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浮游植物铁有效性的影响铁是海洋中藻类的重要营养物质。不同形态的铁及其对藻类的有效性受到许多因素的影响，包括海水的酸度(或pH)。这项研究项目的重点是了解海洋酸化(低pH值)对铁与海水中与铁结合的化学物质之间的联系的影响。调查人员将在太平洋的沿海和海洋水域工作。这些水域的特点是与铁有弱联系和强联系的物质。样本将从华盛顿州、北太平洋环流北缘和东北亚北极太平洋的海洋站Papa附近的沿海水域采集。将采集水样以测试浮游植物对光线、pH、铁的形态以及与铁结合的物质的组成的反应。该项目将支持研究生和本科生。研究人员将参加一系列教育和外展活动。这项研究探讨海洋对人为二氧化碳上升的反应，并与海洋生物地球化学广泛相关。研究人员将研究海洋酸化对东北太平洋东部铁可获得性的影响。研究地点的特点是海洋的高营养低叶绿素(HNLC)区域，那里的浮游植物可能对铁的有效性特别敏感。研究区域还具有配体组成和结合强度的梯度。这项研究将调查铁与不同配体(与铁结合的有机化合物)之间的结合如何受到pH的影响，以及这反过来如何影响海洋中的初级生产力和微生物群落结构。研究人员将使用分批培养，在pH值为8.1和7.6的条件下，在强光和弱光条件下，研究浮游植物对铁的需求。了解pH值如何影响铁及其与配体的关系，将为评估海洋酸化对初级生产和生物地球化学过程的影响提供重要信息。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

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.