Biogeochemistry of Carbon and Silicon on the Antarctic Shelf: Particle Flux and Taxonomic Studies

南极大陆架碳和硅的生物地球化学：粒子通量和分类学研究

• 批准号: 9221578
• 负责人: Robert Dunbar
• 金额: $ 6.08万
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-07-01 至 1995-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9221578&HistoricalAwards=false
• 关键词: Biogeochemistry; Carbon; Silicon; Antarctic; Shelf

This project is the renewal of a study of the vertical flux and the rate of dissolution of biogenic silica in the water column of 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. The vertical flux and dissolution rates were measured by deploying time-series sediment traps at two depths on each of three moorings for a period of fourteen months. In conjunction with transmissometers and current meter arrays, these moorings will allow the measurement and characterization of both vertical and horizontal fluxes of particulate matter during a complete annual cycle of production and sedimentation. The objectives of this renewal are to recover one sediment trap that was redeployed for an additional two years, to complete the analysis of all water column and sediment trap samples that are currently in hand, and to produce a synthesis of all project data sets in cooperation with the other investigators cooperating in this project.

本项目是对垂直通量研究的更新， 生物硅在水体中的溶解速率 罗斯海，是生物硅协调研究的一部分， 和有机碳循环的水柱和沉积物的 罗斯海 南极深海和大陆架 环境是硅积累的主要储存库， 全球海洋，并主导全球二氧化硅预算。 罗斯海 是一个特别异常的区域， 二氧化硅在现代沉积物中积累，而表面 生产率普遍低于全球平均水平。 此外 海洋硅和碳循环之间通常的相似性 在南极洲周围似乎并不存在，这两个周期是 解耦的是，颗粒碳沉积的速度在 现代沉积物非常低。 整个项目是一个综合的 研究生产，垂直运输，溶解， 沉积工艺，使用系泊仪器和直接 R/V POLAR在罗斯海一系列断面的观测 杜克大学，1989年至1991年之间进行。 通过展开法测定了垂直通量和溶解速率 在三个系泊系统中的每个系泊系统上的两个深度处的时间序列沉积物收集器 为期14个月。 结合 透射计和海流计阵列，这些系泊设备将 允许测量和表征垂直和 全年颗粒物水平通量 生产和沉积的循环。 这一目标 更新是恢复一个沉积物陷阱，这是重新部署为一个 再用两年时间，完成所有水柱的分析 和沉积物收集器样本，目前正在进行，并 与下列机构合作编制所有项目数据集的综合报告： 参与这个项目的其他调查员