Reactive iron supply to shelf sediments and surface waters of the California Current System

向加州海流系统的陆架沉积物和地表水供应活性铁

• 批准号: 0929339
• 负责人: James McManus
• 金额: $ 58.1万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0929339&HistoricalAwards=false
• 关键词: Reactive; iron; supply; shelf; sediments

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Coastal upwelling systems are oceanic regions of great importance with regard to productivity, air-sea carbon dioxide exchange, and carbon sequestration, as well as economically and ecologically valuable fisheries. In the California Current System (CCS), an upwelling region off the coast of California, a well-established poleward increase of phytoplankton biomass and productivity has been identified. However, the cause of this latitudinal gradient in productivity is unknown. A scientist from Oregon State University hypothesizes that this phenomena exists because of the amount of river-derived iron being delivered to the coastal shelf. As such, the researcher will be conducting experiments to determine the factors governing the supply of bioavailable iron to surface waters in the CCS. In addition, whether there is a northward increase in the supply of bioavailable iron within the CCS and whether it is linked to river runoff will also be evaluated. These goals will be attained by quantifying the temporal variability of iron in the Oregon shelf surface water, bottom water, and surface sediments, as well as the spatial variability in the pool of sedimentary reactive iron along the west coast gradient in river flow. Through the development of a better understanding of the magnitude, mechanism, and latitudinal variability of iron inputs to the CCS, the scientific community will be better able to predict the impacts of iron supply on coastal productivity. The educational impacts of this research include support for a post-doctoral scholar and an undergraduate student, as well as internship position for a local high school student via the Apprenticeship in Science and Engineering Program.

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。沿海上升流系统是在生产力、海气二氧化碳交换和碳固存以及具有经济和生态价值的渔业方面具有重要意义的海洋区域。在加利福尼亚洋流系统（CCS），一个远离加利福尼亚海岸的上升流区域，已经确定了浮游植物生物量和生产力向极地的增加。然而，造成这种生产力纬度梯度的原因尚不清楚。俄勒冈州立大学的一名科学家假设，这种现象的存在是因为大量的河流铁被输送到沿海大陆架。因此，研究人员将进行实验，以确定控制CCS地表水中生物可利用铁供应的因素。此外，还将评估CCS内生物可利用铁的供应是否向北增加，以及它是否与河流径流有关。这些目标将通过量化俄勒冈陆架地表水、底水和地表沉积物中铁的时间变异性，以及沿西海岸河流梯度沉积活性铁池的空间变异性来实现。通过更好地了解向CCS输入的铁的大小、机制和纬度变化，科学界将能够更好地预测铁供应对沿海生产力的影响。本研究的教育影响包括支持一名博士后学者和一名本科生，以及通过科学与工程学徒计划为一名当地高中生提供实习职位。