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How do ocean currents work?

Welcome! I'm really looking forward to exploring the world's ocean currents with you today.

Before we dive into the science of how these massive underwater highways shape our planet, I'd love to know what brings you to this topic and whether you have any prior background in earth science or physics.

I'm just curious and have no background in science.

It is great to have you here! Exploring the ocean without getting bogged down in dense formulas or heavy academic jargon is the best way to appreciate how our planet breathes.

To kick things off, let's take a look at the road map we will use to navigate these vast underwater highways. We will start by looking at the big picture, separate the surface from the deep, and finally see how it all ties together into one massive global engine.

We will begin with our first stop: understanding the two distinct systems that keep the oceans moving. Think of the ocean as a giant, two-story house. The top floor is governed entirely by the atmospheric weather outside, while the bottom floor is ruled by a slow, silent, and heavy basement circulation. To see this in action, we are going to start generating a custom diagram that maps out these two separate layers so you can easily visualize how they stack up.
Two Floors of the Ocean: Surface vs. Deep CurrentsDiagram
As that diagram compiles, the key takeaway is their share of the ocean. The top floor—the surface currents—only controls about of the ocean's water. The other 90 percent is the domain of the cold, dark deep-ocean currents. While they are driven by completely different forces, they constantly interact to keep the entire planet's climate stable.