Multitracers to Predict Paleoproductivity in the California Current System from Sediment and Sediment Trap Materials

长期沉积物捕集器的部署提供了一个机会来检查深海沉积物作为近地表海洋过程记录器的保真度。 此类研究很重要，因为古海洋学研究的一个基本假设是，微古生物学和沉积物化学记录可用于检查长期地质时间尺度内海面条件的变化。 目前推荐的奖项将支持对海洋沉积物中“输入”和“保存”关系的多示踪剂研究。 使用稳定同位素、地球化学和微古生物学标准应该可以准确评估沉积物和初始地表水输入之间的差异。 该项目的现场阶段将在加州洋流系统中部署一系列沉积物捕集器，该系统在净生产力和表面海洋学方面具有很强的季节性梯度。 对沉积物捕集器材料和表面沉积物的分析将用于开发一套独立的净生产力指标。 最有可能提供此信息的成分包括：生物、钙质和硅质微化石； 重晶石和生物限制性微量元素，例如铜和锌； 有机物及其某些含氮化合物，包括碘、溴和磷。 这样的分析应该能够准确定义那些与净生物生产力高度相关的信号载体。 主要研究人员非常有资格承担该项目的现场和分析部分，并成功完成了以前的沉积物捕集器项目。 强烈建议按以下水平提供资金： 2087 财年 = 224,750 美元； 88 财年 = $229,615； 89 财年 = 201,299 美元。

Long-term sediment trap deployment provide an opportunity to examine the fidelity of deep-sea sediments as recorders of near- surface oceanic processes. Such studies are important because a fundamental assumption of paleoceanographic research is that the micropaleontologic and sediment chemistry record can be used to examine changes in sea surface conditions over long geologic time scales. The present recommended award will support a multitracer study of the relation of "imput" and "preservation" in marine sediments. The use of stable isotope, geochemical, and micropaleontologic criteria should allow an accurate assessment of differences between deposited sediments and the initial surface water input. The field phase of the project will deploy an array of sediment traps in the California Current system which has strong seasonal gradients in net productivity and surface oceanography. Analyses on the sediment trap material and surface sediments will be used to develop a set of independent proxies for net productivity. Components most likely to provide this information include: biogenous, calcareous, and siliceous microfossils; barite and bio-limiting trace elements such as copper and zinc; and organic matter and certain of its nitrogenous compounds including iodine, bromine, and phosphorous. Such analyses should allow an accurate definition of those signal carriers most highly correlated to net biologic productivity. The principal investigators are highly qualified to undertake the field and analysis portion of the project and have successfully completed previous sediment trap projects. Funding is strongly recommended at the following levels: FY87 = $224,750; FY88 = $229,615; FY89 = $201,299.