A Collaborative Proposal on the Interaction of TH(IV) with Organic Compound Classes of Marine Organic Matter

ABSTRACTOCE-9906823这项工作将限制海洋颗粒物的第234/POC比率，该比率已被广泛用于评估表层海洋的碳出口通量。该提案的目的是收集墨西哥湾不同大小的有机质，量化富含多糖的海洋聚集体与Th(IV)缺乏之间的关系，进行实验室实验以研究Th(IV)与不同类别有机化合物的相互作用，并根据有机物质的性质构建改进的Th(IV)清除模型。实验和模型结果将被用来加强第234/POC比率在确定表层海洋颗粒有机碳通量方面的使用。

ABSTRACTOCE-9906823 This work will constrain the 234Th/POC ratio of marine particulate matter which has been used extensively to evaluate the export flux of carbon from the surface ocean. The objectives of the proposal are to collect various size fractions of organic matter from the Gulf of Mexico and to quantify the relationship between polysaccharide enriched marine aggregates and Th(IV) deficiency, to conduct laboratory experiments to investigate the interactions of Th(IV) with individual classes of organic compounds, and to construct an improved scavenging model of Th(IV) based on the nature of the organic material. Experimental and model results would be used to enhance the use of the 234Th/POC ratio for the determination of particulate organic carbon flux from the surface ocean.