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

在过去的十年里，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理解全球碳通量至关重要，而全球碳通量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、准确的分析测量也是至关重要的。随着DOC测量的改进，出现了关于碳分布和通量的新概念，准确的分析能力将使人们能够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)的测量中获得，研究人员将首先讨论TDN和DIN测量的组合标准物质的制备和使用。然后，对所有可用的湿化学法和高温燃烧法(HTC)进行了进一步的评价。第三个目标是提高HTC方法测量DOC和TDN的可靠性。将为TDN和DIN的组合分析开发和测试协议。该项目的初步步骤将在研究人员实验室与百慕大和夏威夷的全球海洋通量联合研究时间序列站(BATS)和夏威夷(HOT)的密切协调下进行。在项目后期，参考材料和议定书将推广到国际海洋界，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。这个项目的目标是让DOC和DON成为其中的一员。

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.