Question

what type of map would most likely be used to depict the speed and direction of ocean currents

Answer 1

Mathematically, divergence is the net gain or loss of fluid per unit volume per unit time and is given by the dot product of the gradient operator and the velocity vector of the fluid. An incompressible fluid, which is an excellent approximation for the study of ocean currents, has zero divergence. Common usage for the surface of the ocean is that Convergence is the accumulation of water particles, and water sinks or is down-welled. Weed lines, that are great for fishing, can be, and oceanic surface drifters are, usually found in convergence zones. Divergence of surface waters is indicated by surface drifters leaving an area. Upwelled water, that is usually colder and nutrient-rich, from below replaces the diverging surface flow. (ADD BIOSYNOP figure) 

Currents are the coherent horizontal movement of water. Density currents are driven by gravity. Density differences in a fluid in a gravitational field leads to pressure differences that drive flows. Examples of density currents are turbidity currents or the thermohaline circulation. Geostrophic currents are controlled by a balance between a pressure gradient force and the Coriolis deflection. Geostrophic currents flow along isobars, in contrast, to our everday experience of fluids flowing from high pressure to low pressure. Large-scale mid-latitude ocean (and atmospheric) flow are in approximate geostrophic balance. The other significant component of large-scale ocean circulation flow is wind-driven and is known as Ekman flow.

Answer 2

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$\color{Red}{Here \: is \: your \: answer}$
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Thematic Map is the map most likely to show the direction and speed of ocean currents

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