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

来自罗德岛大学和明尼苏达大学的这组科学家将测试一个假设，即水平平流在北大西洋水柱中放射性同位素230和231Pa的运输中起着重要作用。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230Th和231Pa，以及测量来自拉布拉多海的高沉积速率岩心的过量231Pa/ 230Th同位素比率。将进行实验室研究，以确定这些同位素在海水和微粒表面之间的分布系数。这些研究对于解释这些同位素留下的沉积记录应该证明是重要的，因为这些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。

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.