An ocean current is a continuous, directed movement of ocean water that is driven by various factors, including wind, water density differences (due to temperature and salinity), and the Earth's rotation (Coriolis effect). These currents can occur on the surface or at various depths and can significantly influence climate, weather patterns, and marine ecosystems.
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An ocean current is organized water motion that transports mass, heat, salt and other properties through the ocean. Surface winds, pressure gradients, buoyancy changes, Earth's rotation and friction all contribute, with their relative importance depending on scale and depth.
A steady large-scale interior flow can approximately balance a horizontal pressure gradient against the Coriolis force, while boundary currents require additional dynamics. Henry Stommel showed that the latitude dependence of rotation, combined with friction in a wind-driven basin, can concentrate the return flow on the western side. The circulation is therefore not simply water moving in the direction of the local wind.[ref]
The westward intensification of wind-driven ocean currents by Henry Stommel. 1948 rotating-basin model with wind stress and linear bottom friction