What part does upwelling play in the global circulation of ocean water?

Upwelling is a process where deep, cold, nutrient-rich water rises to the surface, bringing essential nutrients to the surface waters that support marine ecosystems. This process is crucial for the productivity of marine life and can lead to cooler surface temperatures in coastal regions. Upwelling is driven by factors such as wind patterns and the Earth's rotation, which play a significant role in the global circulation of ocean water.