Biological Control of Chromium Redox and Stable Isotope Composition in the Surface Ocean
dc.contributor.author
Janssen, David J.
dc.contributor.author
Rickli, Jörg
dc.contributor.author
Quay, Paul D.
dc.contributor.author
White, Angelicque E.
dc.contributor.author
Nasemann, Philipp
dc.contributor.author
Jaccard, Samuel L.
dc.date.accessioned
2020-02-05T17:21:12Z
dc.date.available
2020-02-02T14:13:31Z
dc.date.available
2020-02-05T17:21:12Z
dc.date.issued
2020-01
dc.identifier.issn
0886-6236
dc.identifier.issn
1944-9224
dc.identifier.other
10.1029/2019GB006397
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/396520
dc.identifier.doi
10.3929/ethz-b-000396520
dc.description.abstract
While chromium stable isotopes (δ53Cr) have received significant attention for their utility as a tracer of oxygen availability in the distant geological past, a mechanistic understanding of modern oceanic controls on Cr and δ53Cr is still lacking. Here we present total dissolved δ53Cr, concentrations of Cr (III) and total dissolved Cr, and net community productivity (NCP) from the North Pacific. Chromium concentrations show surface depletions in waters with elevated NCP, but not in lower productivity waters. Observed Cr deficits correspond well with calculated Cr export derived from NCP and Cr:C ratios of natural phytoplankton and marine particulates. Chromium (III) concentrations are stable over the diel cycle yet correlate with NCP, with maxima found in highly productive surface waters but not in lower productivity waters, indicating biological control on Cr (III). The relationship between Cr (III) and δ53Cr suggests that δ53Cr distributions may be controlled by the removal of isotopically light Cr (III) at an isotopic enrichment factor (∆53Cr) of −1.08‰ ± 0.25 relative to total dissolved δ53Cr, in agreement with the global δ53Cr‐Cr fractionation factor (−0.82‰ ± 0.05). No perturbation to δ53Cr, Cr, or Cr (III) is observed in oxygen‐depleted waters (~10 μmol/kg), suggesting no strong control by O2 availability, in agreement with other recent studies. Therefore, we propose that biological productivity is the primary control on Cr and δ53Cr in the modern ocean. Consequently, δ53Cr records in marine sediments may not faithfully record oxygen availability in the Late Quaternary. Instead, our data demonstrate that δ53Cr records may be a useful tracer for biological productivity.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
American Geophysical Union
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
Chromium
en_US
dc.subject
chromium redox
en_US
dc.subject
stable isotopes
en_US
dc.subject
biological productivity
en_US
dc.subject
Paleoproxy
en_US
dc.subject
GEOTRACES
en_US
dc.title
Biological Control of Chromium Redox and Stable Isotope Composition in the Surface Ocean
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
ethz.journal.title
Global Biogeochemical Cycles
ethz.journal.volume
34
en_US
ethz.journal.issue
1
en_US
ethz.journal.abbreviated
Glob. biogeochem. cycles
ethz.pages.start
e2019GB006397
en_US
ethz.size
18 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Washington, DC
en_US
ethz.publication.status
published
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erd- und Planetenwissenschaften / Dep. of Earth and Planetary 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. Erd- und Planetenwissenschaften / Dep. of Earth and Planetary Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03956 - Vance, Derek / Vance, Derek
ethz.date.deposited
2020-02-02T14:13:40Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2020-02-05T17:21:22Z
ethz.rosetta.lastUpdated
2023-02-06T18:16:23Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
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