Indian Ocean,chlorophyll concentration and bathymetry. Computer graphic of the Indian Ocean on an Earth globe,generated using satellite and mapping data,with bathymetry data used to show the contours,ridges,peaks and plateaus of the seabed. Satellite-measured ocean chlorophyll concentrations are colour-coded: high values in red,yellow and green,low values in blue and purple. Chlorophyll is present in photosynthesising plankton blooming where nutrients are concentrated where currents meet,deep water upwells,or nutrients run off from the land. Chlorophyll data obtained by the MODIS sensor on NASA's Aqua satellite |