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

Brissaud, Quentin and Martin, Roland and Garcia, Raphaël F. and Komatitsch, Dimitri Finite-difference numerical modelling of gravito-acoustic wave propagation in a windy and attenuating atmosphere. (2016) Geophysical Journal International, 206 (1). 308-327. ISSN 0956-540X

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Official URL: http://dx.doi.org/10.1093/gji/ggw121

Abstract

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 3D 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 2D or 3D realistic cases such as tsunamis in a full MSISE- 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
Additional Information:Thanks to Oxford University Press (OUP) editor. The definitive version is available at http://global.oup.com/ The original PDF of the article can be found at Geophysical Journal International website : http://gji.oxfordjournals.org/content/206/1/308
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Aix-Marseille Université - AMU (FRANCE)
French research institutions > Centre National d'Études Spatiales - CNES (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
French research institutions > Institut de Recherche pour le Développement - IRD (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université de Provence - Aix-Marseille I (FRANCE)
Other partners > Ecole Centrale Marseille (FRANCE)
Other partners > Université de la Méditerranée - Aix-Marseille II (FRANCE)
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Deposited By: Raphael Garcia
Deposited On:26 Aug 2016 09:08

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