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• W2000545753 abstract "Sources of natural Fe(III)-complexing organic ligands which control vertical distributions of Fe(III) hydroxide solubilities [Fe(III) solubility,<0.025 μm] and labile dissolved Fe (<0.22 μm) concentrations were studied at the subarctic and subtropical surface waters (5–300-m depth) in the northwestern North Pacific Ocean during June 2002. High Fe(III) solubility values (0.7–1.3 nM) were observed at the depth of high chlorophyll a (Chl a ) concentrations in the surface mixed layer with no strong correlation between Fe(III) solubility and size-fractionated Chl a concentrations. However, a significant correlation was found between Fe(III) solubility values and heterotrophic bacteria abundance at 5–100-m depth in the subarctic coastal water. The high Fe(III) solubility observed in the surface mixed layer is probably due to the production of natural Fe(III)-complexing organic ligands, such as siderophores , which were possibly released by specific phytoplankton or bacteria species. Higher Fe(III) solubility values than the labile dissolved Fe concentrations in the surface waters indicate that natural Fe(III)-complexing organic ligands are in excess of labile dissolved Fe concentrations. The Fe(III) solubility levels appeared to increase with depth in mid-depth waters (100–300-m depth), especially in the subarctic waters, in association with higher iron levels (labile dissolved Fe and dissolvable Fe concentrations), nutrient concentrations and humic-type fluorescence intensity . The relatively strong linear correlations between labile dissolved Fe concentrations or Fe(III) solubility values and humic-type fluorescence intensity in mid-depth waters suggest that the labile dissolved Fe concentrations and Fe(III) solubility in mid-depth waters are primarily associated with humic-type fluorescent organic matter produced through the oxidative decomposition and transformation of sinking biogenic organic matter. Humic-type fluorescent organic matter (i.e., marine dissolved humic substances) may thus account for a significant fraction of the Fe(III)-complexing organic ligands, which control Fe(III) solubility and labile dissolved Fe concentrations in mid-depth waters." @default.
• W2000545753 created "2016-06-24" @default.
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• W2000545753 date "2004-05-01" @default.
• W2000545753 modified "2023-10-14" @default.
• W2000545753 title "Spatial variability of iron in the surface water of the northwestern North Pacific Ocean" @default.
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• W2000545753 doi "https://doi.org/10.1016/j.marchem.2003.12.007" @default.
• W2000545753 hasPublicationYear "2004" @default.
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