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The ratio of aCDOM (350) to fluorescence at λex/λem = 350/450 nm (Del Vecchio and Blough, 2004b and Vodacek et al., 1997) for offshore waters away from the influence of the Congo River, was 0.122 (m? 1 qse? 1), while a larger value of 0.227 (m? 1 qse? 1) was observed for waters in the region of the Congo River outflow. These values are similar to values recorded for waters in the Delaware Bay and the mid-Atlantic Bight (0.125–0.227 based on aCDOM (355) at λex/λem = 355/450 nm) consistent with photochemically modified terrestrial material, although they JTP-74057 fall at the upper and lower limit of that range. The lower absorption to fluorescence ratio observed for offshore waters agrees with the higher quantum efficiency observed for these waters relative to waters of the Congo River outflow. This result is consistent with CDOM in these waters being modified (lower molecular weight) relative to the waters of the Congo River outflow (Boyle et al., 2009).
A few samples did not fit these trends and appear as outliers in Fig. 7 (blue labeled station numbers 58 & 89). However, these are the same samples that exhibited distinct emission bands at the wavelengths explored (Fig. 6) supporting the conclusion that UV bands arise from a different source.
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