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. Dissolved iron (DFe) distributions ( a evidenced by satellite images. Using the new tracer Fe*=DFe− r Fe:P (PO 4 3− ) we show that DFe was in deficit compared to PO 4 3− resulting from the remineralisation of organic matter. This suggests that the Marquesas islands and the surrounding plateau are not a significant source of DFe. In the gyre, DFe concentrations in the upper 350 m water column were around 0.1 nM and the ferricline was located well below the nitracline. These low concentrations reflect the low input of DFe from the atmosphere, from the ventilation of the upper thermocline with water containing low DFe, and from the low biological activity within this ultra oligotrophic gyre.

Dissolved iron distribution in the tropical and sub tropical South Eastern Pacific