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Comparison of nitrate uptake and vertical nitrogen flux. 15NO3− uptake is raw vertically integrated 15NO3− uptake. 15NO3− uptake* is a conservative estimate calculated assuming that the f-ratio at any depth cannot exceed 1. Thorium is calculated from the steady-state 234Th deficiency model and sediment trap C:234Th ratios. Error bars are standard deviations of replicate measurements.
