How does ocean stratification affect nutrient distribution and productivity?

How does ocean stratification affect nutrient distribution and productivity?

• A. Stratification reduces vertical mixing, limiting nutrient supply to surface waters; upwelling or mixing events can boost productivity by bringing nutrients to the photic zone.
• B. Stratification increases vertical mixing, enhancing nutrient supply to surface waters.
• C. Stratification has no effect on productivity.
• D. Stratification only affects salinity, not nutrients.

Answer: (A)