Ironing out the role of benthic processes on nutrient cycling in the Gulf of Alaska

消除阿拉斯加湾底栖过程对养分循环的作用

• 批准号: 2319152
• 负责人: Allyson Tessin
• 金额: $ 33.49万
• 依托单位: Kent State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-11-01 至 2026-10-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2319152&HistoricalAwards=false
• 关键词: Ironing; out; role; benthic; processes

The northeastern North Pacific Ocean is a high nutrient, low chlorophyll region, where the availability of iron limits primary productivity. Marine primary productivity is a key component of the carbon cycle through the ocean’s biological pump, which describes the processes through which inorganic carbon is fixed by photosynthesis and exported into the ocean’s interior or to the seafloor. Understanding the controls on primary productivity in regions like the North Pacific is important to understanding the marine carbon cycle and global climate. Ocean margin sediments may be an important source of iron in the North Pacific. This project will study iron cycling in sediments in the Gulf of Alaska in order to constrain the source of iron from sediments to the ocean water column in this region. The project leader will create educational activities designed to “bring ocean research to the Midwest US.” The project will support a postdoctoral researcher, a graduate student, and undergraduate students. The team will investigate sedimentary iron cycling within a continental margin transect using a paired porewater and sediment geochemical approach. The quantity and speciation of iron will be determined to constrain the processes controlling active remobilization of iron and the potential for the sedimentary source of iron to change in the future. Additionally, this work will investigate linkages between organic matter and iron cycling to understand how changes in organic matter delivery to the sediments drives remobilization of iron, as well as how the formation of iron-organic matter complexes within the seafloor can enhance either mobilization or long-term sequestration of organic matter and iron within sediments. Paired porewater and sediment geochemical results will be interpreted with remote sensing techniques to investigate spatial and temporal drivers of iron remobilization.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

北太平洋东北部是一个高营养素，低叶绿素区域，铁的可用性限制了主要生产力。海洋初级生产力是通过海洋生物泵的碳循环的关键组成部分，该泵描述了通过光合作用固定无机碳并导出到海洋内部或海底的过程。了解北太平洋等地区的主要生产力的控制对于了解海洋碳循环和全球气候很重要。海边缘沉积物可能是北太平洋铁的重要来源。该项目将研究阿拉斯加湾沉积物中的铁循环，以限制该地区的铁的来源到该地区的海水柱。该项目负责人将创建旨在“将海洋研究带到中西部美国的教育活动”。该项目将支持博士后研究人员，研究生和本科生。该团队将使用配对的孔隙水和沉积物地球化学方法在连续边缘样带中研究沉积铁循环。将确定铁的数量和规范，以限制控制铁的主动重新启动的过程，以及铁的沉积物来源未来变化的潜力。此外，这项工作将研究有机物与铁循环之间的联系，以了解有机物向沉积物的变化如何驱动铁的重新启动，以及如何在海底内的铁甲非常有机物复合物的形成可以增强动员或长期序列有机物质和铁在沉积物中的序列。配对的孔隙水和沉积物地球化学结果将通过遥感技术来解释，以研究铁恢复的空间和临时驱动因素。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的智力优点和更广泛影响的审查标准通过评估来进行评估的。