard the Gaofen-5B satellite provides high-resolution hyperspectral measurements in the ultraviolet range, enabling the retrieval of total ozone column (TOC) at regional to global scales. In this study, an optimized TOC retrieval algorithm for EMI-II is developed and comprehensively evaluated over the Yangtze River Basin. The algorithm integrates several improvements, including a refined spectral calibration with pseudo-absorption cross sections to correct wavelength shifts and stretches, and a region-specific air mass factor (AMF) look-up table generated using the SCIATRAN radiative transfer model. Validation against ground-based Brewer and Dobson spectrophotometer data from the World Ozone and Ultraviolet Radiation Data Centre (WOUDC) shows that the optimized retrieval achieves a correlation coefficient exceeding 0.9 and a mean bias within ±5%. Cross-comparisons with the TROPOspheric Monitoring Instrument (TROPOMI) and Geostationary Environment Monitoring Spectrometer (GEMS) products further demonstrate the reliability and consistency of the EMI-II retrievals. The results confirm that EMI-II provides accurate and stable TOC measurements across diverse surface and atmospheric conditions in China. This study establishes a validated retrieval framework that enhances the scientific application potential of Chinese environmental satellites for atmospheric monitoring and supports the development of future ozone observation missions.
Keywords:
Gaofen-5
Environmental Trace Gases Monitoring Instrument-II (EMI-II)
total ozone column
differential absorption spectroscopy
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2.6
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1.2W
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2.7W
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