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Free Content On the amplification of convergences in coastal currents and the formation of "squirts"

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We consider the temporal evolution of a slow downstream decrease in the velocity of a coastal current contained in the light upper layer of the ocean. The quasi-geostrophic model consists of two piecewise uniform potential vorticity regions separated horizontally by a free interface ("front") which intersects the vertical coastal wall in a "nose" region. As time increases, the slope of the front increases in this region, and the magnitude of the downstream convergence also increases, according to a nonlinear long-wave theory. At the time when this theory becomes invalid, the calculation is continued by numerical integration of the "contour dynamical" equations. This shows a continuation of the increase of the slope of the front near the nose, provided the total geostrophic transport is nonzero. (The case of zero transport is also discussed.) As time increases, a plume forms near the nose of the front, thereby transporting coastal water to very large offshore distances. It is suggested that this effect is responsible for some of the cold water plumes which extend to large distances from the coast of California. The cause of the small finite initial convergence (not implicit in our simple model) is attributed to differential upwelling or to a current instability.

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Document Type: Research Article

Publication date: August 1, 1986

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  • The Journal of Marine Research, one of the oldest journals in American marine science, publishes peer-reviewed research articles covering a broad array of topics in physical, biological and chemical oceanography. Articles that deal with processes, as well as those that report significant observations, are welcome. Biological studies involving coupling between ecological and physical processes are preferred over those that report systematics. The editors strive always to serve authors and readers in the academic oceanographic community by publishing papers vital to the marine research in the long and rich tradition of the Sears Foundation for Marine Research. We welcome you to the Journal of Marine Research.
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