Abstract
The initial-value problem for Eady's model is reexamined using a two-dimensional (x-z) primitive equation model. It is generally accepted that a finite amplitude instability of Eady's basic state will produce a frontal discontinuity in a finite time. When diffusion prevents the frontal discontinuity from forming, the wave amplitude eventually stops growing and begins to oscillate. We analyze this equilibration and suggest that it is a result of enhanced potential vorticity in the frontal region that is mixed into the interior from the boundaries. The dynamics of equilibration is crudely captured in a modified quasi-geostrophic model in which the zonal-mean static stability is allowed to vary. -from Authors
Original language | English (US) |
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Pages (from-to) | 3055-3064 |
Number of pages | 10 |
Journal | Journal of the Atmospheric Sciences |
Volume | 46 |
Issue number | 19 |
DOIs | |
State | Published - 1989 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Atmospheric Science