Multi-scale waves in sound-proof global simulations with EULAG

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dc.contributor.author Prusa, Joseph
dc.contributor.author Gutowski, William
dc.contributor.author Gutowski, William
dc.contributor.department Geological and Atmospheric Sciences
dc.date 2018-02-18T00:35:01.000
dc.date.accessioned 2020-06-30T04:03:14Z
dc.date.available 2020-06-30T04:03:14Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 2012
dc.date.issued 2011-12-01
dc.description.abstract <p>EULAG is a computational model for simulating flows across a wide range of scales and physical scenarios. A standard option employs an anelastic approximation to capture nonhydrostatic effects and simultaneously filter sound waves from the solution. In this study, we examine a localized gravity wave packet generated by instabilities in Held-Suarez climates. Although still simplified versus the Earth’s atmosphere, a rich set of planetary wave instabilities and ensuing radiated gravity waves can arise. Wave packets are observed that have lifetimes ≤ 2 days, are negligibly impacted by Coriolis force, and do not show the rotational effects of differential jet advection typical of inertia-gravity waves. Linear modal analysis shows that wavelength, period, and phase speed fit the dispersion equation to within a mean difference of ∼ 4%, suggesting an excellent fit. However, the group velocities match poorly even though a propagation of uncertainty analysis indicates that they should be predicted as well as the phase velocities. Theoretical arguments suggest the discrepancy is due to nonlinearity — a strong southerly flow leads to a critical surface forming to the southwest of the wave packet that prevents the expected propagation.</p>
dc.description.comments <p>This article is from Acta Geophysica. Volume 59, Issue 6, Pages 1135–1157, ISSN (Online) 1895-7455, ISSN (Print) 1895-6572, DOI: <a href="http://dx.doi.org/10.2478/s11600-011-0050-0">10.2478/s11600-011-0050-0</a>, October 2011 </p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/ge_at_pubs/127/
dc.identifier.articleid 1127
dc.identifier.contextkey 9349849
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ge_at_pubs/127
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/38056
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/ge_at_pubs/127/2011_Prusa_MultiScaleWaves.pdf|||Fri Jan 14 19:27:56 UTC 2022
dc.source.uri 10.2478/s11600-011-0050-0
dc.subject.disciplines Climate
dc.subject.keywords anelastic; gravity waves; baroclinic instability
dc.title Multi-scale waves in sound-proof global simulations with EULAG
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication a9f30fc3-02dd-4a1a-82e7-516c277638f5
relation.isOrgUnitOfPublication 29272786-4c4a-4d63-98d6-e7b6d6730c45
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