GEOTRACES-Intercalibration studies of Contamination-Prone Trace Element Isotopes

来自麻省理工学院的一位科学家提议参加2008年和2009年夏季GEOTRACES相互校准巡航，以比较/对比使用MITESS微量元素采样器和使用凯夫拉（Kevlar）安装的微量元素玫瑰花形Go-FLO瓶收集的水样。有证据表明，在某些条件下，MITESS取样器可能不太容易受到某些元素的低水平金属污染。此外，他建议协助收集大体积样品（即500升酸化均质表面和深水样品），用于分析和相互校准关键的GEOTRACES微量元素浓度（Fe, Cd, Zn， Cu和Mn）和微量元素同位素比率（Pb, Fe, Zn）。最后，研究人员计划参加一个小组工作，为易受污染的微量元素同位素比率的样本收集和分析建立公开可用的标准协议。就更广泛的影响而言，不同方法的相互校准是GEOTRACES计划的关键第一步，以确保从不同实验室和全球海洋不同部分获得的测量结果可以进行比较/对比，从而进一步了解微量元素的生物地球化学和人为排放对地球的影响。作为该项目的一部分，将支持和培训一名研究生。

ABSTRACTOCE-0751409A scientist from Massachusetts Institute of Technology proposes to participate in the summer 2008 and 2009 GEOTRACES intercalibration cruises to compare/contrast water samples collected using the MITESS trace element sampler versus those collected using the Kevlar mounted and trace element rosette Go-FLO bottles. Evidence suggests the MITESS samplers may be less prone to low-level metal contamination for some elements under certain conditions. In addition, he proposes to aid in the collection of large volume samples (i.e, 500 liter acidified homogenized samples of surface and deepwater) for the analysis and intercalibration of key GEOTRACES trace element concentrations (Fe, Cd, Zn, Cu, and Mn) and trace element isotope ratios (Pb, Fe, Zn). Lastly, the investigators plans to participate in a group effort to establish publicly-available standard protocols for the sample collection and analysis of contamination-prone trace element isotope ratios. As regards broader impacts, intercalibration of different methods is a key first step for the GEOTRACES program to ensure that measurements obtained from different laboratories and various part of the global ocean can be compared/contrasted to further our understanding of the biogeochemistry of trace elements and the impact of anthropogenic emissions on earth. One graduate student would be supported and trained as part of this project.