Repository logo
 

The growth and saturation of submesoscale instabilities in the presence of a barotropic jet

Accepted version
Peer-reviewed

Loading...
Thumbnail Image

Type

Article

Change log

Authors

Stamper, MA 
Taylor, JR 
Fox-Kemper, B 

Abstract

jats:titleAbstract</jats:title>jats:pMotivated by recent observations of submesoscales in the Southern Ocean, we use nonlinear numerical simulations and a linear stability analysis to examine the influence of a barotropic jet on submesoscale instabilities at an isolated front. Simulations of the nonhydrostatic Boussinesq equations with a strong barotropic jet (approximately matching the observed conditions) show that submesoscale disturbances and strong vertical velocities are confined to a small region near the initial frontal location. In contrast, without a barotropic jet, submesoscale eddies propagate to the edges of the computational domain and smear the mean frontal structure. Several intermediate jet strengths are also considered. A linear stability analysis reveals that the barotropic jet has a modest influence on the growth rate of linear disturbances to the initial conditions, with at most a ~20% reduction in the growth rate of the most unstable mode. On the other hand, a basic state formed by averaging the flow at the end of the simulation with a strong barotropic jet is linearly stable, suggesting that nonlinear processes modify the mean flow and stabilize the front.</jats:p>

Description

Keywords

Fronts, Instability, Nonhydrostatic models

Journal Title

Journal of Physical Oceanography

Conference Name

Journal ISSN

0022-3670
1520-0485

Volume Title

48

Publisher

American Meteorological Society
Sponsorship
Natural Environment Research Council (NE/J010472/1)