This image shows a global composite of the chlorophyll a content of the world s oceans. Blue colors indicate low chlorophyll concentrations.
Green colors indicate increased chlorophyll.
Yellow and red suggest very high chlorophyll concentrations. The result is an indication of the average global biosphere over the past several years. This reprocessing effort addressed several issues in the calibration algorithms, including the problem of negative water-leaving radiance values that occur sometimes in coastal areas. The images shown here illustrate the improvements that resulted from this reprocessing effort. These two images depict the chlorophyll a values in an upwelling zone off the western shore of Chile.