As light propagates through the water column, it is quickly attenuated (reduced), but not all the colours are affected at the same rate (red light for instance is attenuated more rapidly, the remaining blue/green providing the ocean with its characteristic colour). The hyperspectral radiometer measures these variations, providing light spectrum measurements as a function of depth. It is deployed by hand and free-falls to a maximum of 100m.
Figures. Hyperspectral radiometer and some typical measurements of light spectra at the surface (left) and at 10 metre depth (right). Note how the red component of light (beyond 600nm) is attenuated leaving only the blue/green component.
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