Journal articles
Detection of Mesospheric CO2 Ice Clouds on Mars in Southern Summer
Abstract : 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.
https://hal-insu.archives-ouvertes.fr/insu-02182518
Contributor : Catherine Cardon <>
Submitted on : Wednesday, January 13, 2021 - 8:45:57 PM
Last modification on : Wednesday, April 14, 2021 - 3:39:12 AM
Contributor : Catherine Cardon <>
Submitted on : Wednesday, January 13, 2021 - 8:45:57 PM
Last modification on : Wednesday, April 14, 2021 - 3:39:12 AM
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