Acoustics Reveals Short-Term Air Temperature Fluctuations Near Mars' Surface - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Geophysical Research Letters Année : 2022

Acoustics Reveals Short-Term Air Temperature Fluctuations Near Mars' Surface

Résumé

Acoustics is new on Mars: it allows the characterization of turbulence at smaller scales than previously possible within the lowest part of the Planetary Boundary Layer. Sound speed measurements, by the SuperCam instrument and its microphone onboard the NASA Perseverance rover, allow the retrieval of atmospheric temperatures at 0.77 m above the ground, at 3 Hz, with a ∼10 ms response time that is 20-100 times shorter than for typical thermocouple sensors used on Mars. Here we report on the first measurements of the sound speed-derived temperature and its fluctuations near the surface. Data highlight large and rapid fluctuations up to ±7 K/s, whose amplitude over such a timescale has never been reported, nor predicted by atmospheric models. These fluctuations follow the daytime pattern of the turbulence and highlight occasional high amplitude events that are likely due to the conjunction of low thermal inertia and strong winds.
Fichier principal
Vignette du fichier
Geophysical Research Letters - 2022 - Chide - Acoustics Reveals Short‐Term Air Temperature Fluctuations Near Mars Surface.pdf (1.85 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

insu-03993980 , version 1 (19-02-2023)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

Citer

Baptiste Chide, Tanguy Bertrand, Ralph D. Lorenz, Asier Munguira, Ricardo Hueso, et al.. Acoustics Reveals Short-Term Air Temperature Fluctuations Near Mars' Surface. Geophysical Research Letters, 2022, 49, ⟨10.1029/2022GL100333⟩. ⟨insu-03993980⟩
16 Consultations
18 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More