Explore ocean currents and their impact on marine productivity in this 47-minute lecture from Yale University's "The Atmosphere, the Ocean and Environmental Change" course. Dive into the two main types of ocean currents: thermohaline and wind-driven. Understand how wind stress and the Coriolis force contribute to the formation of geostrophic currents and gyre circulations in the Atlantic and Pacific Oceans. Examine the connection between ocean physics and biological productivity, with a focus on equatorial and coastal upwelling. Learn about water transport in ocean currents and explore the circulation patterns in the Atlantic, Pacific, Southern, and Arctic Oceans. Conclude with an overview of primary productivity in the ocean, linking physical oceanography to marine biology.