Foraminifera as a proxy for seawater neodymium: Core-top calibration and down-core application for reconstructing Holocene variability in the Indonesian Throughflow (ITF)

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。这项研究将评估有孔虫中测量的Nd同位素（定义为#949;Nd）作为水体代理的效用。这项工作的第一个组成部分是一项校准研究，利用过去几年在世界各地的几次航行中收集的大量表层沉积物和上覆水样品，评估有孔虫作为深海和温跃层记录器的适用性。在此基础上，利用新方法重建全新世北太平洋中层水（NPIW）和南太平洋中层水（SPW）对ITF的相对贡献。为了记录ITF及其端元内水团的#949;Nd特征，将在ITF路线和南太平洋内的关键位置测量三个垂直剖面中的海水#949;Nd。PI将生成低分辨率有孔虫记录ε Nd在整个全新世的核心位于马卡萨尔海峡作为水团变化的代理，并结合联合收割机它与测量的可分选的淤泥的平均大小作为代理的底层流速。这项工作将增进对印度尼西亚海域水体变化和温跃层流动的全新世变化的了解。该奖项支持博士后研究员。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).This research will assess the utility of Nd-isotopes(defined as εNd) measured in foraminifera as a water mass proxy. The first component of the work is a calibration study that takes advantage of a large set of surface sediments and overlying water samples collected on several cruises worldwide over the past few years to assess the applicability of foraminifera as recorders of deep ocean and thermocline εNd. Rare earth element patterns will be measured on the same samples to test their utility for paleoceanographic research.The new method will then be used to reconstruct Holocene variability in the relative contributions of North Pacific Intermediate Water (NPIW) and South Pacific Water (SPW) to the ITF. Seawater εNd will be measured in three vertical profiles from key locations within the ITF route and south Pacific in order to document the εNd signatures of water masses within the ITF and its end-members. The PIs will generate a low-resolution foraminiferal record of εNd throughout the Holocene in a core located in the Makassar Straits as a proxy for water mass variability, and combine it with measurements of sortable silt mean size as proxy for bottom current velocity. The work will improve understanding of Holocene changes in water mass variability and thermocline flow through the Indonesian Seas. This award supports a postdoctoral researcher.