China's First Infrared Occultation Spectrometer (GaoFen-5/AIUS) Monitoring Atmosphere Above Antarctic: Evaluation of Methane Profiles
The atmospheric infrared ultraspectral sounder (AIUS) is China's first infrared occultation spectrometer onboard the GaoFen-5 satellite. This instrument provides measurements in the near-infrared and mid-infrared spectral regions with a spectral resolution of 0.02 cm<inline-formula>...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2024-01-01
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| Series: | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/10479977/ |
| Summary: | The atmospheric infrared ultraspectral sounder (AIUS) is China's first infrared occultation spectrometer onboard the GaoFen-5 satellite. This instrument provides measurements in the near-infrared and mid-infrared spectral regions with a spectral resolution of 0.02 cm<inline-formula><tex-math notation="LaTeX">$^{-1}$</tex-math></inline-formula>, monitoring key greenhouse gases like methane (CH<inline-formula><tex-math notation="LaTeX">$_{4}$</tex-math></inline-formula>). In this study, we have developed a physics-based retrieval algorithm for accurately deriving CH<inline-formula><tex-math notation="LaTeX">$_{4}$</tex-math></inline-formula> mole fraction profiles from infrared absorption spectra. The retrieval algorithm is applied to the AIUS and successfully obtains CH<inline-formula><tex-math notation="LaTeX">$_{4}$</tex-math></inline-formula> mole fraction profiles from January to December 2019 over Antarctic. The validation results show that the retrieval algorithm has a satisfactory performance using AIUS measurements, with average relative standard deviation of the differences less than 7.2% throughout the altitude range of 10–70 km. |
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| ISSN: | 1939-1404 2151-1535 |