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    Calibration of the carbon isotope composition (δ13C) of benthic foraminifera

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    Date
    2017-06-03
    Author
    Schmittner, Andreas  Concept link
    Bostock, Helen  Concept link
    Cartapanis, olivier  Concept link
    Curry, William B.  Concept link
    Filipsson, Helena L.  Concept link
    Galbraith, Eric D.  Concept link
    Gottschalk, Julia  Concept link
    Herguera, Juan Carlos  Concept link
    Hoogakker, Babette  Concept link
    Jaccard, Samuel L.  Concept link
    Lisiecki, Lorraine E.  Concept link
    Lund, David C.  Concept link
    Martínez Méndez, Gema  Concept link
    Lynch-Stieglitz, Jean  Concept link
    Mackensen, Andreas  Concept link
    Michel, Elisabeth  Concept link
    Mix, Alan C.  Concept link
    Oppo, Delia W.  Concept link
    Peterson, Carlye D.  Concept link
    Repschläger, Janne  Concept link
    Sikes, Elisabeth L.  Concept link
    Spero, Howard J.  Concept link
    Waelbroeck, Claire  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/9158
    As published
    https://doi.org/10.1002/2016PA003072
    DOI
    10.1002/2016PA003072
    Keyword
     Carbon; Isotopes; Benthic; Foraminifera; Calibration 
    Abstract
    The carbon isotope composition (δ13C) of seawater provides valuable insight on ocean circulation, air-sea exchange, the biological pump, and the global carbon cycle and is reflected by the δ13C of foraminifera tests. Here more than 1700 δ13C observations of the benthic foraminifera genus Cibicides from late Holocene sediments (δ13CCibnat) are compiled and compared with newly updated estimates of the natural (preindustrial) water column δ13C of dissolved inorganic carbon (δ13CDICnat) as part of the international Ocean Circulation and Carbon Cycling (OC3) project. Using selection criteria based on the spatial distance between samples, we find high correlation between δ13CCibnat and δ13CDICnat, confirming earlier work. Regression analyses indicate significant carbonate ion (−2.6 ± 0.4) × 10−3‰/(μmol kg−1) [CO32−] and pressure (−4.9 ± 1.7) × 10−5‰ m−1 (depth) effects, which we use to propose a new global calibration for predicting δ13CDICnat from δ13CCibnat. This calibration is shown to remove some systematic regional biases and decrease errors compared with the one-to-one relationship (δ13CDICnat = δ13CCibnat). However, these effects and the error reductions are relatively small, which suggests that most conclusions from previous studies using a one-to-one relationship remain robust. The remaining standard error of the regression is generally σ ≅ 0.25‰, with larger values found in the southeast Atlantic and Antarctic (σ ≅ 0.4‰) and for species other than Cibicides wuellerstorfi. Discussion of species effects and possible sources of the remaining errors may aid future attempts to improve the use of the benthic δ13C record.
    Description
    Author Posting. © American Geophysical Union, 2017. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 32 (2017): 512–530, doi:10.1002/2016PA003072.
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    • Geology and Geophysics (G&G)
    Suggested Citation
    Paleoceanography 32 (2017): 512–530
     

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