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Hydrographic evidence that the low nitrate δ15N in the shallow thermocline of the SCS derives from in situ remineralization of newly fixed N. (A) The nutrient concentration above 500 m is more elevated than in the open western Pacific on any given isopycnal. (B) The shallow SCS (between 100 m and 500 m) has a lower nitrate δ15N at a given nitrate concentration in comparison with the open western Pacific.
