Investigation of the 2018 Global Dust Event from ACS-TIRVIM on board ExoMars/TGO

Sandrine Guerlet (1) , Roland Young (1) , Nikolay I. Ignatiev (2) , François Forget (1) , Ehouarn Millour (1) , Thierry Fouchet (3, 4) , Luca Montabone (1, 5) , Alexey V. Shakun (2) , Alexey Grigoriev (2) , Alexander Trokhimovskiy (2) , Franck Montmessin (6) , Oleg Korablev (2)

1 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
2 IKI - Space Research Institute of the Russian Academy of Sciences
3 Pôle Planétologie du LESIA
4 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics
5 SSI - Space Science Institute [Boulder]
6 PLANETO - LATMOS

We report on the analysis of thermal infrared emission spectra recordedby ACS-TIRVIM on board the ExoMars Trace Gas Orbiter (TGO). We focus onthe period 13 March 2018 till 15 July 2018, covering quiescent and dustyconditions. From these observations, we retrieve temperature verticalprofiles from 5 to 45 km as well as integrated dust and water iceopacity at various local times. The retrieved temperature profiles arein excellent agreement with co-located observations by Mars ClimateSounder, a limb-viewing radiometer onboard Mars Reconnaissance Orbiter.The global dust event resulted in an up to 40K temperature increase inthe middle atmosphere. We will discuss these results compared to GlobalClimate Model (GCM) simulations run with MY34 dust scenario. We willalso present and discuss the atmospheric state resulting from theassimilation of TIRVIM temperature profiles into the LMD Mars GCM.

Domaines: Astrophysique [astro-ph]; Planète et Univers [physics]

Sandrine Guerlet, Roland Young, Nikolay I. Ignatiev, François Forget, Ehouarn Millour, et al.. Investigation of the 2018 Global Dust Event from ACS-TIRVIM on board ExoMars/TGO. EPSC-DPS Joint Meeting 2019, Sep 2019, Geneva, Switzerland. pp.EPSC-DPS2019-776. ⟨hal-03802484⟩