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Phosphorus burial i...
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Kubeneck, L. JoëlleUtrecht University,ETH Zürich
(författare)
Phosphorus burial in vivianite-type minerals in methane-rich coastal sediments
- Artikel/kapitelEngelska2021
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Nummerbeteckningar
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LIBRIS-ID:oai:lup.lub.lu.se:c6483195-58bf-4324-9314-e4b8b655cc6b
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https://lup.lub.lu.se/record/c6483195-58bf-4324-9314-e4b8b655cc6bURI
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https://doi.org/10.1016/j.marchem.2021.103948DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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Sediments are a key sink for phosphorus (P) in coastal systems. This allows coastal areas to act as a filter for P that is transported from land to sea. Recent work suggests that vivianite-type ferrous iron (Fe(II))-P minerals may be more important as a sink for P in coastal sediments than previously thought. Here, we investigate the occurrence of such vivianite-type minerals in sediments of three eutrophic coastal sites with contrasting dynamics with respect to iron (Fe) and sulfur (S), covering a salinity range of 0 to 7. We only find authigenic vivianite-type minerals at the low and intermediate salinity sites, where Fe is available in excess over sulfide production. Sequential extractions combined with SEM-EDS and μXRF analysis point towards substitution of Fe in vivianite-type minerals by other transition metal cations such as magnesium and manganese, suggesting potentially different formation pathways modulated by metal cation availability. Our results suggest that vivianite-type minerals may act as a key sink for P in sediments of many other brackish coastal systems. Climate change-driven modulations of coastal bottom water salinity, and hence, Fe versus S availability in the sediment, may alter the role of vivianite-type minerals as a P burial sink over the coming decades. Model projections for the Baltic Sea point towards increased river input and freshening of coastal waters, which could enhance P burial. In contrast, sea level rise in the Chesapeake Bay area is expected to lead to an increase in bottom water salinity and this could lower rates of P burial or even liberate currently buried P, thereby enhancing eutrophication.
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Lenstra, Wytze K.Utrecht University
(författare)
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Malkin, Sairah Y.University of Maryland
(författare)
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Conley, Daniel J.Lund University,Lunds universitet,Kvartärgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Quaternary Sciences,Department of Geology,Faculty of Science(Swepub:lu)geol-dcy
(författare)
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Slomp, Caroline P.Utrecht University
(författare)
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Utrecht UniversityETH Zürich
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Marine Chemistry: Elsevier BV2310304-4203
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