{"refrec":{"BRefID":363194,"RR":"<b>Genovese, C.; Grotti, M.; Pittaluga, J.; Ardini, F.; Janssens, J.; Wuttig, K.; Moreau, S.; Lannuzel, D.</b> (2018). Influence of organic complexation on dissolved iron distribution in East Antarctic pack ice. <i>Mar. Chem. 203</i>: 28-37. <a href=\"https://dx.doi.org/10.1016/j.marchem.2018.04.005\" target=\"_blank\">https://dx.doi.org/10.1016/j.marchem.2018.04.005</a>","BEntID":360912,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Mar. Chem. 203</i>: 28-37. <a href=\"https://dx.doi.org/10.1016/j.marchem.2018.04.005\" target=\"_blank\">https://dx.doi.org/10.1016/j.marchem.2018.04.005</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Genovese, C.; Grotti, M.; Pittaluga, J.; Ardini, F.; Janssens, J.; Wuttig, K.; Moreau, S.; Lannuzel, D.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Genovese, C. <i>et al.</i>","Englishabstract":"Since Antarctic sea ice covers an area larger than the Antarctic continent itself, the discovery that it can fertilize the Southern Ocean with iron (Fe) has fostered a new breadth of research in recent years. In order to test the hypothesis that Fe-binding organic ligands control the distribution of dissolved iron (DFe) in Antarctic pack ice, iron organic speciation was investigated in samples collected during the Sea Ice Physics and Ecosystem eXperiment-2 (SIPEX-2) voyage in Austral winter/spring 2012. Dissolved Fe was measured using sector field inductively coupled plasma mass spectrometry, and iron organic speciation parameters were determined by competitive ligand equilibration - adsorptive cathodic stripping voltammetry method, using 1-nitroso-2-naphthol (NN) as the added ligand. The concentration of Fe-binding organic ligands (Lt) ranged from 4.9 nM to 41 nM (average of 14.9 ± 8.4 nM, n = 34), and was always higher than the corresponding DFe (average of 7.5 ± 4.5 nM, n = 34). Conditional stability constants (log K′<sub>Fe’L</sub> = 11.7–13.0) were similar to those previously observed in land-fast ice. Concentrations of DFe and Lt displayed similar depth profiles; their strong correlation (Spearman's ρ = 0.80, p < 0.001) suggested that Fe-binding organic ligands control DFe distribution in Antarctic pack ice. Unlike results previously obtained for land-fast ice, Fe-binding organic ligands in pack ice were never saturated with iron (Lt/DFe > 1). Estimates showed that pack ice would have released 0.45 μmol/m<sup>2</sup>/d of Lt during spring melt, 0.21 μmol/m<sup>2</sup>/d of which are free from Fe binding, and hence available for further complexation. Therefore, it is suggested that this excess of Fe-free ligands may play a key role in controlling the solubility of free or newly formed Fe in surface waters before the peak of primary production, outcompeting the Fe-binding organic ligands already present in seawater.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Influence of organic complexation on dissolved iron distribution in East Antarctic pack ice","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-22 01:32:30.904185","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Iron speciation; Sea ice; Pack ice; Organic ligands; Southern Ocean","OtherDescriptors":null,"Notes":null,"AnaPub":2018,"MonPub":null,"DateUpdate":"2023-04-05","DateCreate":"2023-04-04","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000438320900004","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.marchem.2018.04.005"},"refs":null,"anarec":{"AnaID":363194,"PubliDate":2018,"Pagination":"28-37","XtraPublOfAnaID":null,"ISBN":null,"Volume":"203","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43353,"SerRR":"Marine Chemistry. 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