How To Measure Dissolved Organic Matter In Seawater

溶解有机碳（DOC）的测量最近获得了新的重要性。地球化学家、生物海洋学家和物理海洋学家在研究全球元素通量和研究生态系统元素循环时使用这个参数。过去，人们认为DOC的分布在海洋中变化不大，代表了生物活动的残余。它们被认为是不太重要的测量参数。在过去的10年里，海洋中明显更高的浓度和随深度的巨大变化引起了人们对DOC的重要性的极大兴趣和兴奋，特别是在海洋-大气碳相互作用方面。由于许多分析人士试图测量DOC，由于报告的浓度差异大到一个数量级，引起了争议。在过去的两年里，这项更新提案的主要研究者一直在尝试解决这一争议；与一个指导委员会和一些经验丰富的分析人员密切合作，为全球海洋通量联合研究中的例行DOC测量提供资金。在协调和裁判的角色中，他已经能够与分析师达成一致，并且变化更多地在+7.5%的范围内，而不是之前的+100%或更多。分析上的一致意见来自对分析空白、方法标准化和二氧化碳峰值测量的仔细关注，而不是来自对浓度和分布的先入为主的想法。目前正在进行一项广泛的社区DOC分析比较，来自美国和其他17个国家的约70名分析人员参与其中。更新提案的努力将：1.)完成DOC社区比较；2)。提供参考资料，使DOC分析保持广泛的社区标准化；和3)。开展样品采集和保存研究，避免微生物活动引起的DOC浓度的零星快速变化。有大量的分析人员对方法比较感兴趣并愿意参与其中，再加上没有直接参与但与主要研究人员有过接触的人数较多，这表明人们对国际海洋学和湖泊学界的兴趣，以及完成拟议项目的紧迫性。

9402859 SHARP The measurement of dissolved organic carbon (DOC) has garnered renewed importance recently. This parameter is used by geochemists, biological oceanographers, and physical oceanographers in studies of global elemental fluxes and studies of ecosystem elemental cycling. In the past, DOC distributions were thought to show little variation in the ocean and to represent refractory remnants of biological activity. They were considered poorly measured parameters of little importance. Demonstrations in the past 10 years of apparently much higher concentrations in the ocean and large variations with depth caused considerable interest and excitement in the importance of DOC, especially in relation to ocean-atmosphere carbon interactions. With many analysts trying to measure DOC, controversy arose because of differences in reported concentrations as large as an order of magnitude. The principal investigator of this renewal proposal has been involved for the past two years with an attempted solution of the controversy; working closely with a steering committee and with a number of experienced analysts funded for routine DOC measurements in the Joint Global Ocean Flux Study. In a coordinator and referee role, he has been able to get agreement among analysts and variations are more on the order of +7.5% instead of the previous +100% or more. This agreement on analysis has come from careful attention to analytical blanks, method standardization, and carbon dioxide peak measurement, not from preconceived ideas of concentrations and distribution. A broad community DOC analytical comparison is now underway with participation by about 70 analysts from the United States and 17 other countries. The effort of the renewal proposal will: 1.) Complete the DOC community comparison; 2.) Make available reference materials to keep broad community standardization for DOC analyses; and 3.) Carry out research on collection and preservation of samples to avoid sporadic rapid changes in DOC concentrations from microbial activity. The large number of analysts interested and willing to participate in the methods comparisons plus a larger number who are not directly involved but who have been in contact with the principal investigator, indicates the interest in the international oceanographic and limnological communities and the urgency to complete the proposed project.