230Th and 231Pa: Tracers of Particle Flux and Ventilation in the Atlantic

230Th 和 231Pa：大西洋粒子通量和通风的示踪剂

• 批准号: 9730257
• 负责人: Stephen Moran
• 金额: $ 29.98万
• 依托单位: University of Rhode Island
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-04-15 至 2003-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9730257&HistoricalAwards=false
• 关键词: 230Th; 231Pa; Tracers; Particle; Flux

9730257 Moran This team of scientists from the Univbersity of Rhode Island and the University of Minnesota will test the hypothesis that horizontal advection plays a significant role in the transport of the radioisotopes 230Th and 231Pa in the water column of the North Atlantic. Studies will involve measurement of 230Th and 231Pa in North Atlantic Deep Water, the Labrador Sea, and other water masses of the North Atlantic as well as downcore measurements of the excess 231Pa/ 230Th isotopic ratio in high sedimentation rate cores from the Labrador Sea. Laboratory studies would be conducted to determine distribution coefficients of these isotopes between seawater and particulate surfaces. Such studies should prove important in interpreting the sedimentary record left by these isotopes inasmuch as that record provides insight into the paleoceanogrphy of the North Atlantic, especially the formation of North Atlantic Deep Water.

9730257莫兰这个来自罗德岛大学和明尼苏达大学的科学家团队将测试水平平流在北大西洋水柱中放射性同位素230和231pa的传输中发挥重要作用的假设。研究将包括测量北大西洋深水、拉布拉多海和北大西洋其他水团的230和231Pa值，以及向下测量拉布拉多海高沉积速率岩心中过剩的231Pa230th值的同位素比值。将进行实验室研究，以确定这些同位素在海水和颗粒表面之间的分配系数。这类研究在解释这些同位素留下的沉积记录方面应被证明是重要的，因为该记录提供了对北大西洋古海洋学的洞察，特别是北大西洋深水的形成。