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

Détails

Ressource 1Télécharger: Farmer et al., 21.pdf (2756.02 [Ko])
Etat: Public
Version: de l'auteur
Licence: CC BY-NC 4.0
ID Serval
serval:BIB_B2C144DF51F7
Type
Article: article d'un périodique ou d'un magazine.
Sous-type
Synthèse (review): revue aussi complète que possible des connaissances sur un sujet, rédigée à partir de l'analyse exhaustive des travaux publiés.
Collection
Publications
Institution
Titre
Assessment of C, N and Si isotopes as tracers of past ocean nutrient and carbon cycling
Périodique
Global Biogeochemical Cycles
Auteur(s)
Farmer J. R., Hertzberg J. E., Cardinal D., Fietz S., Hendry K., Jaccard S. L., Paytan A., Rafter P. A., Ren H., Somes C. J., Sutton J. N.
ISSN
0886-6236
1944-9224
Statut éditorial
Publié
Date de publication
22/05/2021
Langue
anglais
Résumé
Biological 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.
Mots-clé
Atmospheric Science, Global and Planetary Change, General Environmental Science, Environmental Chemistry
Open Access
Oui
Création de la notice
03/07/2021 6:57
Dernière modification de la notice
04/07/2021 6:11
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