Chemical Characterization and Biogeochemical Cycling of UDOM in Seawater

首席研究员将考虑为什么海水中溶解有机碳(DOC)浓度在全球范围内几乎是不变的这个问题。他最近的研究表明，通过超滤回收的DOC是由一组定义明确的酰化多糖(糖聚合物)组成的，这些多糖似乎来自藻类，在海水中普遍存在。现在，PI将继续详细研究这些多糖在500道尔顿级分的海水中的结构和组成。此外，还将使用放射性碳分析来研究大团聚体将其从表层海洋中清除，并将其运往深海。大部分实地工作将通过参与加州大学欧文分校和弗吉尼亚海洋科学研究所的其他NSF调查人员资助的邮轮进行，这些调查人员目前正在研究深海中的DOC自行车。

ABSTRACTOCE-9818654The principal investigator will consider the question of why dissolved organic carbon (DOC) concentrations in seawater are nearly invariable worldwide. His recent studies indicate that DOC recovered by ultrafiltration is constituted by a well-defined set of acylated polysaccharides (sugar polymers), which appear to be of algal origin and to be ubiquitous in seawater. Now, the PI will continue a detailed study of the structure and composition of these polysaccharides in the 500 Dalton size fraction of seawater. Additionally, radiocarbon assays will be used to study their removal from the surface ocean by macroaggregates and their transport to the deep ocean. Major portions of the field work will be carried out through participation on funded cruises of other NSF investigators at the University of California at Irvine and the Virginia Institute of Marine Science who are currently studying DOC cycling in the deep ocean.