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.

我们批准的 FS Meteor 在东南大西洋 (SE) 的 M121 研究巡航将于 2015 年 11 月/12 月进行。根据此提案，我们申请资助参与该巡航的人员以及研究巡航结束后评估阶段的费用。巡航。该项目的重点是痕量金属生物地球化学和化学海洋学，但也包括物理和生物海洋学成分。巡航的主要目标是详细确定东南大西洋水体中微量元素的分布，以限制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。该邮轮将正式成为国际协调计划 GEOTRACES 的一部分。我们将详细研究痕量金属的分布，其中一些金属充当初级生产力和固氮营养的限制性微量营养素。我们将探讨大量和微量营养素浓度和通量与海洋生产力和氮循环之间的关系。微量元素分布还与本格拉上升流区域水团的分布和混合及其在氧气水平和与缺氧陆架交换方面的特性有关。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（主要是刚果河和奥兰治河）的通量和供应途径。最后，我们将研究微量元素的近海分布作为主要海洋环流和水团混合的函数，这将与提交补充提案的 J. Scholten 和 M. Frank（基尔）合作完成。这项工作具有全球意义，将加深人们对不同过程在控制化学环境中的作用的理解，重点关注全球生态系统运作的微量金属。