DR GENE FELDMAN, NASA GSFC / SCIENCE PHOTO LIBRARY DR GENE FELDMAN, NASA GSFC / SCIENCE PHOTO LIBRARY
False-colour satellite image of the coastal waters of northwest Africa, showing the distribution of phytoplankton in the surface waters. The colours represent varying phytoplankton densities from red (most dense) through orange, yellow and green to blue (least dense). The wind-driven upwelling of cool, nutrient-rich subsurface waters in this area causes the high phytoplankton concentrations which support some of the world's largest fisheries. The image was produced from data acquired by the Coastal Zone Colour Scanner, a radiometer with visible and infrared spectral channels which formed part of NASA's Nimbus-7 research satellite.
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