Collaborative Research: Paired Neodymium Isotope and Radiocarbon Analyses in Deep-Sea Corals - Calibration of a Novel Ocean Ventilation Tracer

合作研究：深海珊瑚中的配对钕同位素和放射性碳分析 - 新型海洋通风示踪剂的校准

• 批准号: 0622872
• 负责人: Laura Robinson
• 金额: --
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0622872&HistoricalAwards=false
• 关键词: Collaborative; Research; Paired; Neodymium; Isotope

Collaborative Research: Paired Neodymium Isotope and Radiocarbon Analyses in Deep-Sea Corals Calibration of a Novel Ocean Ventilation TracerOcean ventilation rates describe the time since a deep water mass last was in contact with the atmosphere. Understanding and constraining this time in the modern and past ocean is of major importance, as the formation of deep waters at high latitudes involves carbon exchange with the atmosphere thereby exerting a key influence on climate. The research proposed here will develop a novel method for determining past ocean ventilation rates: paired neodymium (Nd) isotope and radiocarbon (14C) measurements from deep-sea corals. Radiocarbon measurements in U-series dated deep-sea corals have been successfully used to constrain the radiocarbon content of the deep ocean during the last deglaciation, but without knowing the mixing ratio of different water masses we cannot convert radiocarbon data to ocean ventilation rates. Different water masses in the ocean are characterized by distinct Nd isotopic compositions, whose values are ultimately controlled by regional continental weathering, erosion, and particle-seawater interaction. Therefore this proxy will be used as a quasi-conservative water-mass-mixing tracer.In this project, the PIs will evaluate whether different species of modern deep-sea corals record the Nd isotopic composition of ambient deep water, and whether fossil corals preserve this Nd isotope signature. These data have the potential to produce a new method for accurately determining past ocean ventilation rates. The results of this multiproxy approach have the potential to provide links between ocean ventilation, the carbon cycle, and climate change for researchers studying a broad array of questions in the fields of carbonate chemistry, geochemical cycling in the ocean, the global carbon cycle and paleoceanography. Undergraduate students on summer internships will be introduced to the fields of paleoceanography and geochemistry through discrete projects involving analytical measurements in modern and fossil deep-sea corals.

协作研究：对新型海洋通风tracerocean通气率的深海珊瑚校准中的成对的新近镁同位素和放射性碳分析描述了自上次深水质量以来的时间。在现代和过去的海洋中，理解和限制这段时间至关重要，因为高纬度的深水形成涉及与气氛的碳交换，从而对气候产生了关键的影响。此处提出的研究将开发一种新的方法来确定过去的海洋通风率：配对的肾上飞机（ND）同位素和放射性碳（14C）测量深海珊瑚。在上一场脱气过程中，已成功使用了日期为深海珊瑚的U系列的放射性碳测量值，以限制深海的放射性碳含量，但在不知道不同水质量的混合率的情况下，我们无法将放射性碳数据转化为海洋葡萄发生率。海洋中的不同水块的特征是不同的同位素组成，其值最终由区域大陆风化，侵蚀和颗粒 - 盐水相互作用控制。因此，该代理将用作准保存的水质混合示踪剂。在该项目中，PIS将评估不同种类的现代深海珊瑚是否记录了环境深水的ND同位素组成，以及化石珊瑚是否保留此ND同位素签名。这些数据有可能产生一种新方法来准确确定过去的海洋通风率。这种多重方法的结果有可能为研究人员在碳酸盐化学领域，海洋中的地球化学循环，全球碳循环和古代摄影学领域的广泛问题之间提供海洋通风，碳循环和气候变化之间的联系。暑期实习生的本科生将通过涉及现代和化石深海珊瑚的分析测量的离散项目介绍古文化和地球化学领域。