Planktic foraminiferal oxygen isotopes, Mg/Ca and Mg/Ca-derived SST estimates of sediment cores GeoB22230-1 from R/V SONNE expedition SO256 in the Coral Sea offshore NE Australia

Planktic foraminiferal oxygen isotopes, Mg/Ca and Mg/Ca-derived SST estimates of sediment core SO256_30-1 (GeoB22230-1). Oxygen isotope analyses were carried out by the isotope laboratory of MARUM, University of Bremen, on a Finnigan MAT 251 mass spectrometer, which is connected with automatic lines for carbonate preparation. Isotope data were calibrated against the international Vienna Pee Dee Belemnite (VPDB) standard by using an in‐house carbonate standard, which has been calibrated to the National Bureau of Standards 19 standard. The long‐term analytical standard deviation is below ±0.07‰. Sample preparation for Mg/Ca followed the procedure of Barker et al. (2003, doi:10.1029/2003GC000559). Mg/Ca measurements were performed at MARUM, University of Bremen, on an Agilent Technologies 700 Series Inductively Coupled Plasma Optical Emission Spectrophotometer (ICP-OES), which is connected to a Cetax ASX 520 autosampler. To convert Mg/Ca to temperature, we applied the species-specific Mg/Ca-temperature calibration of Anand et al. (2003; doi:10.1029/2002PA000846) with an assumed exponential constant of 0.09.

本数据集包含沉积物岩芯SO256_30-1（GeoB22230-1）的浮游有孔虫氧同位素、Mg/Ca比值及由Mg/Ca比值推算的海表温度（Sea Surface Temperature, SST）估计值。氧同位素分析由不来梅大学MARUM同位素实验室完成，测试仪器为Finnigan MAT 251型质谱仪，该仪器配套有碳酸盐样品前处理自动生产线。同位素数据采用内部碳酸盐标准物质校准至国际维也纳佩迪贝列姆尼特（Vienna Pee Dee Belemnite, VPDB）标准，该内部标准已通过美国国家标准局19号标准定值。长期分析标准偏差小于±0.07‰。Mg/Ca比值分析的样品前处理流程参照Barker等人（2003，DOI: 10.1029/2003GC000559）的方法。Mg/Ca比值测试同样在不来梅大学MARUM实验室完成，使用安捷伦科技700系列电感耦合等离子体光发射光谱仪（Inductively Coupled Plasma Optical Emission Spectrophotometer, ICP-OES），该仪器配套Cetax ASX 520型自动进样器。为将Mg/Ca比值转换为海表温度，本研究采用Anand等人（2003；DOI: 10.1029/2002PA000846）提出的属种特异性Mg/Ca-温度校准公式，并设定指数常数为0.09。