Dust distribution across the ocean

Dust storms sweep iron-rich particles (mineral aerosols) from the continents into the atmosphere. They fall into, or are rained into, the oceans, where iron dissolves into a form that is used, along with other nutrients such as nitrate (N) and phosphate (P), by phytoplankton and bacteria to live and grow. Small marine animals (zooplankton) eat phytoplankton and bacteria. When they excrete fecal pellets or die, organic matter is transferred to the depths. (Jack Cook, Woods Hole Oceanographic Institution)