Collaborative Research: The Effect of Ocean Acidification on Fe Availability to Phytoplankton in Coastal and Oceanic Waters of the Eastern North Pacific

合作研究：海洋酸化对北太平洋东部沿海和海洋水域浮游植物铁有效性的影响

• 批准号: 1830029
• 负责人: Mark Wells
• 金额: $ 49.98万
• 依托单位: University of Maine
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-01-01 至 2024-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1830029&HistoricalAwards=false
• 关键词: Collaborative; Research; Effect; Ocean; Acidification

Collaborative Research: The Effect of Ocean Acidification on Fe Availability to Phytoplankton in Coastal and Oceanic Waters of the Eastern North PacificIron is an important nutrient for algae in the ocean. Different forms of iron and their availability to algae are influenced by many factors including the acidity of seawater (or pH). This research project focuses on understanding the effects of ocean acidification (low pH) on the associations between iron and chemical substances that bind with iron in seawater. The investigators will work in coastal and oceanic waters of the Pacific Ocean. These waters are characterized by substances that have weak and strong associations with iron. Samples will be collected from coastal waters off Washington State, the northern edge of the North Pacific gyre, and Ocean Station PAPA in the northeast subarctic Pacific. Water samples will be collected to test phytoplankton responses to light, pH, forms of iron, and the composition of the substances that bind with iron. This project will support graduate and undergraduate students. The investigators will participate in a range of education and outreach activities.This study addresses oceanic responses to rising anthropogenic CO2 and is broadly relevant to ocean biogeochemistry. The investigators will study the role of ocean acidification on iron availability in the Eastern North Pacific Ocean. The study location is characterized as a high nutrient low chlorophyll (HNLC) region of the ocean, where phytoplankton may be particularly sensitive to iron availability. The study region is also characterized by gradients in ligand composition and binding strength. This study will investigate how the associations between iron and different ligands (organic compounds that bind with iron) are influenced by pH and how this, in turn, influences primary production and microbial community structure in the ocean. The investigators will use batch cultures, at pH 8.1 and 7.6, and under high and low light regimes, to examine the iron demand of phytoplankton. Understanding how pH influences iron and its relationship with ligands will provide important information for assessing the impacts of ocean acidification on primary production and biogeochemical processes.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.

合作研究：海洋酸化对沿海地区北部太平洋地区沿海水域和海洋水域的Fe供应的影响是海洋藻类的重要营养素。不同形式的铁及其对藻类的可用性受许多因素的影响，包括海水的酸度（或pH）。该研究项目着重于了解海洋酸化（低pH）对与海水中铁结合的铁与化学物质之间关联的影响。调查人员将在太平洋的沿海和海洋水域工作。这些水的特征是与铁具有较弱且较强的缔合的物质。样品将从华盛顿州附近的沿海水域，北太平洋盖尔的北部边缘和东北亚北极太平洋的海洋站爸爸收集。将收集水样品，以测试对光，pH，铁的形式以及与铁结合的物质的组成的浮游植物反应。该项目将支持毕业生和本科生。调查人员将参加一系列教育和外展活动。这项研究涉及海洋对人为二氧化碳的增长的反应，并且与海洋生物地球化学广泛有关。研究人员将研究海洋酸化对铁在北太平洋东部的铁的作用。研究位置的特征是海洋中较高的养分低叶绿素（HNLC）区域，那里的浮游植物可能对铁的可用性特别敏感。研究区域还以配体组成和结合强度的梯度为特征。这项研究将研究铁与不同配体（与铁结合的有机化合物）之间的关联如何受pH的影响，而这又如何影响海洋中的一级生产和微生物群落结构。研究人员将使用pH 8.1和7.6的批处理培养物，以及在高光和低光方面的培养物来检查浮游植物的铁需求。了解pH的影响如何影响铁及其与配体的关系将提供重要的信息，以评估海洋酸化对初级生产和生物地球化学过程的影响。该奖项反映了NSF的法定任务，并被认为值得通过基金会的知识分子优点和更广泛的影响标准通过评估来进行评估。