What are wind-driven currents that affect water to a depth of several hundred meters and can move as fast as 100 km/day called?

What are wind-driven currents that affect water to a depth of several hundred meters and can move as fast as 100 km/day called?

• A. Surface currents
• B. Deep currents
• C. Tidal currents
• D. Subsurface currents

Answer: (A)

Wind-driven surface currents are caused when winds transfer momentum to the ocean’s surface, setting a horizontal flow in the upper layers. This wind-induced motion can extend down into the water to several hundred meters, depending on wind strength and water stratification, and can carry water at speeds around 100 kilometers per day. The flow is steered by the Coriolis effect, creating large, swirling gyres in the oceans. In contrast, deep currents are driven mainly by density differences and occur much deeper with slower speeds; tidal currents arise from the Moon’s and Sun’s gravity and are strongest near coastlines; subsurface currents exist below the surface but aren’t primarily driven by wind.

Wind-driven surface currents are caused when winds transfer momentum to the ocean’s surface, setting a horizontal flow in the upper layers. This wind-induced motion can extend down into the water to several hundred meters, depending on wind strength and water stratification, and can carry water at speeds around 100 kilometers per day. The flow is steered by the Coriolis effect, creating large, swirling gyres in the oceans. In contrast, deep currents are driven mainly by density differences and occur much deeper with slower speeds; tidal currents arise from the Moon’s and Sun’s gravity and are strongest near coastlines; subsurface currents exist below the surface but aren’t primarily driven by wind.