Migrating Thermal Tides in the Martian Atmosphere During Aphelion Season Observed by EMM/EMIRS

Siteng Fan (1) , François Forget (1) , Michael D. Smith , Sandrine Guerlet (1) , Khalid M. Badri , Samuel A. Atwood , Roland M. B. Young , Christopher S. Edwards , Philip R. Christensen , Justin Deighan , Hessa R. Al Matroushi , Antoine Bierjon (1) , Jiandong Liu (1) , Ehouarn Millour (1)

1 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)

Temperature profiles retrieved using the first set of data of the Emirates Mars InfraRed Spectrometer obtained during the science phase of the Emirates Mars Mission are used for the analysis of migrating thermal tides in the Martian atmosphere. The selected data cover a solar longitude (L_S) range of 60°-90° of Martian Year 36. The novel orbit design of the Hope Probe leads to a good geographic and local time coverage that significantly improves the analysis. Wave mode decomposition suggests dominant diurnal tide and important semi-diurnal tide with maximal amplitudes of 6 and 2 K, respectively, as well as the existence of ∼0.5 K ter-diurnal tide. The results agree well with predictions by the Mars Planetary Climate Model, but the observed diurnal tide has an earlier phase (3 hr), and the semi-diurnal tide has an unexpectedly large wavelength (∼200 km).

Mots clés: Martian atmosphere; thermal tide; Emirates Mars Mission; Emirates Mars Infrared Spectrometer; atmospheric wave; Astrophysics - Earth and Planetary Astrophysics

Domaines: Planète et Univers [physics]

Siteng Fan, François Forget, Michael D. Smith, Sandrine Guerlet, Khalid M. Badri, et al.. Migrating Thermal Tides in the Martian Atmosphere During Aphelion Season Observed by EMM/EMIRS. Geophysical Research Letters, 2022, 49, ⟨10.1029/2022GL099494⟩. ⟨insu-03847099⟩