Ekman current meter

The Ekman current meter is an instrument used in oceanography to measure the speed and direction of ocean currents. Developed by Swedish oceanographer V. Walfrid Ekman, this meter, along with his other contributions like the Ekman layer and Ekman spiral, helped advance the understanding of ocean dynamics.1

Ekman's research, particularly his 1902 report, considered the balance between wind friction, water friction, and the Coriolis force due to Earth's rotation. This theoretical work explained why drifting ice did not move in the exact direction of the wind. The Ekman current meter, known for its simple and reliable mechanism, has been a valuable tool for oceanographers, with subsequent improvements allowing for continuous measurements of currents over extended periods. These instruments are crucial for establishing absolute currents and monitoring rapid changes in the ocean.12