The Preservation and Accumulation of Biogenic Silica and Organic Carbon in an High-Latitude Environment: The Ross Sea

该项目是对沉积速率研究的更新， 海底再生和沉积物中生物硅的积累 罗斯海的有机碳，是一个协调的 生物硅和有机碳循环的研究 罗斯海的水柱和沉积物。 南极深海 海洋和大陆架环境是 二氧化硅在全球海洋中的积累，并主导着全球 二氧化硅预算。 罗斯海是一个特别异常的区域， 大量的生物硅在现代 沉积物，而表面生产率一般低于 全球平均水平。 此外， 海洋硅和碳的循环似乎并不稳定 南极洲，这两个周期是脱钩的， 现代沉积物中的颗粒碳沉积非常低。 整个项目是对生产的综合研究， 垂直迁移、溶解和沉积过程， 停泊的仪器和直接观测， R/V POLAR杜克在罗斯海的断面， 1989年和1991年。 在该项目中，对箱型芯、活塞芯和卡斯滕芯进行了 沿着罗斯海的特定断面采集， 富硅和贫硅沉积物。 基于碳-14 生物硅和有机硅的年代学和海底分析 碳含量，三个地点的积累率不同， 已经确定了几个数量级。 在这些位点 两者的海底保存效率存在很大差异 生物硅和有机碳。 这一新的努力将是 关注对两次航行数据的进一步分析， 包括海底再生率、碳14沉积物 年表和水平运输率的生物 水柱中的物质，并将这些结果与 生产和垂直运输研究正在完成， 合作调查员。

This project is the renewal of a study of the rates of deposition, seabed regeneration, and sediment accumulation of biogenic silica and organic carbon in the Ross Sea, and is part of a coordinated study of the biogenic silica and organic carbon cycling in the water column and the sediments of the Ross Sea. The antarctic deep sea and continental shelf environment is the major repository for silica accumulation in the global ocean, and dominates the global silica budget. The Ross Sea is a particularly anomalous area in which large amounts of biogenic silica are accumulating in modern sediments, while the surface production rates are generally below the global average. Moreover the usual similarity between the oceanic silicon and carbon cycle does not appear to hold around Antarctica, and the two cycles are decoupled in that the rate of particulate carbon deposition in the modern sediment is very low. The overall project is an integrated study of the production, vertical transport, dissolution, and deposition processes, using moored instrumentation and direct observations in a series of transects in the Ross Sea by R/V POLAR DUKE, carried out between 1989 and 1991. In this project, box cores, piston cores, and kasten cores were collected along specific transects in the Ross Sea that included both silica-rich and silica-poor sediments. Based on carbon-14 chronologies and seabed analyses of biogenic silica and organic carbon content, three sites with accumulation rates differing by several orders of magnitude have been identified. At these sites large differences in seabed preservation efficiency exist for both biogenic silica and organic carbon. This renewed effort will be concerned with further analysis of data from the two cruises, including seabed regeneration rates, carbon-14 sediment chronologies, and horizontal transportation rates for biogenic material in the water column, and to integrate these results with production and vertical transport studies being completed by other cooperating investigators.