Why is productivity high in polar oceans?

Productivity in polar oceans is high primarily due to the availability of nutrient-rich waters that are brought to the surface through processes like upwelling and mixing driven by wind and currents. The extended daylight during summer months enhances photosynthesis among phytoplankton, which serve as the base of the food web. Additionally, cold water holds higher concentrations of dissolved oxygen, supporting diverse marine life. These factors combined create a conducive environment for high biological productivity in polar regions.