Insights into the origins, molecular characteristics and distribution of iron-binding ligands in the Arctic Ocean

doi:10.1016/j.marchem.2021.103936

CORC > 深海科学与工程研究所 > 中国科学院深海科学与工程研究所 > 深海科学研究部 > 深海地质与地球化学研究室

	Insights into the origins, molecular characteristics and distribution of iron-binding ligands in the Arctic Ocean
	Williford, Tatiana 4; Amon, Rainer M. W.4; Benner, Ronald 3; Kaiser, Karl 4; Bauch, Dorothea 1,2; Stedmon, Colin 10; Yan, Ge 4,6; Walker, Sally A.4,7; van der Loeff, Michiel Rutgers 9; Klunder, Maarten B.5,8
刊名	MARINE CHEMISTRY
	2021-04-20
卷号	231 页码:14
关键词	Dissolved organic matter Iron Organic ligands Complexation Biomarkers Optical properties CDOM Arctic Ocean
ISSN号	0304-4203
DOI	10.1016/j.marchem.2021.103936
英文摘要	Dissolved lignin phenols, chromophoric dissolved organic matter (DOM), and in situ fluorescence were determined in waters of the Laptev Sea and major Arctic basins, and they were compared with dissolved iron (dFe) distributions to elucidate the sources, molecular characteristics and distributions of iron-binding ligands in the Arctic Ocean. In the Transpolar Drift region (TPD), concentrations of dFe were positively correlated with concentrations of lignin phenols and multiple optical proxies of DOM composition and source. Strong relationships between dFe and visible and ultraviolet wavelength fluorescent DOM indicated that vascular plant and algal-derived DOM contributed to the dFe-ligand pool. These observations are consistent with previous studies suggesting the association of dFe with humic terrigenous and marine organic ligands. The primary sources of ironbinding ligands appear to be the riverine discharge of terrigenous DOM, marine organic matter produced on the shelves, and degradation products of plankton-derived organic matter in the shelf sediments. A stronger relationship between dFe and visible wavelength CDOM fluorescence than with lignin phenols suggested the presence of multiple terrigenous ligands, such as aromatic tannins. The aromatic nature of these terrigenous ligands was indicated by a strong relationship between dFe and the absorption coefficient at 254 nm. A strong negative correlation between the p-hydroxyl to vanillyl lignin phenols ratio and dissolved iron concentrations indicated recently-discharged terrigenous DOM (tDOM) was an important source of iron-binding ligands. Given the strong relationships of marine and terrigenous DOM with dissolved iron, iron-binding functional groups appear to occur in diverse molecules of multiple sources. Examples of such iron-binding functional groups included catechols and carboxylates found in lignins and tannins of terrigenous origins and carboxyl-rich alicyclic molecules (CRAM) of terrigenous and marine origins. The observed dFe distributions in the Arctic Ocean could not be explained by the presence of a single ligand type, but rather by a potpourri of ligand molecules of varying concentrations and binding strengths. This molecular diversity of ligands and associated binding strengths ultimately controls the distribution and transport of dFe in the Arctic Ocean and beyond.
资助项目	National Science Foundation[PLR0425582] ; Netherlands Organization for Scientific Research (Nederlandse Organisatie voor Wetenschappelijk Onderzoek, NOW)[822.01.018]
WOS关键词	DISSOLVED ORGANIC-MATTER ; HUMIC SUBSTANCES ; COMPLEXING LIGANDS ; ATLANTIC ; CARBON ; HALOCLINE ; SEAWATER ; WATER ; FE ; SIDEROPHORES
WOS研究方向	Chemistry ; Oceanography
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000640108900005
资助机构	National Science Foundation ; Netherlands Organization for Scientific Research (Nederlandse Organisatie voor Wetenschappelijk Onderzoek, NOW)
内容类型	期刊论文
源URL	[http://ir.idsse.ac.cn/handle/183446/8624]
专题	深海科学研究部_深海地质与地球化学研究室
通讯作者	Williford, Tatiana; Amon, Rainer M. W.
作者单位	1.GEOMAR Helmholtz Ctr Ocean Res, Kiel, Germany 2.Univ Kiel CAU, Leibniz Lab, Kiel, Germany 3.Univ South Carolina, Columbia, SC 29208 USA 4.Texas A&M Univ, Galveston Campus, College Stn, TX 77843 USA 5.CTGB, Dept Environm Fate, Ede, Netherlands 6.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Peoples R China 7.Univ Texas Austin, Appl Res Labs, Austin, TX 78713 USA 8.Royal Netherlands Inst Sea Res, Den Burg, Netherlands 9.Alfred Wegener Inst Polar & Marine Res, Bremerhaven, Germany 10.Tech Univ Denmark, Lyngby, Denmark
推荐引用方式 GB/T 7714	Williford, Tatiana,Amon, Rainer M. W.,Benner, Ronald,et al. Insights into the origins, molecular characteristics and distribution of iron-binding ligands in the Arctic Ocean[J]. MARINE CHEMISTRY,2021,231:14.
APA	Williford, Tatiana.,Amon, Rainer M. W..,Benner, Ronald.,Kaiser, Karl.,Bauch, Dorothea.,...&Klunder, Maarten B..(2021).Insights into the origins, molecular characteristics and distribution of iron-binding ligands in the Arctic Ocean.MARINE CHEMISTRY,231,14.
MLA	Williford, Tatiana,et al."Insights into the origins, molecular characteristics and distribution of iron-binding ligands in the Arctic Ocean".MARINE CHEMISTRY 231(2021):14.