Detection of Mesospheric CO<sub>2</sub> Ice Clouds on Mars in Southern Summer - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Geophysical Research Letters Year : 2019

Detection of Mesospheric CO2 Ice Clouds on Mars in Southern Summer


This paper reports the first detections of two high‐altitude nighttime CO2 clouds on Mars during southern summer (Ls = 264° and Ls = 330°) with stellar occultation measurements by the Imaging Ultraviolet Spectrograph on board the Mars Atmosphere and Volatile Evolution spacecraft. Interpretation of the transmission spectra with Mie theory indicates particle radii of ~90‐110 nm assuming a mono‐disperse distribution. The altitude profile of extinction indicates that the cloud layers are confined horizontally to sizes less than ~ 500‐700~km. Examination of the CO2 density and temperature profiles reveals strong wave‐like perturbations. Supersaturated temperatures occur at the maximum negative extent of these wave‐like perturbations, which are organized in longitude with a dominant m=3 zonal harmonic. This suggests that tides are important in the formation of CO2 clouds.
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insu-02182518 , version 1 (13-01-2021)



F. Y. Jiang, Roger Yelle, S. K. Jain, J. Cui, Franck Montmessin, et al.. Detection of Mesospheric CO2 Ice Clouds on Mars in Southern Summer. Geophysical Research Letters, 2019, 46 (14), pp.7962-7971. ⟨10.1029/2019GL082029⟩. ⟨insu-02182518⟩
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