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A Nonlinear Baroclinic Wave-Mean Oscillation with Multiple Normal Mode Instabilities Public Deposited

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  • An unstable, nonlinear baroclinic wave-mean oscillation is found in a strongly supercritical quasigeostrophic f-plane numerical channel model with 3840 Fourier components. The growth of linear disturbances to this time-periodic oscillation is analyzed by computing time-dependent normal modes (Floquet vectors). Two different Newton–Picard methods are used to compute the unstable solution, the first based on direct computation of a large set of Floquet vectors, and the second based on an efficient iterative solver. Three different growing normal modes are found, which modify the wave structure of the wave-mean oscillation in two essentially different ways. The dynamics of the instabilities are qualitatively similar to the baroclinic dynamics of the wave-mean oscillation. The results provide an example of time-dependent normal mode instability of a strongly nonlinear time-dependent baroclinic flow.
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  • Samelson, R. M., C. L. Wolfe, 2003: A Nonlinear Baroclinic Wave-Mean Oscillation with Multiple Normal Mode Instabilities. Journal of the Atmospheric Sciences, 60(9), 1186–1199.
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  • 60
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  • 9
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  • This research was supported bythe Office of Naval Research, Grant N00014-98-1-0813,Code 322 OM.
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  • description.provenance : Approved for entry into archive by Sue Kunda(sue.kunda@oregonstate.edu) on 2011-12-30T17:10:49Z (GMT) No. of bitstreams: 1 SamelsonRM.CEOAS.NonlinearBaroclinicWave.pdf: 3278050 bytes, checksum: ce9cf5e34fafe1d4fead93d4bdca9b49 (MD5)
  • description.provenance : Made available in DSpace on 2011-12-30T17:10:49Z (GMT). No. of bitstreams: 1 SamelsonRM.CEOAS.NonlinearBaroclinicWave.pdf: 3278050 bytes, checksum: ce9cf5e34fafe1d4fead93d4bdca9b49 (MD5) Previous issue date: 2003-05
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