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Probing the Martian atmospheric boundary layer using impact-generated seismo-acoustic signals
  • +7
  • Marouchka Froment,
  • Zongbo Xu,
  • Philippe Lognonné,
  • Carene Larmat,
  • Raphael F. Garcia,
  • Melanie Drilleau,
  • Brent G. Delbridge,
  • Aymeric Spiga,
  • Taichi Kawamura,
  • Eric Beucler
Marouchka Froment
Université Paris Cité, Institut de Physique du Globe de Paris

Corresponding Author:[email protected]

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Zongbo Xu
Universite Paris Cite, Institut de Physique du Globe de Paris
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Philippe Lognonné
Université Paris Cité, Institute de physique de globe de Paris, CNRS
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Carene Larmat
Los Alamos National Laboratory (DOE)
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Raphael F. Garcia
Institut Supérieur de l'Aéronautique et de l'Espace, ISAE-SUPAERO
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Melanie Drilleau
Institut Supérieur de l'Aéronautique et de l'Espace ISAE-SUPAERO
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Brent G. Delbridge
Los Alamos National Laboratory
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Aymeric Spiga
Laboratoire de Météorologie Dynamique/Institut Pierre-Simon Laplace (LMD/IPSL),CNRS,Sorbonne Université
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Taichi Kawamura
Université Paris Cité, Institut de physique du globe de Paris, CNRS
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Eric Beucler
Laboratoire de Planétologie et de Géodynamique, Nantes University
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Abstract

The properties of the first kilometers of the Martian atmospheric Planetary Boundary Layer have until now been measured by only a few instruments and probes. InSight offers an opportunity to investigate this region through seismoacoustics. On six occasions, its seismometers recorded short low-frequency waveforms, with clear dispersion between 0.4 and 4Hz. These signals are the air-to-ground coupling of impact-generated infrasound, which propagated in an low-altitude atmospheric waveguide. Their group velocity depends on the structure of effective sound speed in the boundary layer. Here, we conduct a Bayesian inversion of effective sound speed up to 2000m altitude using the group velocity measured for events S0981c, S0986c and S1034a. The inverted effective sound speed profiles are in good agreement with estimates provided by the Mars Climate Database. Differences between inverted and modeled profiles can be attributed to a local wind variation in the impact → station direction, of amplitude smaller than 2m/s.
17 Apr 2024Submitted to ESS Open Archive
19 Apr 2024Published in ESS Open Archive