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

Schmittner, A., Bostock, H. C., Cartapanis, O., Curry, W. B., Filipsson, H. L., Galbraith, E. D., et al. (2017). Calibration of the carbon isotope composition (δ13C) of benthic foraminifera. Paleoceanography, 32(6), 512-530. doi:10.1002/2016PA003072.

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Schmittner, Andreas1, Author
Bostock, Helen C.1, Author
Cartapanis, Olivier1, Author
Curry, William B.1, Author
Filipsson, Helena L.1, Author
Galbraith, Eric D.1, Author
Gottschalk, Julia1, Author
Carlos Herguera, Juan1, Author
Hoogakker, Babette1, Author
Jaccard, Samuel L.1, Author
Lisiecki, Lorraine E.1, Author
Lund, David C.1, Author
Martinez-Mendez, Gema1, Author
Lynch-Stieglitz, Jean1, Author
Mackensen, Andreas1, Author
Michel, Elisabeth1, Author
Mix, Alan C.1, Author
Oppo, Delia W.1, Author
Peterson, Carlye D.1, Author
Repschläger, Janne2, Author              
Sikes, Elisabeth L.1, AuthorSpero, Howard J.1, AuthorWaelbroeck, Claire1, Author more..
Affiliations:
1external, ou_persistent22              
2Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_2237635              

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 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.

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Language(s): eng - English
 Dates: 2017
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000405638700001
DOI: 10.1002/2016PA003072
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Title: Paleoceanography
Source Genre: Journal
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Publ. Info: Washington, DC : American Geophysical Union
Pages: - Volume / Issue: 32 (6) Sequence Number: - Start / End Page: 512 - 530 Identifier: ISSN: 0883-8305
CoNE: https://pure.mpg.de/cone/journals/resource/954925549330