GEOTRACES: Intercalibration of Phosphate Oxygen Isotope Analyses and Sample Processing Techniques

GEOTRACES：磷酸氧同位素分析和样品处理技术的相互校准

• 批准号: 0827122
• 负责人: Albert Colman
• 金额: $ 4.06万
• 依托单位: University of Chicago
• 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: 2008-08-15 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0827122&HistoricalAwards=false
• 关键词: GEOTRACES; Intercalibration; Phosphate; Oxygen; Isotope

The oxygen isotope composition of dissolved phosphate has the utility of tracing sources of this nutrient in continental shelf and upper slope environments, yield insights into remineralization mechanisms in the open ocean, and reveal biological turnover rates of phosphate. However, currently only a few published measurements are available. Inclusion of this parameter into the GEOTRACES Program would significantly enhance the data set but requires that his component be intercalibrated. For this reason, a scientist from the University of Chicago plans to collect and analyze water samples for the oxygen isotope composition of dissolved phosphate during the GEOTRACES intercalibration cruises to the Atlantic and Pacific Ocean. Once the analyses are completed, a set of recommendations on the best practices to obtain reliable measurements would be made accessible to the ocean sciences community. In addition, the researcher proposes to distribute samples and standards for the analysis of oxygen isotope composition of dissolved phosphate.As regards broader impacts, this intercalibration effort could represent a first step towards the development of a new tracer for the ocean sciences community aimed at furthering our understanding of the phosphorus cycle.

溶解磷酸盐的氧同位素组成具有实用性，在大陆架和上斜坡环境中追踪这种营养物质的来源，在开阔的海洋中的再矿化机制的见解，并揭示磷酸盐的生物周转率。 然而，目前只有少数已公布的测量数据可用。 将这一参数纳入GEOTRACES程序将大大增强数据集，但需要对其组成部分进行相互校准。 出于这个原因，芝加哥大学的一位科学家计划在GEOTRACES对大西洋和太平洋进行相互校准航行期间收集和分析水样中溶解磷酸盐的氧同位素组成。 一旦完成分析，将向海洋科学界提供一套关于获得可靠测量结果的最佳做法的建议。 此外，研究人员建议分发样品和标准品，用于分析溶解磷酸盐的氧同位素组成。关于更广泛的影响，这种相互校准努力可能是为海洋科学界开发新的示踪剂的第一步，目的是加深我们对磷循环的了解。