What are barotropic models?

A barotropic model is like a simple recipe for how water moves around on Earth, no fancy ingredients or complicated steps.

Imagine you're playing with a toy bathtub. When you turn on the faucet, water flows in, and when you lift the drain plug, water goes out. A barotropic model is like watching that water move without worrying about what's underneath it, like how hot or cold the water is, or whether there are bubbles or toys floating around.

In real life, the ocean is like that bathtub but much bigger. A barotropic model assumes all the water has the same "flavor", meaning it doesn’t care about temperature changes or salt content. It just flows based on pressure differences and how deep or shallow things are.

So, if you're drawing a map of where the ocean currents go, this kind of model is like using only blue paint, no red for warm water, no green for cold water. It’s simpler, but still gives you a good idea of what's happening.

This makes it easier to predict how tides and big waves behave, just like knowing your bathtub will fill up evenly without any toys blocking the way.