Water Transparency (Diffuse attenuation coefficient at 490nm, Kd490 in m^-1 at 9km resolution): The diffuse attenuation coefficient Kd490 measures the light penetration in the water column at the blue-green wavelengths (ca. 490 nm). It represents a good indicator of water transparency resulting from the combined action of absorption and backscattering by the water constituents, and the structure of the surrounding light field.
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European Commission, Joint Research Centre (JRC)