When a horizontally infinite layer of fluid is subjected to a stabilizing salt gradient and to a destabilizing temperature gradient, the system becomes unstable for a sufficiently large value of the latter. The present analysis indicates that the system should become unstable to overstable or oscillatory perturbations when the disturbance is infinitesimal....
Veronis, George. 1965. "On finite amplitude instability in thermohaline convection." Journal of Marine Research 23, (1). https://elischolar.library.yale.edu/journal_of_marine_research/1038