Carbonate Production and Dissolution Rates During the Past 30,000 Years by Th-230 Profiling in Deep-Sea Sediment Cores

通过深海沉积物岩心 Th-230 剖面分析得出过去 30,000 年碳酸盐的产生和溶解速率

• 批准号: 8922707
• 负责人: Roger Francois
• 金额: $ 12.99万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-04-15 至 1992-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8922707&HistoricalAwards=false
• 关键词: Carbonate; Production; Dissolution; Rates; During

The study is funded for the development of Th-230 profiling in deep-sea sediments as a paleoceanographic tool. The first bjective of the research is to complete a survey of Th-flux in the deep sea based on sediment-trap samples. Results will be used to determine the extent to which Th-flux varies with particle flux on an ocean-wide scale. The second objective is to measure detailed detailed profiles of excess Th-230 in deep-sea sediment cores. The profiles will be interpreted with a model that assumes a known rain rate of thorium-230 to the seafloor, to construct records of biogenic calcium carbonate production and dissolution rates. The focus will be on variations that accompained the last deglaciation, and the records will be used to test models which seek to explain the increase in atmospheric carbon dioxide that occurred at that time.

这项研究是为开发Th-230剖面提供资金的。 作为古海洋学的工具。的 本研究的第一个目的是完成一项调查， 基于沉积物捕集器样品的深海钍通量。结果 将用于确定Th通量变化的程度 在海洋尺度上的粒子通量。第二个目标 是测量详细的过剩Th-230的详细分布， 深海沉积物岩心配置文件将被解释为 一个假设已知钍-230降雨率的模型， 海底，以构建生物钙的记录 碳酸盐生成和溶解速率。将侧重 最后一次冰消期的变化， 这些记录将被用来测试试图解释 大气中二氧化碳的增加发生在 当时