High-resolution Cd isotope systematics in multiple zones of the Southern Ocean from the Antarctic Circumnavigation Expedition

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dc.contributor.authorSieber, M.
dc.contributor.authorConway, Tim.M
dc.contributor.authorde Souza, Gregory F.
dc.contributor.authorHassler, Christel S
dc.contributor.authorEllwood, Michael
dc.contributor.authorVance, Derek
dc.date.accessioned2020-07-21T00:10:13Z
dc.date.issued2019
dc.date.updated2020-04-12T08:20:24Z
dc.description.abstractThe Southern Ocean plays a major role in determining the global distribution of trace metals such as cadmium (Cd). Here, we present 17 high-depth-resolution profiles of dissolved Cd and its stable isotope composition (Cd) over the top 1000 m of the Pacific and Atlantic sectors of the Southern Ocean, collected during the Antarctic Circumnavigation Expedition. Our dataset reinforces the view that Cd and its isotopes are dominated by shallow biological cycling in this region. A close examination of variations in Cd cycling across the different zones of the Southern Ocean reveals how the interplay between uptake and regeneration, seasonal mixing, and upwelling controls both Cd and Cd in this region. The only deviations from these systematics are due to the influence of local processes such as continental influence or Fe-fertilization, close to the Mertz Glacier and the Balleny Islands, respectively. Deep convection during winter incorporates the Southern Ocean Cd isotope signatures into Subantarctic Mode Water and Antarctic Intermediate Water during water mass formation. Incorporating published data, we present the first complete picture of how Cd is cycled through the entire Pacific Ocean, revealing the manner in which the Southern Ocean controls the global cycling of Cd and Cd; analogous to Si or Zn, we propose that Southern Ocean processes, in combination with global ocean circulation, cause a division into two separate Cd regimes, a Cd-depleted surface ocean above a Cd-rich deep ocean loop. Therefore, the relationship between Cd and PO4 on a global scale is largely a result of these processes in the Southern Ocean, rather than a local correlation between the two elements.
dc.format.mimetypeapplication/pdfen_AU
dc.identifier.issn0012-821Xen_AU
dc.identifier.urihttp://hdl.handle.net/1885/206413
dc.language.isoen_AUen_AU
dc.publisherElsevieren_AU
dc.rights© 2019 Elsevier B.V.en_AU
dc.sourceEarth and Planetary Science Lettersen_AU
dc.titleHigh-resolution Cd isotope systematics in multiple zones of the Southern Ocean from the Antarctic Circumnavigation Expeditionen_AU
dc.typeJournal articleen_AU
local.bibliographicCitation.lastpage13en_AU
local.bibliographicCitation.startpage1en_AU
local.contributor.affiliationSieber, M., ETH Zurichen_AU
local.contributor.affiliationConway, Tim.M, University of South Floridaen_AU
local.contributor.affiliationde Souza, Gregory F., ETH Zurichen_AU
local.contributor.affiliationHassler, Christel S, University of Genevaen_AU
local.contributor.affiliationEllwood, Michael, College of Science, ANUen_AU
local.contributor.affiliationVance, Derek, ETH Zurichen_AU
local.contributor.authoremailu4346971@anu.edu.auen_AU
local.contributor.authoruidEllwood, Michael, u4346971en_AU
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor040502 - Chemical Oceanographyen_AU
local.identifier.absseo961104 - Physical and Chemical Conditions of Water in Marine Environmentsen_AU
local.identifier.ariespublicationu5786633xPUB1363en_AU
local.identifier.citationvolume527en_AU
local.identifier.doi10.1016/j.epsl.2019.115799en_AU
local.identifier.thomsonIDWOS:000491609700013
local.identifier.uidSubmittedByu5786633en_AU
local.publisher.urlhttps://www.elsevier.com/en-auen_AU
local.type.statusPublished Versionen_AU

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