Results from our analysis suggest that standard empirical oceancolour
algorithms, based either on a band-ratio (OC4) or band difference
(OCI), over estimate chlorophyll in the Red Sea, possibly due
to an excess of CDOM absorption per unit chlorophyll. Knowledge on
the sources and sinks of CDOM in the Red Sea remain elusive. An
argument that would contradict our hypothesis is that there is very little
riverine input in the Red Sea (Patzert, 1974), such that any additional
CDOM is unlikely to come from terrestrial sources. A further argument
against high CDOM is that the Red Sea is close to the tropics, and
exposed to intense surface irradiance. Therefore, any CDOM produced
would be expected to undergo rapid degradation from photo-bleaching
(Nelson & Siegel, 2013; Vodacek et al., 1997). As discussed in the previous
sections, there are also other reasons that may explain an over estimation
in chlorophyll from standard satellite algorithms, such as
uncertainty in the performance of atmospheric-correction algorithms
and effects of aeolian dust deposition on the optical properties of the
water (Claustre et al., 2002).
Results from our analysis suggest that standard empirical oceancolouralgorithms, based either on a band-ratio (OC4) or band difference(OCI), over estimate chlorophyll in the Red Sea, possibly dueto an excess of CDOM absorption per unit chlorophyll. Knowledge onthe sources and sinks of CDOM in the Red Sea remain elusive. Anargument that would contradict our hypothesis is that there is very littleriverine input in the Red Sea (Patzert, 1974), such that any additionalCDOM is unlikely to come from terrestrial sources. A further argumentagainst high CDOM is that the Red Sea is close to the tropics, andexposed to intense surface irradiance. Therefore, any CDOM producedwould be expected to undergo rapid degradation from photo-bleaching(Nelson & Siegel, 2013; Vodacek et al., 1997). As discussed in the previoussections, there are also other reasons that may explain an over estimationin chlorophyll from standard satellite algorithms, such asuncertainty in the performance of atmospheric-correction algorithmsand effects of aeolian dust deposition on the optical properties of thewater (Claustre et al., 2002).
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