Why an polar ice ecosystem support large number of phytoplankton?

Polar ice ecosystems support a large number of phytoplankton due to the availability of sunlight during the summer months, which stimulates photosynthesis. Melting ice creates a nutrient-rich environment, as nutrients are released from the melting ice and mixed into the water column. Additionally, the cold waters are often well-mixed, allowing for efficient nutrient distribution. This combination of sunlight, nutrients, and conducive water conditions fosters a thriving phytoplankton population, which forms the foundation of the polar food web.