Biogeochemistry of trace elements in the southeast Atlantic Ocean; a German contribution to the International GEOTRACES Programme

东南大西洋微量元素的生物地球化学；

• 批准号: 282121790
• 负责人: Professor Dr. Eric Achterberg
• 金额: --
• 依托单位: Department of Physics and Earth Sciences
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/282121790?language=en
• 关键词: Biogeochemistry; trace; elements; southeast; Atlantic

Our approved research cruise M121 with FS Meteor in the South Eastern (SE) Atlantic Ocean will take place in November/December 2015. With this proposal, we apply for funding of personnel to participate in the cruise and for costs during the evaluation phase after the cruise. The focus of the project is on trace metal biogeochemistry and chemical oceanography but also includes physical and biological oceanographic components. The main goal of the cruise is to determine in detail the distributions of trace elements in the water column of the SE Atlantic in order to constrain trace elements supply and removal mechanisms, their biogeochemical cycling, and their interaction with the nitrogen cycle in the study region. The cruise will officially be part of the internationally coordinated programme GEOTRACES. We will investigate in detail the distribution of the trace metals, some of which act as limiting micronutrients for primary productivity and diazotrophy. We will explore the relationship between macro- and micronutrient concentrations and fluxes, and ocean productivity and the nitrogen cycle. The trace element distribution will also be related to the distribution and mixing of the water masses of the Benguela upwelling region and their properties with respect to oxygen levels and exchange with the anoxic shelves. Furthermore, the fluxes and supply pathways of trace elements via dust (Namibian Desert), sediments and major rivers, mainly the Congo and Orange Rivers, will be investigated. Finally, we will study the offshore distribution of the trace elements as a function of major ocean circulation and water mass mixing, which will be done in collaboration with J. Scholten and M. Frank (Kiel) who submitted a complementary proposal. This work is of global significance and will provide improved understanding of the role of diverse processes in controlling the chemical environment, with focus on trace metals, in which ecosystems operate worldwide.

经批准，我们将于2015年11月/12月在东南大西洋进行带有FS Meteor的M121号研究巡航。根据这一提议，我们申请为参加巡航考察的人员提供资金，并申请为巡航考察后评估阶段的费用提供资金。该项目的重点是痕量金属地球化学和化学海洋学，但也包括物理和生物海洋学部分。这次航行的主要目标是详细确定东南大西洋水柱中微量元素的分布情况，以确定微量元素的供应和去除机制、其生物地球化学循环及其与研究区域氮循环的相互作用。这次航行将正式成为国际协调的GEOTRACES方案的一部分。我们将详细调查微量金属的分布，其中一些作为限制初级生产力和固氮微量营养素。我们将探讨宏观和微量营养素浓度和通量之间的关系，以及海洋生产力和氮循环。微量元素的分布也将与本格拉上升流区域的水团的分布和混合及其氧含量和与缺氧陆架交换的性质有关。此外，还将调查微量元素通过灰尘（纳米比亚沙漠）、沉积物和主要河流（主要是刚果河和橙子河）的通量和供应途径。最后，我们将研究作为主要海洋环流和水团混合的函数的微量元素的近海分布，这将与J. Scholten和M.弗兰克（基尔）等人提交了补充建议。这项工作具有全球意义，将有助于更好地了解各种进程在控制化学品环境方面的作用，重点是痕量金属，因为生态系统在世界各地运作。