Dissolved Organic Matter Composition in the Deep Atlantic Ocean

大西洋深海溶解的有机物成分

• 批准号: 1154320
• 负责人: Elizabeth Kujawinski
• 金额: $ 93.21万
• 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: 2012
• 资助国家: 美国
• 起止时间: 2012-02-15 至 2016-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1154320&HistoricalAwards=false
• 关键词: Dissolved; Organic; Matter; Composition; Deep

Transformations of dissolved organic matter (DOM) in the deep ocean have profound impacts on the global carbon cycle due to the sequestration of carbon dioxide (CO2) away from the atmosphere. Although research has been conducted on the high molecular weight component of this material, the same cannot be said for low molecular weight DOM because the needed analytical techniques have not been available to determine its composition and reactivity. In recent years, a research team at Woods Hole Oceanographic Institution has acquired the necessary analytical capability. As such, in this project, they will carry out the first systematic survey of deep ocean DOM in the western Atlantic Ocean to characterize the low molecular weight fraction of DOM in southward flowing North Atlantic Deep Water (NADW), northward flowing Antarctic Bottom Water (AABW), and Antarctic Intermediate Water (AAIW). Using ultrahigh resolution mass spectrometry and multi-stage fragmentation coupled to liquid chromatography, the scientists will determine the spatial variability in the composition of DOM along the flow path of the water masses, as well as assess the source water, transport, and surface processes that contribute to temporal changes in DOM composition. These results will be augmented with structural elucidation and quantitative assays of unique marker compounds for each water mass. Results will provide important insights into the biogeochemical reactions that govern DOM dynamics in the deep ocean. The broader impacts component of the proposal was well developed. Besides supporting and training one graduate student, as part of their outreach efforts, the proponents plan to develop and teach a new class on ultrahigh resolution mass spectrometry for graduate students and postdocs. This class would provide them with hands-on experience and teach them to run samples on various mass spectrometers. In addition, the proponents plan to create a fund to train students and postdocs on the use of multivariate statistical tools for data processing and interpretation.

深海中溶解有机物（DOM）的转化对全球碳循环产生了深远的影响，这是由于二氧化碳（CO2）远离大气。 尽管已经对该材料的高分子量成分进行了研究，但对于低分子量DOM的研究不能说相同，因为所需的分析技术无法确定其组成和反应性。 近年来，伍兹霍尔海洋学院的一个研究团队获得了必要的分析能力。因此，在这个项目中，他们将对西大西洋的深海DOM进行首次系统调查，以表征向南流动的北大西洋深水（NADW），向北流动的南极底部水（AABW）和南极中间水（AAIW）的低分子量分数。 使用超高分辨率的质谱和多阶段的碎片结合与液相色谱结合，科学家将确定DOM沿水质量的流动路径沿DOM组成的空间变异性，并评估源水，运输和表面过程，从而导致dom成分的时间变化。 这些结果将通过对每个水质量的独特标记化合物的结构阐明和定量测定进行增强。 结果将为控制深海动态的生物地球化学反应提供重要的见解。该提案的更广泛的影响成分得到了很好的发展。 除了支持和培训一名研究生外，作为他们的外展工作的一部分，支持者计划开发和教授有关研究生和博士后超高分辨率质谱的新课程。 该课程将为他们提供动手体验，并教他们在各种质谱仪上运行样本。 此外，支持者计划创建一个基金来培训学生和博士后，以使用多元统计工具进行数据处理和解释。