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Finite-difference numerical modelling of gravitoacoustic wave propagation in a windy and attenuating atmosphere

Brissaud, Quentin and Martin, Roland and Garcia, Raphael F. and Komatitsch, Dimitri (2016) Finite-difference numerical modelling of gravitoacoustic wave propagation in a windy and attenuating atmosphere. Geophysical Journal International, 206 (1). pp. 308-327. ISSN 0956-540X. doi:10.1093/gji/ggw121.

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Acoustic and gravity waves propagating in planetary atmospheres have been studied intensively as markers of specific phenomena such as tectonic events or explosions or as contributors to atmosphere dynamics. To get a better understanding of the physics behind these dynamic processes, both acoustic and gravity waves propagation should be modelled in a 3-D attenuating and windy atmosphere extending from the ground to the upper thermosphere. Thus, in order to provide an efficient numerical tool at the regional or global scale, we introduce a finite difference in the time domain (FDTD) approach that relies on the linearized compressible Navier–Stokes equations with a background flow (wind). One significant benefit of such a method is its versatility because it handles both acoustic and gravity waves in the same simulation, which enables one to observe interactions between them. Simulations can be performed for 2-D or 3-D realistic cases such as tsunamis in a full MSISE-00 atmosphere or gravity-wave generation by atmospheric explosions. We validate the computations by comparing them to analytical solutions based on dispersion relations in specific benchmark cases: an atmospheric explosion, and a ground displacement forcing.

Item Type:Article
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Brissaud, Quentin0000-0001-8189-4699
Garcia, Raphael F.0000-0003-1460-6663
Additional Information:© The Authors 2016. Published by Oxford University Press on behalf of The Royal Astronomical Society. Accepted 2016 March 30. Received 2016 March 30; in original form 2015 October 27. The authors thank Bruno Voisin for discussion about his work (Voisin 1994) and for giving them more details on the pressure response of an explosion in a moving medium. They are also grateful to Bernard Valette for mathematical discussion about the Euler equations. We acknowledge two anonymous reviewers for their constructive reviews improving this study. 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 work was also granted access to the French HPC resources of TGCC under allocations t2015-gen6351 and 2015-gen7165 made by GENCI. They also thank the ‘Région Midi-Pyrénées’ (France) and ‘Université de Toulouse’ for funding the PhD grant of Quentin Brissaud. This study was also supported by CNES/TOSCA through space research scientific projects.
Group:Keck Institute for Space Studies
Subject Keywords:Numerical solutions, Acoustic-gravity waves, Tsunamis, Earthquake ground motions, Computational seismology, Wave propagation
Issue or Number:1
Record Number:CaltechAUTHORS:20180803-110017988
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Official Citation:Quentin Brissaud, Roland Martin, Raphaël F. Garcia, Dimitri Komatitsch; Finite-difference numerical modelling of gravitoacoustic wave propagation in a windy and attenuating atmosphere, Geophysical Journal International, Volume 206, Issue 1, 1 July 2016, Pages 308–327,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88570
Deposited By: Iryna Chatila
Deposited On:03 Aug 2018 20:48
Last Modified:16 Nov 2021 00:28

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