Calibration of the carbon isotope composition (C-13) of benthic foraminifera

Type Article
Date 2017-06
Language English
Author(s) Schmittner AndreasORCID1, Bostock Helen C.2, Cartapanis Olivier3, 4, 5, Curry William B.6, 7, Filipsson Helena L.8, Galbraith Eric D.5, 9, 10, Gottschalk Julia3, 4, Carlos Herguera Juan11, Hoogakker BabetteORCID12, Jaccard Samuel L.3, 4, Lisiecki Lorraine E.13, Lund David C.14, Martinez-Mendez Gema15, Lynch-Stieglitz JeanORCID16, Mackensen AndreasORCID17, Michel Elisabeth18, Mix Alan C.1, Oppo Delia W.7, Peterson Carlye D.19, Repschlaeger Janne20, Sikes Elisabeth L.21, Spero Howard J.19, Waelbroeck Claire18
Affiliation(s) 1 : Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 ,USA.
2 : Natl Inst Water & Atmospher Res, Wellington, New Zealand.
3 : Univ Bern, Inst Geol Sci, Bern, Switzerland.
4 : Univ Bern, Oeschger Ctr Climate Change Res, Bern, Switzerland.
5 : McGill Univ, Dept Earth & Planetary Sci, Montreal, PQ, Canada.
6 : Bermuda Inst Ocean Sci, St Georges, Bermuda.
7 : Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 ,USA.
8 : Lund Univ, Dept Geol, Lund, Sweden.
9 : Univ Autonoma Barcelona, Inst Ciencia & Tecnol Ambientals, Barcelona, Spain.
10 : ICREA, Barcelona, Spain.
11 : Ctr Invest Cient & Educ Super Ensenada, Oceanol, Ensenada, Baja California, Mexico.
12 : Heriot Watt Univ, Lyell Ctr, Edinburgh, Midlothian, Scotland.
13 : Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106, USA.
14 : Univ Connecticut, Dept Marine Sci, Groton, CT ,USA.
15 : Univ Bremen, MARUM Ctr Marine Environm Sci, Bremen, Germany.
16 : Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 ,USA.
17 : Alfred Wegener Inst Polar & Marine Sci, Bremerhaven, Germany.
18 : Lab CNRS CEA UVSQ, LSCE IPSL, Gif Sur Yvette, France.
19 : Univ Calif Davis, Dept Earth & Planetary Sci, Davis, CA 95616, USA.
20 : Max Planck Inst Chem, Mainz, Germany.
21 : Rutgers State Univ, Inst Marine & Coastal Sci, New Brunswick, NJ ,USA.
Source Paleoceanography (0883-8305) (Amer Geophysical Union), 2017-06 , Vol. 32 , N. 6 , P. 512-530
DOI 10.1002/2016PA003072
WOS© Times Cited 47
Keyword(s) carbon, isotopes, benthic, foraminifera, calibration

The carbon isotope composition (C-13) of seawater provides valuable insight on ocean circulation, air-sea exchange, the biological pump, and the global carbon cycle and is reflected by the C-13 of foraminifera tests. Here more than 1700 C-13 observations of the benthic foraminifera genus Cibicides from late Holocene sediments (C-13(Cibnat)) are compiled and compared with newly updated estimates of the natural (preindustrial) water column C-13 of dissolved inorganic carbon (C-13(DICnat)) 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 C-13(Cibnat) and C-13(DICnat), confirming earlier work. Regression analyses indicate significant carbonate ion (-2.60.4)x10(-3)/(molkg(-1)) [CO32-] and pressure (-4.91.7)x10(-5)m(-1) (depth) effects, which we use to propose a new global calibration for predicting C-13(DICnat) from C-13(Cibnat). This calibration is shown to remove some systematic regional biases and decrease errors compared with the one-to-one relationship (C-13(DICnat)=C-13(Cibnat)). 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 sigma 0.25 parts per thousand, with larger values found in the southeast Atlantic and Antarctic (sigma 0.4 parts per thousand) 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 C-13 record.

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Schmittner Andreas, Bostock Helen C., Cartapanis Olivier, Curry William B., Filipsson Helena L., Galbraith Eric D., Gottschalk Julia, Carlos Herguera Juan, Hoogakker Babette, Jaccard Samuel L., Lisiecki Lorraine E., Lund David C., Martinez-Mendez Gema, Lynch-Stieglitz Jean, Mackensen Andreas, Michel Elisabeth, Mix Alan C., Oppo Delia W., Peterson Carlye D., Repschlaeger Janne, Sikes Elisabeth L., Spero Howard J., Waelbroeck Claire (2017). Calibration of the carbon isotope composition (C-13) of benthic foraminifera. Paleoceanography, 32(6), 512-530. Publisher's official version : , Open Access version :