ELI5: Explain Like I'm 5

Taylor column

Imagine you're in a bathtub and you put your hand in the water, moving it around in circles. You will see that the water around your hand moves in the same direction as your hand. But if you move your hand really fast, the water around it starts to spin too (like a miniature whirlpool).

The same thing happens when a big round object, like the Earth, rotates in a fluid (like water or air). The fluid close to the rotating object, called the boundary layer, tries to spin with it, but the rotation of the Earth pulls it along in a kind of circular motion. This circular motion is called a Taylor column.

The Taylor column happens because of how the fluid around the boundary layer is affected by the spinning of the Earth. As it moves further away from the object, the fluid can't maintain the same circular motion as the object, and so it starts to slow down and rotate less. This causes an area in the middle of the fluid to start rotating with the same speed as the object while the fluid around this area moves in a circular motion. This creates the Taylor column.

Scientists study the Taylor column to understand how rotating bodies interact with fluids. It can help them understand things like ocean currents and the movement of air in the atmosphere. So, just like how the water in your bathtub moves because of your hand, the water and air around the Earth moves because of its spinning, creating the Taylor column.