Ocean chemistry and deep-sea sediments

The answers are:• The nutrient-poor NADW flowssouthward in the western Atlanticand receives a steady rain ofnutrients.• They are sinking from the surfaceto the deep ocean where theyconcentrate.• In the south the AAIW andAABW contributes more nutrientsto the deep water before it flowsinto the Pacific.• Here, deep-water is furtherenriched in nutrients. This water isbecoming also one of the oldestwater masses.