Pelagic processes and nitrogen cycle in coastal waters off southern central Vietnam: mesocosm experiments, field work and modelling

越南中南部沿海水域的中上层过程和氮循环：中生态实验、实地工作和建模

• 批准号: 5402006
• 负责人: Professor Dr. Bodo von Bodungen
• 金额: --
• 依托单位: Leibniz-Institut für Ostseeforschung Warnemünde (IOW)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2003
• 资助国家: 德国
• 起止时间: 2002-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5402006?language=en
• 关键词: Pelagic; processes; nitrogen; cycle; coastal

Pelagic system dynamics will be studied off southern central Vietnam in the South China Sea with a focus on the nitrogen cycle and vertical fluxes along hydrographical and biogeochemical gradients from coastal to oceanic conditions. Pelagic system responses on different new nutrient sources for primary production (upwelling, river discharge, atmospheric input by N-fixation) will be assessed during the monsoon and intermonsoon seasons. Stable N-isotope analyses will be performed on water column inventories (nutrients, suspended particles, mesozooplankton), particle fluxes and surface sediments in relation to N-fixation, new production and denitrification. Field work comprises samplings on grid stations and short time-series process studies including vertical flux measurements with shallow moored and/or drifting traps. The project contributes to biogeochemical province descriptions, and links the coastal realm with the shelf/ocean margin pelagical and oceanic conditions over the adjacent deep sea basin. This is done jointly with German partners regarding hydrography, exports from estuaries, sediment geochemistry and annual deep particle fluxes. Collaboration with Vietnamese institutes on plankton variability, nutrient availability and production patterns, and on satellite remote sensing also aims at capacity building in biological oceanography.

将研究越南中南部附近的南中国海域的远洋系统动力学，重点是从沿海到海洋条件下的氮循环和沿水文和生物地球化学梯度的垂直通量。在季风季和季风季期间，将评估远洋系统对初级生产的不同新营养来源(上升流、河流排放、固氮大气输入)的反应。将对与固氮、新生产和反硝化有关的水柱清单(营养物、悬浮颗粒、中游动物)、颗粒通量和表层沉积物进行稳定的氮同位素分析。实地工作包括对网格站的抽样和短时间序列过程研究，包括用浅系泊和/或漂流陷阱测量垂直通量。该项目有助于生物地球化学省的描述，并将沿海地区与邻近深海盆地上方的陆架/海洋边缘的上层和海洋条件联系起来。这项工作是与德国合作伙伴共同完成的，涉及水文地理学、河口出口、沉积物地球化学和年度深层颗粒物通量。与越南研究所在浮游生物可变性、营养物质的可获得性和生产模式以及卫星遥感方面的合作也旨在生物海洋学方面的能力建设。