Instability caused by the coalescence of two modes of a one-layer coastal current with a surface front |
| |
Authors: | Atsushi Kubokawa |
| |
Institution: | (1) Geophysical Institute, Faculty of Science, Tohoku University, 980 Sendai, Japan |
| |
Abstract: | Stability of a one-layer density-driven coastal current with a surface front whose potential vorticity is uniformly zero is examined, and it is shown that such a current can be unstable if the stability condition derived by Paldor (1983) is not satisfied,i.e., the current width,L, is larger than 2/3U/f, wheref is the Coriolis parameter andU is the current velocity at the front. This instability is caused by the coalescence of a frontal trapped and coastal trapped waves. The energetics of this instability and the effect of potential vorticity gradient are also discussed. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|