Sharpening Geochemical Tools for Assessing Oceanic Biological Production: Exploring the Limits of Oxygen/Argon Ratios and Triple Oxygen Isotopes

改进评估海洋生物生产的地球化学工具：探索氧/氩比和三氧同位素的极限

• 批准号: 1029676
• 负责人: Rachel Stanley
• 金额: $ 39.29万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1029676&HistoricalAwards=false
• 关键词: Sharpening; Geochemical; Tools; Assessing; Oceanic

Net community production (NCP) and gross primary production (GPP) are two key processes in the marine carbon cycle which can be quantified in situ using triple oxygen isotopes (TOI) and continuous measurements of O2/Ar. Unfortunately, two key issues involved with measuring and interpreting TOI and O2/Ar data remain unresolved, namely, measurement uncertainty and spatial variability. A scientist from Woods Hole Oceanographic Institution plans to carry out an intercalibration effort between eight laboratories worldwide to address whether differences in TOI signatures observed between sample sites are results of real differences in the oceanic isotopic signature of oxygen or whether they are measurement artifacts. As part of the intercalibration, a suite of gas, homogenized water, equilibrated water, and seawater samples will be distributed to the laboratories to assess each step of the measurement process. In addition, the researcher will participate in a cruise of opportunity to examine the spatial variability in TOI and O2/Ar ratios and to determine the causes for this variability. To accomplish this goal, several grid surveys of continuous surface ocean O2/Ar measurements from an equilibrator inlet mass spectrometer (EIMS) and high resolution TOI sampling will be conducted. A video plankton recorder (VPR-II) will be towed on the cruise to continuously measure profiles of O2, plankton and seston abundance, temperature, salinity, fluorescence, photosynthetically available radiation, and turbidity in the upper 150 m of the water column. Various statistical estimators (co-spectra, wavelets, probability density functions) will be used to investigate linkages between hydrographic properties, biogeochemical properties, O2/Ar ratios, and TOI. This work, which will be the first to combine an EIMS and the VPR-II, will quantify spatial variability on scales from two to one thousand kilometers.As regards broader Impacts, as a result of this intercalibration effort, tried and tested biogeochemical tracers for determining in situ gross primary productivity and net carbon productivity would be available to the marine sciences community. One graduate student would be supported and trained as part of this project.

净社区生产（NCP）和总生产总生产（GPP）是海洋碳循环中的两个关键过程，可以使用三重氧同位素（TOI）（TOI）和O2/AR的连续测量进行原位量化。 不幸的是，测量和解释TOI和O2/AR数据涉及的两个关键问题仍未解决，即测量不确定性和空间变异性。 伍兹孔海洋学机构的一名科学家计划在全球八个实验室之间进行互校校准工作，以解决样本位点之间观察到的TOI特征的差异是否是氧气的海洋同位素特征的实际差异的结果，还是它们是测量工件。 作为插图的一部分，将将一组气体，同质水，平衡水和海水样品分布到实验室中，以评估测量过程的每个步骤。 此外，研究人员将参加一次机会，以检查TOI和O2/AR比率的空间变异性，并确定这种变异性的原因。 为了实现这一目标，将对从平衡器入口质谱仪（EIMS）和高分辨率TOI采样进行连续表面海洋O2/AR测量进行了几次网格调查。 视频浮游生物记录仪（VPR-II）将在巡航上拖曳，以连续测量O2，浮游生物和塞斯顿丰度，温度，盐度，荧光，光合作用的辐射以及水柱上150 m的涡轮性。 各种统计估计器（共谱，小波，概率密度函数）将用于研究水文特性，生物地球化学性质，O2/AR比和TOI之间的联系。 这项工作将是第一个结合EIM和VPR-II的工作，它将量化两次到千公里的空间可变性。由于这种相互启动的工作，对广泛的影响进行了更广泛的影响。 作为该项目的一部分，将为一名研究生提供支持和培训。