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dc.contributor.author
Brzezinski, Mark A.
dc.contributor.author
Closset, Ivia
dc.contributor.author
Jones, Janice L.
dc.contributor.author
de Souza, Gregory F.
dc.contributor.author
Maden, Colin
dc.date.accessioned
2021-10-22T18:54:34Z
dc.date.available
2021-09-13T04:07:46Z
dc.date.available
2021-10-22T18:54:34Z
dc.date.issued
2021-08-19
dc.identifier.issn
2296-7745
dc.identifier.other
10.3389/fmars.2021.699762
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/505293
dc.identifier.doi
10.3929/ethz-b-000505293
dc.description.abstract
The silicon isotope composition of silicic acid, delta Si-30(OH)(4), in the deep Arctic Ocean is anomalously heavy compared to all other deep ocean basins. To further evaluate the mechanisms leading to this condition, delta Si-30(OH)(4) was examined on US GEOTRACES section GN01 from the Bering Strait to the North Pole. Isotope values in the polar mixed layer showed a strong influence of the transpolar drift. Drift waters contained relatively high [Si(OH)(4)] with heavy delta Si-30(OH)(4) consistent with the high silicate of riverine source waters and strong biological Si(OH)(4) consumption on the Eurasian shelves. The maximum in silicic acid concentration, [Si(OH)(4)], within the double halocline of the Canada Basin formed a local minimum in delta Si-30(OH)(4) that extended across the Canada Basin, reflecting the high-[Si(OH)(4)] Pacific source waters and benthic inputs of Si(OH)(4) in the Chukchi Sea. delta Si-30(OH)(4) became lighter with the increase in [Si(OH)(4)] in intermediate and deep waters; however, both Canada Basin deep water and Eurasian Basin deep water were heavier than deep waters from other ocean basins. A preliminary isotope budget incorporating all available Arctic delta Si-30(OH)(4) data confirms the importance of isotopically heavy inflows in creating the anomalous deep Arctic Si isotope signature, but also reveals a surprising similarity in the isotopic composition of the major inflows compared to outflows across the main gateways connecting the Arctic with the Pacific and the Atlantic. This similarity implies a major role of biological productivity and opal burial in removing light isotopes entering the Arctic Ocean from rivers.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Frontiers Media
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
nutrients
en_US
dc.subject
biogeochemical cycles
en_US
dc.subject
diatoms
en_US
dc.subject
silicon isotopes
en_US
dc.subject
Arctic ocean
en_US
dc.subject
Geotraces
en_US
dc.subject
stable isotope Si30
en_US
dc.title
New Constraints on the Physical and Biological Controls on the Silicon Isotopic Composition of the Arctic Ocean
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
ethz.journal.title
Frontiers in Marine Science
ethz.journal.volume
8
en_US
ethz.pages.start
699762
en_US
ethz.size
24 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Lausanne
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03956 - Vance, Derek / Vance, Derek
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03946 - Schönbächler, Maria / Schönbächler, Maria
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03956 - Vance, Derek / Vance, Derek
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03946 - Schönbächler, Maria / Schönbächler, Maria
ethz.date.deposited
2021-09-13T04:07:56Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2021-10-22T18:54:43Z
ethz.rosetta.lastUpdated
2024-02-02T15:10:52Z
ethz.rosetta.versionExported
true
ethz.COinS
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