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

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。 分析能力的提高对于了解全球碳通量至关重要，而这是更好地评估全球变化所必需的。此外，在我们迈向21世纪的世纪全球观测系统的过程中，一致的准确分析测量是必不可少的。 随着更好的DOC测量，关于碳分布和通量的新概念已经出现，准确的分析能力将允许在不久的将来进一步了解全球碳循环。 在过去的几年里，DON分析已经取得了一些进展，但在常规基础上进行可靠的测量之前，还需要更多的研究。 在这项研究中，来自特拉华州大学的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必须来自总溶解氮（TDN）和溶解无机氮（DIN）的测量，研究人员将首先解决用于测量TDN和DIN的组合参考物质的制备和使用。 然后，所有可用的湿化学和高温燃烧（HTC）的TDN测量方法将进一步评估。 第三个目的是提高用HTC方法测量DOC和TDN的可靠性。 将为TDN和DIN组合分析制定和测试方案。 该项目的最初步骤将在研究人员实验室与百慕大和夏威夷的全球海洋流量联合研究时序站密切协调下进行。 在该项目后期，将把参考材料和协议提供给国际海洋界，供其采用，并以时间序列台站为标准。 在海洋地球化学领域，很少有标准化的参数。 本项目的目标是使DOC和DON成为其中之一。

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.