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Depth of the satellite Chlorophyll-a concentration data

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For satellite derived chlorophyll the depth it pertains to varies with the turbidity and hence is related to the concentration itself; the signal may return from depths as deep as 20+ m in the open ocean to as shallow as 1-2 m in highly productive waters. Also, the signal from the water closer to the surface will have a stronger influence than the signal from greater depths.

It is possible to use the diffuse attenuation coefficient to understand the penetration of light, which is often used when converting in-situ chlorophyll profiles into datasets suitable for satellite algorithm development and validation; e.g. see Sections 2.2.2 and 2.3.2 of