An intial front in a southward flow is constructed in the model. The north and south boundary conditions remain at the initial state and the interior flow evolves freely. A salinity section through the middle of the model front is analyzed using wavelets. The growth of the initial instability is measured and the quasi-steady final state is begin characterized. The upper line is the salinity section.
Right hand is north and left hand is south.
The contour is wavelet modulus, representing mode amplitude. The initial instability occurs in the northern section at wavelenghts roughly 15 km. The instability packet has moved downstream, grown in amplitude and shifted to somewhat longer wavelengths. Fingers have formed.