Evaluating the Effects of High Particulate Fluxes on Chemi- cal Processes Occurring at the Amazon River/Ocean Boundary

这项研究是AmasSeds项目(亚马逊大陆架沉积物多学科研究)的一部分，该项目试图了解影响亚马逊大陆架颗粒通量或受其影响的物理、化学和地质过程。由于亚马逊河的巨大泥沙排放和潮汐过程对细粒陆架沉积物的广泛再悬浮，亚马孙大陆架上出现了高颗粒物通量。这一部分考察了亚马逊河/海洋边界上发生的几个化学过程，这些过程受到颗粒通量的影响。具体的研究主题包括：(1)河流/海洋混合过程中，铀和镭从颗粒相释放到溶解相：(2)从大陆架水域中清除颗粒活性元素；(3)评价悬浮泥沙浓度对生物吸收和再生碳、硅的影响。这项研究是AmasSeds项目(亚马逊大陆架沉积物多学科研究)的一部分，该项目试图了解影响亚马逊大陆架颗粒通量或受其影响的物理、化学和地质过程。由于亚马逊河排出的大量泥沙以及潮汐将细粒沉积物与河水混合在一起，亚马逊大陆架上出现了高通量。整个项目的这一部分审查了亚马逊河/海洋边界上发生的几个化学过程，这些过程受到颗粒通量的影响。对这些过程的理解将有助于研究人员解释来自世界各地其他河流/海洋系统的观测结果。

This research is part of the AmasSeds Project (A Multi- disciplinary Amazon Shelf Sediment Study), which seeks to understand the physical, chemical and geological processes that affect, or are affected by, particle fluxes on the Amazon shelf. High particulate fluxes occur on the Amazon shelf as a result of the enormous sediment discharge from the Amazon River and the extensive resuspension of fine-grained shelf sediment by tidal processes. This component examines several chemical processes occurring at the Amazon River/ocean boundary which are affected by particle fluxes. The specific topics of research describe: (1) the release of uranium and radium from the particulate phase to the dissolved phase during river/ocean mixing: (2) scavenging of particle-reactive elements from continental shelf waters; and (3) evaluating the effects of suspended sediment concentration on the biological uptake and regeneration of carbon and silicon. This research is part of the AmasSeds Project (A Multi- disciplinary Amazon Shelf Sediment Study), which seeks to understand the physical, chemical and geological proceses that affect, or are affected by, particle fluxes on the Amazon shelf. High fluxes occur on the Amazon shelf as a result of the enormous sediment discharge from the Amazon River and the mixing of fine- grained sediment with river water by the tides. This component of the overall project examines several chemical processes occurring at the Amazon River/ocean boundary which are affected by particle fluxes. An understanding of these processes will help investigators to interpret observations from other river/ocean systems throughout the world.