HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Martian water ice clouds during the 2018 global dust storm as observed by the ACS-MIR channel onboard the Trace Gas Orbiter

Abstract : The Atmospheric Chemistry Suite (ACS) instrument onboard the ExoMars Trace Gas Orbiter (TGO) ESA-Roscosmos mission began science operations in March 2018. ACS Mid InfraRed (MIR) channel notably provides solar occultation observations of the martian atmosphere in the 2.3 – 4.2 μm spectral range. Here we use these observations to characterize water ice clouds before and during the MY 34 Global Dust Storm (GDS). We developed a method to detect water ice clouds with mean particle size ≤ 2 μm, and applied it to observations gathered between Ls = 165◦ and Ls = 243◦. We observe a shift in water ice clouds maximum altitudes from about 60 km before the GDS to above 90 km during the storm. These very high altitude, small-sized (reff ≤ 0.3 μm) water ice clouds are more frequent during MY34 compared to non- GDS years at the same season. Particle size frequently decreases with altitude, both locally within a given profile and globally in the whole dataset. We observe that the maximum altitude at which a given size is observed can increase during the GDS by several tens of km for certain sizes. We notably notice some large water ice particles (reff ≥ 1.5 μm) at surprisingly high altitudes during the GDS (50 – 70 km). These results suggest that GDS can significantly impact the formation and properties of high altitude water ice clouds as compared to the usual perihelion dust activity.
Document type :
Journal articles
Complete list of metadata

Contributor : Catherine Cardon Connect in order to contact the contributor
Submitted on : Saturday, December 12, 2020 - 5:54:09 PM
Last modification on : Thursday, January 13, 2022 - 3:54:02 PM
Long-term archiving on: : Saturday, March 13, 2021 - 7:31:43 PM


Files produced by the author(s)



Aurélien Stcherbinine, M. Vincendon, Franck Montmessin, M. J. Wolff, Oleg Korablev, et al.. Martian water ice clouds during the 2018 global dust storm as observed by the ACS-MIR channel onboard the Trace Gas Orbiter. Journal of Geophysical Research. Planets, Wiley-Blackwell, 2020, 125 (3), pp.e2019JE006300. ⟨10.1029/2019JE006300⟩. ⟨insu-02492315⟩



Record views


Files downloads