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

摘要本研究将对海洋颗粒物的234 /POC比值进行约束，该比值已被广泛用于评估海洋表层碳输出通量。该提案的目标是收集来自墨西哥湾的不同大小的有机物组分，量化多糖富集的海洋聚集体与Th（IV）缺乏之间的关系，进行实验室实验研究Th（IV）与单个类别的有机化合物的相互作用，并基于有机物质的性质构建改进的Th（IV）清除模型。实验和模型结果将用于加强对234 /POC比值的使用，以确定来自海洋表面的颗粒有机碳通量。

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.