Calibration of the carbon isotope composition (δ13C) of benthic foraminifera
Schmittner, Andreas (Oregon State University. College of Earth, Ocean and Atmospheric Sciences)
Bostock, Helen (National Institute of Water and Atmospheric Research)
Cartapanis, Olivier (University of Bern. Institute of Geological Sciences and Oeschger Center for Climate Change Research)
Curry, William B. (Bermuda Institute of Ocean Sciences)
Filipsson, Helena L. (Lund University. Department of Geology)
Galbraith, Eric (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Gottschalk, Julia (University of Bern. Institute of Geological Sciences and Oeschger Center for Climate Change Research)
Herguera, Juan Carlos (Centro de Investigación Científica y Educación Superior de Ensenada. México.)
Hoogakker, Babette (Heriot Watt University. Edinburgh)
Jaccard, Samuel L. (University of Bern. Institute of Geological Sciences and Oeschger Center for Climate Change Research)
Lisiecki, Lorraine (University of California. Department of Earth Sciences)
Lund, David C. (University of Connecticut-Avery Point. Department of Marine Sciences)
Martínez Méndez, Gema (University of Bremen. MARUM-Center for Marine Environmental Sciences)
Lynch-Stieglitz, Jean (Georgia Institute of Technology. School of Earth and Atmospheric Sciences)
Mackensen, Andreas (Alfred-Wegener-Institut für Polar- und Meeresforschung)
Michel, Elisabeth (Laboratoire des sciences du climat et de l'environnement (LSCE))
Mix, Alan C. (Oregon State University. College of Earth, Ocean and Atmospheric Sciences)
Oppo, Delia W. (Woods Hole Oceanographic Institution)
Peterson, Carlye D. (University of California. Department of Earth and Planetary Sciences)
Repschläger, Janne (Max Planck Institute for Chemistry. Germany)
Sikes, Elisabeth L. (Rutgers University. Institute of Marine and Coastal Sciences)
Spero, Howard J. (University of California. Department of Earth and Planetary Sciences)
Waelbroeck, Claire (Laboratoire des sciences du climat et de l'environnement (LSCE))

Data:	2017
Resum:	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.
Nota:	Unidad de excelencia María de Maeztu MdM-2015-0552
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Carbon ; Isotopes ; Benthic ; Foraminifera ; Calibration
Publicat a:	Paleoceanography, Vol. 32, issue 6 (June 2017) , p. 512-530, ISSN 1944-9186

DOI: 10.1002/2016PA003072

19 p, 6.1 MB

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