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Below mixed layer 0.0098 ± 0.0016 0.0063 ± 0.0005 0.0099 ± 0.0043 0.0201 ± 0.0207 0.0104 ± 0.0040 0.0070 ± 0.0024
All data Mixed layer 0.0058 ± 0.0036 0.0043 ± 0.0027 0.01121 ± 0.0034 0.0160 ± 0.0148 0.0066 ± 0.0041 0.0084 ± 0.0043
Below mixed layer 0.0138 ± 0.0037 0.0082 ± 0.0023 0.0084 ± 0.0036 0.0141 ± 0.0153 0.0104 ± 0.0030 0.0078 ± 0.0037
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The distribution of UPF 1069 cumulative fluorescence intensity of humic-like components IHumic in the meridional section followed the distribution of the aCDOM(305), with elevated values in the surface at northern and southern continental margins of the transect, strong depletion of IHumic in the mixed layer in the northern and southern subtropical oligotrophic gyres and maximum values in the subsurface waters in the Equatorial Upwelling Zone (between 7 and 5°N at 50 m depth). There was evidence of advection of humic-like material between 20°N and 20°S associated with the Equatorial Upwelling. This was in contrast to the distribution of marine humic-like C5 that was strongly depleted in the surface layer (0–50 m depth) across all provinces except the PAS, where it reached a maximum.