DR GENE FELDMAN, NASA GSFC / SCIENCE PHOTO LIBRARY DR GENE FELDMAN, NASA GSFC / SCIENCE PHOTO LIBRARY
False-colour satellite image of the oceans around Antarctica, showing the summer distribution of phytoplankton in the surface water. The colours represent varying phytoplankton densities from red (most dense) through yellow and green to blue (least dense). Land areas are black and regions where no measurements were possible are coloured grey. Highly seasonal blooms charcterize these polar waters, as the long, dark winter prevents photosynthesis. The image was produced from data acquired by the Coastal Zone Colour Scanner, one of the instruments on NASA's Nimbus-7 research satellite.
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