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Revisiting the dissolution of biogenic Si in marine sediments: a key term in the ocean Si budget
Swedish Museum of Natural History, Department of Geology.ORCID iD: 0000-0002-1012-0642
2017 (English)In: Acta Geochimica, ISSN 2096-0956, Vol. 36, no 3, p. 429-432Article in journal (Refereed) Published
Abstract [en]

Of the ~240 × 1012 mol year−1 of biogenic silica (bSi) produced by diatoms and other silicifying organisms, only roughly 3%–4% escapes dissolution to be permanently buried. At the global scale, how, where and why bSi is preserved in sediment is not well understood. To help address this, I compile 6245 porewater dissolved Si concentrations from 453 sediment cores, to derive the concentration gradient at the sediment–water interface and thus diffusive fluxes out of the sediment. These range from <0.002 to 3.4 mol m−2 year−1, and are independent of temperature, depth and latitude. When classified by sediment lithology, predominantly siliceous sediments unsurprisingly have higher mean diffusive fluxes than predominantly calcareous or clay-rich sediment. Combined with the areal extent of these lithologies, the ‘best-guess’ global sedimentary bSi recycling flux is 69 × 1012 mol year−1.

Place, publisher, year, edition, pages
2017. Vol. 36, no 3, p. 429-432
Keyword [en]
Biogenic silica, Diatoms, Ocean Si cycle, Dissolution
National Category
Geochemistry Geosciences, Multidisciplinary Oceanography, Hydrology and Water Resources
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-2568DOI: 10.1007/s11631-017-0183-1OAI: oai:DiVA.org:nrm-2568DiVA, id: diva2:1162381
Conference
Geochemistry of the Earth's Surface
Funder
Swedish Research Council, 2015-06419
Available from: 2017-12-04 Created: 2017-12-04 Last updated: 2018-01-13Bibliographically approved

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Publisher's full texthttps://link.springer.com/article/10.1007/s11631-017-0183-1

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