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<p>Investigation of the distribution, evolution, and interactions of atmospheric components on Mars is crucial for understanding its climate and environment. The Spectroscopy Spectrograph for the Investigation of Characteristics of the Atmosphere of Mars (SPICAM), an instrument on the Mars Express spacecraft launched by the European Space Agency, consists of an ultraviolet channel (118–320 nm) and a near-infrared channel (1000–1700 nm), which provides the most comprehensive vertical spectral dataset of the Martian atmosphere to date. This study analyzes the spectral data obtained from nadir observations of SPICAM’s infrared channel during its first operational Martian year (January 2004 to November 2005) on the basis of the spectral theory of O<sub>2</sub> molecular airglow and the radiative transfer mechanism of H<sub>2</sub>O in the atmosphere, retrieving the seasonal and global distributions of O<sub>2</sub>(a<sup>1</sup>Δ<sub>g</sub>) airglow intensity and H<sub>2</sub>O abundance. Results reveal a clear inverse correlation between O<sub>2</sub>(a<sup>1</sup>Δ<sub>g</sub>) airglow intensity and H<sub>2</sub>O abundance. This finding provides indirect evidence of an anticorrelation between O<sub>3</sub> and H<sub>2</sub>O, given that O<sub>2</sub>(a<sup>1</sup>Δ<sub>g</sub>) airglow serves as a tracer for O<sub>3</sub> photodissociation. This will contribute to a deeper understanding of Martian climatology, thereby further refining Martian photochemical models, and assisting in exploring the stability of the Martian atmosphere.</p>

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Correlation between Martian O2(a1Δg) airglow and water vapor based on SPICAM observations

  • 期刊论文

  • 发表日期：

    2025年6月20日

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  • Chuanhang Wu,
  • Yi Yu,
  • Daoqi Wang,
  • Zhihua Wang,
  • Jiarui Su,
  • Kuijun Wu,
  • Faquan Li,
  • Weiwei He

摘要

Investigation of the distribution, evolution, and interactions of atmospheric components on Mars is crucial for understanding its climate and environment. The Spectroscopy Spectrograph for the Investigation of Characteristics of the Atmosphere of Mars (SPICAM), an instrument on the Mars Express spacecraft launched by the European Space Agency, consists of an ultraviolet channel (118–320 nm) and a near-infrared channel (1000–1700 nm), which provides the most comprehensive vertical spectral dataset of the Martian atmosphere to date. This study analyzes the spectral data obtained from nadir observations of SPICAM’s infrared channel during its first operational Martian year (January 2004 to November 2005) on the basis of the spectral theory of O2 molecular airglow and the radiative transfer mechanism of H2O in the atmosphere, retrieving the seasonal and global distributions of O2(a1Δg) airglow intensity and H2O abundance. Results reveal a clear inverse correlation between O2(a1Δg) airglow intensity and H2O abundance. This finding provides indirect evidence of an anticorrelation between O3 and H2O, given that O2(a1Δg) airglow serves as a tracer for O3 photodissociation. This will contribute to a deeper understanding of Martian climatology, thereby further refining Martian photochemical models, and assisting in exploring the stability of the Martian atmosphere.