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

这项研究是amasds项目（多学科亚马孙大陆架沉积物研究）的一部分，该项目旨在了解影响或受亚马孙大陆架颗粒通量影响的物理、化学和地质过程。由于亚马逊河的大量沉积物排放和潮汐过程对细粒陆架沉积物的广泛再悬浮，亚马逊陆架上出现了高颗粒通量。本部分审查发生在亚马孙河/海洋边界的几种受粒子通量影响的化学过程。具体的研究主题描述：(1)在河流/海洋混合过程中，铀和镭从颗粒相释放到溶解相；(2)从大陆架水域清除颗粒活性元素；(3)评价悬浮物浓度对碳、硅的生物吸收和再生的影响。这项研究是amasds项目（多学科亚马孙大陆架沉积物研究）的一部分，该项目旨在了解影响或受亚马孙大陆架颗粒通量影响的物理、化学和地质过程。由于亚马逊河的大量泥沙排放以及潮汐将细粒泥沙与河水混合，亚马逊陆架上出现了高通量。整个项目的这一部分考察了亚马孙河/海洋边界发生的几种受颗粒通量影响的化学过程。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.