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. The speciation of dissolved iron (DFe) in the ocean is widelyassumed to consist almost exclusively of Fe(III)-ligand complexes. Yet inmost aqueous environments a poorly defined fraction of DFe also exists asFe(II), the speciation of which is uncertain. Here we deploy flow injectionanalysis to measure in situ Fe(II) concentrations during a seriesof mesocosm/microcosm/multistressor experiments in coastal environments inaddition to the decay rate of this Fe(II) when moved into the dark. Duringfive mesocosm/microcosm/multistressor experiments in Svalbard and Patagonia,where dissolved (0.2  µ m) Fe and Fe(II) were quantifiedsimultaneously, Fe(II) constituted 24 %–65 % of DFe, suggesting thatFe(II) was a large fraction of the DFe pool. When this Fe(II) was allowed todecay in the dark, the vast majority of measured oxidation rate constantswere less than calculated constants derived from ambient temperature,salinity, pH, and dissolved O2 . The oxidation rates of Fe(II) spikes added to Atlantic seawatermore closely matched calculated rate constants. The difference betweenobserved and theoretical decay rates in Svalbard and Patagonia was mostpronounced at Fe(II) concentrations    nM, suggesting that the effect mayhave arisen from organic Fe(II) ligands. This apparent enhancement of Fe(II)stability under post-bloom conditions and the existence of such a highfraction of DFe as Fe(II) challenge the assumption that DFe speciation incoastal seawater is dominated by ligand bound-Fe(III) species.

Fe(II) stability in coastal seawater during experiments in Patagonia, Svalbard, and Gran Canaria