Physiocochemical Processes Controlling Thorium Behavior in the Ocean

必须充分了解控制海洋中具有粒子反应性的U/Th衰变系列同位素去向的过程，以确定它们作为粒子动力学示踪剂的作用。钍的动力学和平衡行为似乎是物理(颗粒-颗粒相互作用)和化学(吸附)过程相结合的结果。将测试胶体泵浦假说，即Th同位素通过胶体从溶解状态转移到大颗粒中。研究表明，Th“清除”率很可能代表了具有大颗粒池的亚微米颗粒的凝聚速率，而不是Th吸附本身。实验室实验将使用无机和有机模型颗粒，以进一步测试和模拟所提出的吸附和混凝过程的耦合。现场实验将在实验受限的条件下测试海洋清除模型，以更好地了解实验室研究结果对自然环境的适用性。

The processes controlling the fate of particle-reactive U/Th decay series isotopes in the oceans must be fully understood in order to ascertain their usefulness as tracers for particle dynamics. Thorium kinetic and equilibrium behavior appears to be the consequence of a combination of physical (particle- particle interactions) and chemical (adsorption) processes. A colloidal pumping hypothesis stating that Th isotopes are transferred from the dissolved state to macroparticles via a colloidal will be tested. Research suggests that Th "scavenging" rates most likely represent the rate of coagulation of submicron particles with a large-particle pool rather than Th sorption itself. Laboratory experiments will use inorganic and organic model particles in order to further test and simulate the proposed coupling of sorption and coagulation processes. Field experiments will test the oceanic scavenging model under experimentally constrained conditions to better understand the applicability of results from laboratory studies to natural environments.