Distribution and concentration of soluble manganese(II), soluble reactive Mn(III)-L, and particulate MnO2 in the Northwest Atlantic Ocean
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Distribution and concentration of soluble manganese(II), soluble reactive Mn(III)-L, and particulate MnO2 in the Northwest Atlantic Ocean

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  • Journal Title:
    Marine Chemistry
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    As manganese cycles between its three oxidation states, encompassing soluble and particulate phases, it influences the biogeochemistry of organic carbon, nutrients, and many trace elements. However, measurements of manganese distributions and speciation in the open ocean have typically been based only on differentiating soluble (assumed to be manganese(II)) and particulate (assumed to be manganese(III,IV) oxides) forms. We measured particulate oxidized manganese (MnOx, where x ≈ 1.8–2), reactive soluble manganese(III) (soluble manganese(III) that forms a complex with desferrioxamine-B (Mn(III)-LDFOB)), and total dissolved manganese (dMnT; manganese(II) + Mn(III)-LDFOB) in Northwest Atlantic offshore waters (10–2600 m). Mn(III)-LDFOB concentrations were from below the detection limit (0.008 nM) up to 0.76 nM and measured throughout the water column with higher concentrations near the base of the euphotic zone (~ 100 m), in the oxygen minimum zone (OMZ), and generally increasing from below the OMZ into the bottom waters. MnOx ranged from 0.19 nM to 3.52 nM in the water column. Concentrations were high near the base of the euphotic zone where reactions of MnOx with organic material are the likely source of the Mn(III)-LDFOB observed there. Elevated MnOx was also occasionally found in deep waters likely due to turbidity layers resulting from sediment resuspension. Mn(III)-LDFOB accounted for up to 45% of the dMnT and up to 74% of the total oxidized manganese (Mn(III)-LDFOB + MnOx) in different regions of the water column. Mn(III)-LDFOB contributed 10–20% of the generally uniform total dissolved manganese concentration in the deep ocean. Both soluble and particulate oxidized forms of manganese (Mn(III)-L and MnOx) are a significant component of the deep water manganese pool and likely play a prominent role in oceanic redox chemistry and organic carbon re-mineralization.
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    Marine Chemistry, 226, 103858
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