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

机译:校准碳同位素组合物(C-13)的底栖菌

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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.
机译:海水的碳同位素组成(C-13)为海洋循环,海运交换,生物泵和全球碳循环提供有价值的见解,并由Foraminifera测试的C-13反映。这里的1700多个C-13观察来自全新烯沉积物(C-13(C-13))的底栖类氨基酯类直霉(C-13(C-13)),并与新更新的天然(预生产)水柱C-13的溶解无机碳( C-13(DICNAT))作为国际海洋循环和碳循环(OC3)项目的一部分。使用基于样品之间的空间距离的选择标准,我们在C-13(CIBNAT)和C-13(DICNAT)之间找到了高相关,确认了早期的工作。回归分析表明,显着的碳酸根离子(-2.60.4)×10(-3)/(molkg(-1))和压力(-4.91.7)x10(-5)m(-1)(深度)我们用于从C-13(CIBNAT)预测C-13(DICNAT)的新全局校准的效果。与一对一关系相比,该校准显示出除去一些系统的区域偏差并降低误差(C-13(DICNAT)= C-13(CIBNAT))。然而,这些效果和错误减少相对较小,这表明来自以前的研究的最多的结论使用一对一关系仍然是强大的。回归的剩余标准误差通常是Sigma 0.25份每千份,在东南大西洋和南极(Sigma 0.4份)中发现更大的值,除了Cibicides WublerStorfi以外的物种。讨论物种效应和剩余误差可能的来源可能有助于未来的尝试改善必要的C-13记录的使用。

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