Isotopic analysis of oxygen and carbon in the epifaunal benthic foraminifera

The dataset includes five parts: Core data, Ventilation age, C. wuellerstorfi δ¹⁸O, C.suellerstorfi δ¹³C, and Sea water δ¹⁸O. For δ¹⁸O and δ¹³C analysis, 3-5 specimens of the epifaunal benthic foraminifera <i>C. wuellerstorfi</i> were selected from the &gt;150 µm fraction. All results are referenced against the PeeDee belemnite (PDB) and further calibrated using the National Bureau of Standards (NBS) 19. The analytical standard deviation stands at approximately ± 0.07 ‰. For AMS¹⁴C dating, 7–10 mg of well-preserved specimens of the planktic foraminifera <i>N. pachyderma</i> and 3–4 mg of the epifaunal benthic foraminifera <i>C. wuellerstorfi</i> were selected from the &gt;150 μm fraction at core depths of 0–1 and 3–4 cm. The ¹⁴C-ventilation age has been outlined as the conventional ¹⁴C disparity observed between benthic and planktic foraminifera. The bottom seawater δ¹⁸O (δ¹⁸O_sw), expressed in permil relative to Standard Mean Ocean Water (SMOW), was computed from the equilibrium δ¹⁸O of <i>C. wuellerstorfi</i>.

本数据集共包含五个组成部分：核心数据、通风年龄、伍氏卷虫（C. wuellerstorfi）δ¹⁸O、苏尔卷虫（C. suellerstorfi）δ¹³C以及海水δ¹⁸O。针对δ¹⁸O与δ¹³C分析，研究人员从粒径大于150 μm的组分中选取3~5枚表生底栖有孔虫伍氏卷虫（C. wuellerstorfi）标本。所有分析结果均以佩迪箭石（PDB）为基准，并通过美国国家标准局（NBS）19号标准物质进行进一步校准，分析标准偏差约为±0.07 ‰。针对加速器质谱（AMS）¹⁴C测年，研究人员从岩心深度0~1 cm与3~4 cm处的粒径大于150 μm的组分中，分别选取7~10 mg保存完好的浮游有孔虫厚壳新抱球虫（N. pachyderma）标本，以及3~4 mg的表生底栖有孔虫伍氏卷虫（C. wuellerstorfi）标本。此处的¹⁴C通风年龄定义为底栖与浮游有孔虫间的常规¹⁴C差值。底层海水δ¹⁸O（记为δ¹⁸O_sw）以相对于标准大洋水（SMOW）的千分比值表示，其数值通过伍氏卷虫（C. wuellerstorfi）的平衡氧同位素δ¹⁸O计算得到。