Assessment of C, N, and Si Isotopes as tracers of past ocean nutrient and carbon cycling

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dc.contributor.authorFarmer, J. R.en_ZA
dc.contributor.authorHertzberg, J. E.en_Za
dc.contributor.authorCardinal, D.en_ZA
dc.contributor.authorFietz, S.en_ZA
dc.contributor.authorHendry, K.en_ZA
dc.contributor.authorJaccard, S. L.en_ZA
dc.contributor.authorPaytan, A.en_ZA
dc.contributor.authorRafter, P. A.en_ZA
dc.contributor.authorRen, H.en_ZA
dc.contributor.authorSomes, C. J.en_ZA
dc.contributor.authorSutton, J. N.en_ZA
dc.date.accessioned2023-04-18T09:41:47Z
dc.date.available2023-04-18T09:41:47Z
dc.date.issued2021
dc.descriptionCITATION: Farmer, J. R., Hertzberg, J. E., Cardinal, D., Fietz, S., Hendry, K., Jaccard, S. L., et al. (2021). Assessment of C, N, and Si isotopes as tracers of past ocean nutrient and carbon cycling. Global Biogeochemical Cycles, 35, e2020GB006775. doi.10.1029/2020GB006775en_ZA
dc.descriptionThe original publication is available at: wiley.comen_ZA
dc.description.abstractBiological productivity in the ocean directly influences the partitioning of carbon between the atmosphere and ocean interior. Through this carbon cycle feedback, changing ocean productivity has long been hypothesized as a key pathway for modulating past atmospheric carbon dioxide levels and hence global climate. Because phytoplankton preferentially assimilate the light isotopes of carbon and the major nutrients nitrate and silicic acid, stable isotopes of carbon (C), nitrogen (N), and silicon (Si) in seawater and marine sediments can inform on ocean carbon and nutrient cycling, and by extension the relationship with biological productivity and global climate. Here, we compile water column C, N, and Si stable isotopes from GEOTRACES-era data in four key ocean regions to review geochemical proxies of oceanic carbon and nutrient cycling based on the C, N, and Si isotopic composition of marine sediments. External sources and sinks as well as internal cycling (including assimilation, particulate matter export, and regeneration) are discussed as likely drivers of observed C, N, and Si isotope distributions in the ocean. The potential for C, N, and Si isotope measurements in sedimentary archives to record aspects of past ocean C and nutrient cycling is evaluated, along with key uncertainties and limitations associated with each proxy. Constraints on ocean C and nutrient cycling during late Quaternary glacial-interglacial cycles and over the Cenozoic are examined. This review highlights opportunities for future research using multielement stable isotope proxy applications and emphasizes the importance of such applications to reconstructing past changes in the oceans and climate system.en_ZA
dc.description.versionPublisher’s versionen_ZA
dc.format.extent28 pages : illustrations, mapsen_ZA
dc.identifier.issn0886-6236 (print)en_ZA
dc.identifier.issn1944-9224 (online)en_ZA
dc.identifier.otherdoi.10.1029/2020GB006775en_ZA
dc.identifier.urihttp://hdl.handle.net/10019.1/126793
dc.language.isoen_ZAen_ZA
dc.publisherJohn Wiley & Sons, Inc.en_ZA
dc.rights.holderAuthors retain copyrighten_ZA
dc.subjectStable isotope tracersen_ZA
dc.subjectOcean nutrienten_ZA
dc.subjectCarbon cycle (Biogeochemistry)en_ZA
dc.subjectBiological productivityen_ZA
dc.subjectAtmospheric carbon dioxide -- Climatic factorsen_ZA
dc.subjectPhytoplankton -- Nutritionen_ZA
dc.titleAssessment of C, N, and Si Isotopes as tracers of past ocean nutrient and carbon cyclingen_ZA
dc.typeArticleen_ZA
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