Assessing the Fidelity of Foraminiferal Mg/Ca- d18O to Estimate Seawater d18Or: A Multispecies Calibration-Validation Study

评估有孔虫 Mg/Ca- d18O 估算海水 d18Or 的保真度：多物种校准验证研究

• 批准号: 0752649
• 负责人: Peter DeMenocal
• 金额: $ 34.34万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-03-01 至 2012-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0752649&HistoricalAwards=false
• 关键词: Assessing; Fidelity; Foraminiferal; Mg; Ca

This project will calibrate and validate shell-derived d18Oseawater estimates that have been derived from paired analyses of Mg/Ca and d18O in planktonic foraminifera against observed d18Oseawater gradients for three meridional coretop transects in the (sub)tropical Pacific, Atlantic, and NW African margin. In addition, an in situ d18Oseawater calibration will be conducted using plankton tow and d18Oseawater surface water samples collected during a recent coring cruise off the Portuguese and NW African margins. The research will test the hypothesis that the "excess Mg/Ca" that he has observed in a series of 58 coretop samples, and its apparent link to salinity, can be isolated and quantified over a larger (sub)tropical ocean domain. This research will also examine systematic changes in foraminifera shell morphology, weight, and shell Mg/Ca heterogeneity associated with "excess Mg/Ca" endmember samples. The Broader Impacts component of this project include support of a PhD student, involvement and mentoring of undergraduate students in elements of the research, and the study of a transformative-level problem that is a fundamental component of many ongoing paleoceanographic research programs.

该项目将校准和验证壳源的D18oseawater估计值，这些估计值是从MG/CA和D18O的配对分析中得出的，这是针对观察到的D18oseawater梯度的D18oseawater梯度的三个子午线旋转梯度的（亚）热带太平洋，属于（亚）的Pacific Pacific，Atlantic atlantic antlantic和Nw African Margin。此外，将使用浮游生物拖曳和D18oseawater的地表水样品进行原位D18oseawater校准，在最近一次的加动物巡游中收集的葡萄牙和西北非洲边缘。这项研究将检验以下假设：他在一系列58个Coretop样品中观察到的“过量MG/CA”，并且可以在较大的（亚）热带海洋域上分离和量化其与盐度的明显联系。这项研究还将检查与“多余的mg/ca”末端样品相关的有孔虫壳形态，重量和壳Mg/ca异质性的系统变化。该项目的更广泛的影响包括支持博士生的支持，本科生参与研究要素的参与和指导，以及研究的变革性问题，这是许多正在进行的古环学研究计划的基本组成部分。