Trace element cycling and fluxes in the South Indian Ocean – a contribution to GEOTRACES

南印度洋的微量元素循环和通量——对 GEOTRACES 的贡献

• 批准号: 445391652
• 负责人: Professor Dr. Eric Achterberg
• 金额: --
• 依托单位: GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/445391652?language=en
• 关键词: Trace; element; cycling; fluxes; South

We propose to apply isotopes of radium (Ra), thorium and helium (He) to determine in detail the sources, fluxes and sinks of trace elements (TEs: Cd, Co, Cu, Fe, Mn, Mo, Ni, V, Zn) in the water column along a 23°S zonal section in the South Indian Ocean (SIO), one of the least studied ocean regions on earth. The application of isotopes of radium (224Ra, 223Ra, 228Ra 226Ra,), thorium (234Th 232Th,), helium (3He, 4He) will facilitate the study of the biogeochemical cycles of TEs, and given that some TEs act as micronutrients, allow an assessment of their interactions with surface ocean productivity and the carbon and nitrogen cycles. Combining measurements of TEs with Ra and 234Th isotopes as tracers for horizontal and vertical fluxes, 232Th as a tracer for dust inputs, and He isotopes as a tracer for hydrothermal inputs, we will investigate and quantify the supply pathways of TEs to the SIO from the atmosphere, continent (mainly the Zambezi River), sediments (on continental slopes), and ocean crust (hydrothermalism of Indian Ocean Ridge). The study will be based on samples collected during FS Sonne cruise SO-276 scheduled for July – August 2020 in the SIO from South Africa to Australia. Our investigations will be part of the internationally coordinated program GEOTRACES and will contribute to the Second Indian Ocean Expedition Program (IIOE-2). The outcome of this study will have global significance for understanding the chemical environment in which ecosystems operate.

我们建议应用镭（Ra）、钍和氦（He）同位素来详细确定微量元素（TE：Cd、Co、Cu、Fe、Mn、Mo、Ni、V、Zn）的源、通量和汇。 ）位于南印度洋 (SIO) 沿 23°S 纬向剖面的水柱中，这是地球上研究最少的海洋区域之一。 镭同位素的应用。 (224Ra, 223Ra, 228Ra 226Ra,)、钍 (234Th 232Th,)、氦 (3He, 4He) 将促进 TE 的生物地球化学循环的研究，并且考虑到一些 TE 作为微量营养素，可以评估它们与将 TE 测量值与 Ra 和 234Th 相结合。同位素作为水平和垂直通量的示踪剂，232Th作为尘埃输入的示踪剂，He同位素作为热液输入的示踪剂，我们将研究和量化TE从大气、大陆（主要是赞比西河）到SIO的供应路径）、沉积物（大陆坡上）和洋壳（印度洋海脊的热液作用） 该研究将基于 FS Sonne 巡航期间收集的样本。 SO-276 计划于 2020 年 7 月至 8 月在 SIO 从南非到澳大利亚进行，我们的调查将是国际协调计划 GEOTRACES 的一部分，并将为第二次印度洋探险计划 (IIOE-2) 的研究成果做出贡献。对于了解生态系统运行的化学环境具有全球意义。