This is the back-of-the-napkin version of Earth’s climate. It’s called “zero-dimensional” because it treats the planet as a perfectly mixed, uniform sphere: no poles, no tropics, one big average temperature, no maps or weather patterns, just a look at how energy moves in and out.
What it does is balance the Earth’s energy budget, tracking the Sun, the Earth’s surface and the atmosphere through a few main processes:
- Solar radiation coming in: The Sun blasts energy our way, and this model takes that as its starting point.
- Absorption and reflection: Some of that sunlight gets absorbed, warming the planet, while the rest bounces back into space, thanks to bright surfaces like ice and clouds (this is the albedo effect).
- Thermal radiation going out: the Earth radiates heat away in the form of infrared energy.
- Finding equilibrium: work out where those energy flows balance, which gives you Earth’s temperature.
It’s a simple model, maybe too simple. It ignores weather patterns, ocean currents, and most of what the atmosphere actually does. But that’s kind of the point, it’s the thing you build the more advanced models on top of. If you want more ✨equations✨, the one-dimensional energy balance model has a bit more depth!