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.

我们建议应用半径（RA），thor和氦（He）的同位素，以详细确定痕量元素的来源，通量和下沉（TES：CD：CD，CO，CU，FE，MO，MO，NI，NI，NI，NI，V，ZN）沿着23°S S SONAL SECTION沿着印度海洋（Sio）的23°S Zonal区域（Sio）（Sio Sio）沿着沿水区域，一台地球上的一个settingiod odiod odiod。 The application of isotopes of radius (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, allowing an assessment of their interactions with surface ocean production and the carbon and nitrogen cycles. Combining measurements of TEs with Ra and 234Th isotopes as tracers for horizo​​ntal 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, continued (mainly the Zambezi River), sediments (on continuoustal slots), and ocean地壳（印度洋山脊的热热）。该研究将基于计划于2020年7月至2020年8月从南非到澳大利亚的SIO中的FS Sonne Cruise SO-276中收集的样品。我们的投资将成为国际协调计划的地理领域的一部分，并将为第二届印度洋探险计划（IIOE-2）做出贡献。这项研究的结果将具有了解生态系统运行的化学环境的全球意义。