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

ABSTRACTOCE-0352280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。 提高的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，当我们迈向二十一世纪的全球观测系统时，一致的精确分析测量也至关重要。 随着更好的 DOC 测量，关于碳分布和通量的新概念已经出现，准确的分析能力将有助于在不久的将来进一步了解全球碳循环。 在过去的几年中，DON 分析取得了一些进展，但在常规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 的组合参考材料的制备和使用问题。 然后，将进一步评估用于 TDN 测量的所有可用湿化学和高温燃烧 (HTC) 方法。 第三个目标是提高 HTC 方法测量 DOC 和 TDN 的可靠性。 将开发和测试 TDN 和 DIN 组合分析的协议。 该项目的初始步骤将在研究人员实验室与百慕大（BATS）和夏威夷（HOT）的全球海洋通量联合研究时间序列站之间的密切协调下进行。 在该项目后期，参考材料和协议将扩展到国际海洋界，以供以时间序列站为标准采用。 在海洋生物地球化学领域，有记录的标准化参数非常少。 该项目的目标是将DOC和DON纳入其中。

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.