Record Details
A Nonlinear Baroclinic Wave-Mean Oscillation with Multiple Normal Mode Instabilities
ScholarsArchive at Oregon State University
| Field | Value |
|---|---|
| Title | A Nonlinear Baroclinic Wave-Mean Oscillation with Multiple Normal Mode Instabilities |
| Names |
Samelson, R. M.,
(creator) Wolfe, C. L. (creator) |
| Date Issued | 2003-05 (iso8601) |
| Abstract | 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. |
| Genre | Article |
| Identifier | 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. |
