Nonlinear transverse oscillations of a geostrophic front

A planar problem of nonlinear transverse oscillations of the surface (warm) front of a finite width is considered within the framework of a reduced-gravity model of the ocean. The source of oscillations is the departure of the front from its geostrophic equilibrium. When the current velocity is linear in the horizontal coordinate and the front's depth is quadratic in this coordinate, the problem is reduced to a system of four ordinary differential equations in time. As a result, the solution is obtained in a weakly nonlinear approximation and strongly nonlinear oscillations of the front are studied by numerically solving this system of equations by the Runge-Kutta method. The front's oscillations are always superinertial. Nonlinearity can lead to a decrease or increase in the oscillation frequency in comparison with the linear case. The oscillations are most intense when the current velocity is disturbed in the direction of the front's axis. A weakly nonlinear solution of the second order describes the oscillations very accurately even for initial velocity disturbances reaching 50% of its geostrophic value. An increase in the background-current shear leads to the damping of oscillations of the front's boundary. The amplitude of oscillations of the current velocity increases as the intensity of disturbances increases, and it is relatively small if background-current shears are small or large

3. Wochenbericht M98

3. Wochenbericht M98, Fortaleza-Walvis Bay 1.7.-28.7.201

1. Wochenbericht L'ATALANTE ATA_IFMGEOMAR/4

Der 4. und letzte Abschnitt der L'Atalante-Expedition fand vom 22.02. - 16.03.2008 unter der Fahrtleitung von Prof. Dr. Peter Brandt statt. Dieser Abschnitt startet in Mindelo (Kap Verde) und endete auch dort. 1. Wochenbericht (23. Februar – 1. März 2008

2. Wochenbericht M98

2. Wochenbericht M98, Fortaleza-Walvis Bay 1.7.-28.7.201

1. Wochenbericht M80/1

Meteor-Reise 80/1 1. Wochenbericht M80/1, Mindelo-Mindelo 26.10.-1.11.200

3. Wochenbericht M80/1

Meteor-Reise 80/1 3. Wochenbericht M80/1, Mindelo-Mindelo 9.11.-15.11.200