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

这项研究是为深海沉积物中Th-230剖面作为古海洋学工具的发展而资助的。研究的第一个目标是完成基于沉积物捕集器样本的深海th通量调查。结果将用于确定整个海洋范围内th通量随粒子通量变化的程度。第二个目标是测量深海沉积物岩心中过量钍-230的详细剖面。这些剖面将用一个模型来解释，该模型假设已知的钍-230向海底的降雨速率，以构建生物成因碳酸钙生产和溶解速率的记录。研究的重点将放在伴随最后一次冰川消融的变化上，这些记录将被用来检验那些试图解释当时发生的大气二氧化碳增加的模型。

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.