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Temporal changes in δ 15 N values of sinking particles collected with sediment traps in the Benguela upwelling regime off southwest Africa mirrored variations in the input of inorganic nitrogen to the surface water. Reductions in δ 15 N (to as low as 2.5%%) corresponded to low sea surface temperatures during austral spring and late austral autumn/early winter, indicating...
Sedimentary δ 15 N contains a record of biogeochemical processes occurring in the water column. Stable nitrogen isotopes were measured in the bulk sedimentary matter of 18 surface sediment samples collected in three transects in the eastern Angola Basin, perpendicular to the coast, at 6°S, 12°S and 17°S and two samples from the Zaire estuary. Relative enrichment in 15 N...
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