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dc.contributor.author
Kubeneck, Luisa J.
dc.contributor.author
Lenstra, Wytze K.
dc.contributor.author
Malkin, Sairah Y.
dc.contributor.author
Conley, Daniel J.
dc.contributor.author
Slomp, Caroline P.
dc.date.accessioned
2021-03-02T11:09:32Z
dc.date.available
2021-03-02T03:55:19Z
dc.date.available
2021-03-02T11:09:32Z
dc.date.issued
2021-04-20
dc.identifier.issn
1872-7581
dc.identifier.issn
0304-4203
dc.identifier.other
10.1016/j.marchem.2021.103948
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/472328
dc.identifier.doi
10.3929/ethz-b-000472328
dc.description.abstract
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.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Elsevier
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
Phosphorus cycle
en_US
dc.subject
Vivianite
en_US
dc.subject
Iron
en_US
dc.subject
Sediments
en_US
dc.title
Phosphorus burial in vivianite-type minerals in methane-rich coastal sediments
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2021-02-06
ethz.journal.title
Marine Chemistry
ethz.journal.volume
231
en_US
ethz.journal.abbreviated
Mar. chem.
ethz.pages.start
103948
en_US
ethz.size
13 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.scopus
ethz.publication.place
Amsterdam
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2021-03-02T03:55:23Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2021-03-02T11:09:43Z
ethz.rosetta.lastUpdated
2021-03-02T11:09:43Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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