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Finite-Difference Modeling of Acoustic and Gravity Wave Propagation in Mars Atmosphere: Application to Infrasounds Emitted by Meteor Impacts

Garcia, Raphael F. and Brissaud, Quentin and Rolland, Lucie and Martin, Roland and Komatitsch, Dimitri and Spiga, Aymeric and Lognonné, Philippe and Banerdt, Bruce (2017) Finite-Difference Modeling of Acoustic and Gravity Wave Propagation in Mars Atmosphere: Application to Infrasounds Emitted by Meteor Impacts. Space Science Reviews, 211 (1-4). pp. 547-570. ISSN 0038-6308. http://resolver.caltech.edu/CaltechAUTHORS:20180803-115952321

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Abstract

The propagation of acoustic and gravity waves in planetary atmospheres is strongly dependent on both wind conditions and attenuation properties. This study presents a finite-difference modeling tool tailored for acoustic-gravity wave applications that takes into account the effect of background winds, attenuation phenomena (including relaxation effects specific to carbon dioxide atmospheres) and wave amplification by exponential density decrease with height. The simulation tool is implemented in 2D Cartesian coordinates and first validated by comparison with analytical solutions for benchmark problems. It is then applied to surface explosions simulating meteor impacts on Mars in various Martian atmospheric conditions inferred from global climate models. The acoustic wave travel times are validated by comparison with 2D ray tracing in a windy atmosphere. Our simulations predict that acoustic waves generated by impacts can refract back to the surface on wind ducts at high altitude. In addition, due to the strong nighttime near-surface temperature gradient on Mars, the acoustic waves are trapped in a waveguide close to the surface, which allows a night-side detection of impacts at large distances in Mars plains. Such theoretical predictions are directly applicable to future measurements by the INSIGHT NASA Discovery mission.


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https://doi.org/10.1007/s11214-016-0324-6DOIArticle
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ORCID:
AuthorORCID
Garcia, Raphael F.0000-0003-1460-6663
Additional Information:© Springer Science+Business Media Dordrecht 2016. Received: 8 June 2016 / Accepted: 24 November 2016 / Published online: 12 December 2016. We acknowledge Don Banfield and an anonymous reviewer for their detailed review of the manuscript. We thank the INSIGHT science team for fruitful discussions. We also thank the “Région Midi-Pyréenées” (France) and “Université fédérale de Toulouse” for funding the PhD grant of Quentin Brissaud. This study was also supported by CNES through space research scientific projects. Computer resources were provided by granted projects No. p1138 at CALMIP computing centre (Toulouse France), Nos. t2014046351 and t2015046351 at CEA centre (Bruyères, France). This is Insight Contribution Number 16.
Group:Keck Institute for Space Studies
Subject Keywords:Mars · InSight mission · Atmosphere · Acoustic waves · Gravity waves · Impacts · Pressure sensor · Numerical modeling
Record Number:CaltechAUTHORS:20180803-115952321
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180803-115952321
Official Citation:Garcia, R.F., Brissaud, Q., Rolland, L. et al. Space Sci Rev (2017) 211: 547. https://doi.org/10.1007/s11214-016-0324-6
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88571
Collection:CaltechAUTHORS
Deposited By: Iryna Chatila
Deposited On:03 Aug 2018 20:42
Last Modified:03 Aug 2018 20:42

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