Improved Accuracy and Precision of Dissolved Organic Nitrogen and Inorganic Nitrogen in Seawater

提高海水中溶解有机氮和无机氮的准确度和精密度

• 批准号: 0352280
• 负责人: Jonathan Sharp
• 金额: --
• 依托单位: University of Delaware
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-04-01 至 2008-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0352280&HistoricalAwards=false
• 关键词: Improved; Accuracy; Precision; Dissolved; Organic

ABSTRACTOCE-0352280In the past decade, the international oceanographic community has demonstrated the ability for accurate measurements of dissolved organic carbon (DOC) in the ocean. The improved analytical ability is critical for understanding global carbon fluxes, which are needed to better assess global change. Also, consistent accurate analytical measurements are essential as we move toward the Twenty-first Century global observing systems. With better DOC measurements, new concepts have arisen regarding carbon distributions and fluxes, and accurate analytical capabilities will allow for additional understanding of the global carbon cycle in the near future. In the past several years, some progress has been made with DON analysis, but more research is needed before reliable measurements can be made on a routine basis. In this study, a researcher from the University of Delaware will improve the reliability and accuracy of the measurement of dissolved organic nitrogen (DON) in seawater. Recognizing that DON must be derived from the measurements of total dissolved nitrogen (TDN) and dissolved inorganic nitrogen (DIN), the researchers will first address the preparation and use of combined reference materials for measurement of TDN and DIN. Then, all available wet chemical and high temperature combustion (HTC) methods for TDN measurement will be further evaluated. A third objective is to improve reliability of measuring DOC and TDN by HTC methods. Protocols will be developed and tested for combined TDN and DIN analysis. The initial steps of the project will be made with close coordination between the researcher's laboratory and the Joint Global Ocean Flux Study time series stations in Bermuda (BATS) and Hawaii (HOT). Later in the project, reference materials and protocols will be extended to the international marine community for adoption using the time series stations as the norm. There are very few parameters in the field of marine biogeochemistry with documented standardization. The goal of this project is to make DOC and DON among them.

在过去的十年中，国际海洋学界已经证明了精确测量海洋中溶解有机碳（DOC）的能力。提高分析能力对于了解全球碳通量至关重要，这是更好地评估全球变化所必需的。此外，在我们迈向21世纪全球观测系统的过程中，一致准确的分析测量是必不可少的。有了更好的DOC测量，关于碳分布和通量的新概念出现了，准确的分析能力将使我们在不久的将来对全球碳循环有更多的了解。在过去几年中，DON分析取得了一些进展，但在常规基础上进行可靠的测量之前，还需要进行更多的研究。在这项研究中，特拉华大学的一名研究人员将提高海水中溶解有机氮（DON）测量的可靠性和准确性。认识到DON必须从总溶解氮（TDN）和溶解无机氮（DIN）的测量中得出，研究人员将首先解决TDN和DIN测量的组合参考物质的制备和使用。然后，将进一步评估所有可用的湿化学和高温燃烧（HTC）测量TDN的方法。第三个目标是提高用HTC方法测量DOC和TDN的可靠性。将开发和测试用于TDN和DIN联合分析的协议。该项目的最初步骤将在研究人员的实验室与设在百慕大和夏威夷的全球海洋通量联合研究时间序列站密切协调下进行。在项目后期，将向国际海洋界提供参考材料和议定书，以时间序列站为标准加以采用。在海洋生物地球化学领域，有文献记载的标准化参数很少。这个项目的目标是将DOC和DON纳入其中。