Neodymium isotopic compositions of glacial, deglacial, and Holocene aged deep-sea corals collected from the Drake Passage of the Southern Ocean

This dataset comprises neodymium (Nd) isotopic compositions measured on 145 samples of aragonitic deep-sea corals from the Drake Passage of the Southern Ocean. Most of the samples were previously collected on expeditions NBP0805 and NBP1103 on the RV Nathaniel B. Palmer. The samples include glacial, deglacial and Holocene aged specimens and most are from 0-40 ka BP (thousand years before present) based on uranium-thorium dating. Neodymium isotope analyses were conducted by either thermal ionisation mass spectrometry (TIMS) or multi-collector inductively-coupled plasma mass spectrometry (MC-ICP-MS) in the MAGIC laboratories at Imperial College London by David Wilson, Torben Struve and Tina van de Flierdt. In the modern ocean, dissolved Nd isotopes are a quasi-conservative water mass tracer, while past compositions of seawater are recorded in deep-sea corals. This dataset therefore provides evidence on the proportions of Atlantic versus Pacific waters admixed in the Southern Ocean through time, which places crucial constraints on global deep water chemistry and circulation dynamics during past climate events. Funding was provided by the NERC grant NE/N001141/1. Related datasets are associated with grant NE/N003861/1. Both grants funded the project "Bridging the Timing Gap: Connecting Late Pleistocene Southern Ocean and Antarctic Climate Records".

本数据集包含从南大洋德雷克海峡采集的145份文石质深海珊瑚样品的钕（neodymium, Nd）同位素组成数据。绝大多数样品此前由“内森尼尔·B·帕尔默号”（RV Nathaniel B. Palmer）科考船在NBP0805与NBP1103航次中采集。样品涵盖冰期、冰消期及全新世标本，其中大部分的年代经铀钍测年确定为距今0~40千年前（ka BP）。钕同位素分析由David Wilson、Torben Struve与Tina van de Flierdt在伦敦帝国理工学院MAGIC实验室完成，分析方法采用热电离质谱仪（thermal ionisation mass spectrometry, TIMS）或多接收器电感耦合等离子体质谱仪（multi-collector inductively-coupled plasma mass spectrometry, MC-ICP-MS）。在现代海洋中，溶解态钕同位素属于准保守性水团示踪剂，而古海水的钕同位素组成可通过深海珊瑚得以记录。因此，本数据集可为揭示南大洋不同时期大西洋与太平洋水团的混合比例提供实证依据，进而为过去气候事件期间的全球深水化学与环流动力学研究提供关键约束。本研究得到英国自然环境研究理事会（Natural Environment Research Council, NERC）资助项目NE/N001141/1的支持；相关数据集关联资助项目NE/N003861/1，两项资助均支持了项目“填补时间差：衔接晚更新世南大洋与南极气候记录”（Bridging the Timing Gap: Connecting Late Pleistocene Southern Ocean and Antarctic Climate Records）。