Ocean Chlorophyll Concentration (2009-2012)
These chlorophyll maps show milligrams of chlorophyll per cubic meter of seawater from 2009 to 2012 derived using data from the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument onboard NASA's Aqua satellite. Places where chlorophyll amounts were very low, indicating very low numbers of phytoplankton are blue. Places where chlorophyll concentrations were high are red. Places where MODIS could not collect data, because of sea ice, polar darkness, or clouds, are light gray. The highest chlorophyll concentrations, where tiny surface-dwelling ocean plants are thriving, are found in cold polar waters or in places where ocean currents bring cold water to the surface.