Reactive Radionuclides in the Eastern North Atlantic, Joint Global Ocean Flux Study

该提案要求为一组自然产生的放射性核素的分布和颗粒通量的空间变化研究重新提供资金，该研究是作为全球海洋通量联合研究（联合海洋通量研究）的北大西洋水华实验的一部分启动的。正在测量的放射性核素作为海洋示踪剂，可以提供有关生物地球化学过程速率的基本信息，这些生物地球化学过程控制着活性化学物质的清除和海洋水柱中生物成因颗粒的命运。这项研究的目的是检验这样一种假设，即微粒物质对可溶性化学物质的吸收和释放以及海洋水柱中微粒聚集体的形成和破坏，其发生的速度随海面浮游生物生产速度的变化和离开海面的有机物通量的变化而在空间和时间上发生变化层。这些数据将在生物速率测量和在国际JGOFS计划中收集的其他数据的背景下进行解释，并将用于测试生物地球化学模型。这项研究预计将有助于更好地了解海洋中的粒子通量和动力学，这是海洋化学、生物学和地质学广泛关注的问题。

This proposal requests renewed funding for a study of spatial variations in the distributions and particulate fluxes of a suite of naturally occurring radioactive nuclides, which was initiated as part of the North Atlantic Bloom Experiment of the Joint Global Ocean Flux Study (JGOFS). The radionuclides that are being measured serve as ocean tracers that can yield fundamental information about the rates of biogeochemical processes that govern the scavenging of reactive chemical species and the fate of biogenic particles in the oceanic water column. The study is designed to test the hypothesis that the uptake and release of soluble chemical species by particulate matter and the formation and destruction of particle aggregates in the oceanic water column occur at rates that vary both spatially and temporally in response to variations in the rate of plankton production at the sea surface and the flux of organic matter leaving the surface layer. The data will be interpreted within the context of biological rate measurements and other data that are being collected within the international JGOFS program and will be used to test biogeochemical models. This study is expected to contribute to a better understanding of particle fluxes and dynamics in the ocean, issues that are of broad concern to marine chemistry, biology and geology.