How does upwelling promote the abundance of life in the surface waters of the ocean?

Upwelling occurs when deep, nutrient-rich waters rise to the ocean's surface, bringing essential nutrients like nitrates and phosphates to the photic zone. These nutrients stimulate phytoplankton growth, forming the foundation of the marine food web. As phytoplankton flourish, they support a diverse array of marine life, including fish, which rely on these primary producers for sustenance. Consequently, upwelling regions are often characterized by high biological productivity and biodiversity.