دورية أكاديمية
Iron colloids dominate sedimentary supply to the ocean interior.
| العنوان: | Iron colloids dominate sedimentary supply to the ocean interior. |
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| المؤلفون: | Homoky WB; School of Earth and Environment, University of Leeds, Leeds LS2 9JT, United Kingdom; w.homoky@leeds.ac.uk.; Department of Earth Sciences, University of Oxford, Oxford OX1 3AN, United Kingdom., Conway TM; College of Marine Science, University of South Florida, Tampa, FL 33629., John SG; Department of Earth Sciences, University of Southern California, Los Angeles, CA 90007., König D; School of Environmental Sciences, University of Liverpool, Liverpool L69 3GP, United Kingdom., Deng F; Department of Earth Sciences, University of Oxford, Oxford OX1 3AN, United Kingdom., Tagliabue A; School of Environmental Sciences, University of Liverpool, Liverpool L69 3GP, United Kingdom., Mills RA; School of Ocean and Earth Science, University of Southampton, Southampton SO17 1BJ, United Kingdom. |
| المصدر: | Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2021 Mar 30; Vol. 118 (13). |
| نوع المنشور: | Journal Article; Research Support, Non-U.S. Gov't |
| اللغة: | English |
| بيانات الدورية: | Publisher: National Academy of Sciences Country of Publication: United States NLM ID: 7505876 Publication Model: Print Cited Medium: Internet ISSN: 1091-6490 (Electronic) Linking ISSN: 00278424 NLM ISO Abbreviation: Proc Natl Acad Sci U S A Subsets: PubMed not MEDLINE; MEDLINE |
| أسماء مطبوعة: | Original Publication: Washington, DC : National Academy of Sciences |
| مستخلص: | Dissolution of marine sediment is a key source of dissolved iron (Fe) that regulates the ocean carbon cycle. Currently, our prevailing understanding, encapsulated in ocean models, focuses on low-oxygen reductive supply mechanisms and neglects the emerging evidence from iron isotopes in seawater and sediment porewaters for additional nonreductive dissolution processes. Here, we combine measurements of Fe colloids and dissolved δ 56 Fe in shallow porewaters spanning the full depth of the South Atlantic Ocean to demonstrate that it is lithogenic colloid production that fuels sedimentary iron supply away from low-oxygen systems. Iron colloids are ubiquitous in these oxic ocean sediment porewaters and account for the lithogenic isotope signature of dissolved Fe (δ 56 Fe = +0.07 ± 0.07‰) within and between ocean basins. Isotope model experiments demonstrate that only lithogenic weathering in both oxic and nitrogenous zones, rather than precipitation or ligand complexation of reduced Fe species, can account for the production of these porewater Fe colloids. The broader covariance between colloidal Fe and organic carbon (OC) abundance suggests that sorption of OC may control the nanoscale stability of Fe minerals by inhibiting the loss of Fe(oxyhydr)oxides to more crystalline minerals in the sediment. Oxic ocean sediments can therefore generate a large exchangeable reservoir of organo-mineral Fe colloids at the sediment water interface (a "rusty source") that dominates the benthic supply of dissolved Fe to the ocean interior, alongside reductive supply pathways from shallower continental margins. Competing Interests: The authors declare no competing interest. |
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| فهرسة مساهمة: | Keywords: iron colloid; iron isotopes; ocean sediment; organo-mineral; porewater |
| تواريخ الأحداث: | Date Created: 20210327 Date Completed: 20211013 Latest Revision: 20211013 |
| رمز التحديث: | 20231215 |
| مُعرف محوري في PubMed: | PMC8020654 |
| DOI: | 10.1073/pnas.2016078118 |
| PMID: | 33771922 |
| قاعدة البيانات: | MEDLINE |
| تدمد: | 1091-6490 |
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| DOI: | 10.1073/pnas.2016078118 |