U.S.-New Zealand Collaborative Research: The Biogeochemical Cycling of Iron in Waters of the Subantarctic Southern Ocean [FeCycle]

美国-新西兰合作研究：亚南极南大洋水域中铁的生物地球化学循环 [FeCycle]

• 批准号: 0236987
• 负责人: David Hutchins
• 金额: $ 1.44万
• 依托单位: University of Delaware
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-04-01 至 2004-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0236987&HistoricalAwards=false
• 关键词: U.S.; New; Zealand; Collaborative; Research

0238615McKayA multidisciplinary and multinational research group working on board a New Zealand ship and led by Dr. Philip Boyd of University of Otago, New Zealand, will seek to gain a better understanding of the role of iron in the structure and function of the ecosystems of the Southern Ocean. This award supports Dr. Robert McKay of Bowling Green State University to participate in this field research as the lead Principal Investigator for a group of three U.S. scientists and a graduate student involved in the same research cruise and supported by separate grants. His U.S. co-Principal Investigators and their award numbers are Steven Wilhelm of the University of Tennessee at Knoxville (0240092) and David Hutchins of the University of Delaware (0236987). The specific research foci of the three U.S. scientists differ. Dr. McKay will measure diagnostic indicators of iron limitation such as the ratio of flavodoxin to ferrodoxin. Dr. Wilhelm and Dr. McKay will evaluate degrees of iron stress in the phytoplankton community using state-of-the-art prokaryotic bioreporter constructs. Dr. Hutchins will simulate changes in diapycnal iron inputs using a novel shipboard natural community chemostat system. He will also apply a newly developed trace metal clean surface wash method to measure scavenged and interior pools of particulate iron.The micronutrient iron limits phytoplankton growth and photosynthesis over most of the large Southern Ocean surrounding Antarctica. This in turn affects the global carbon cycle.Most studies of iron in the ocean have come from adding artificially high levels and monitoring the changes seen in the affected body of water. Very little is known about the major pools, fluxes and biogeochemical pathways of this limiting nutrient under unperturbed natural conditions. This research effort will employ several novel techniques to assess microbial impacts on and reactions to iron levels in a natural oceanic environment. This will be a significant contribution to the ability to model the natural marine iron cycle in an important region of the world's ocean. If successful, the innovative techniques employed will have wide value to other marine scientists. It will have educational impacts for the US graduate student who will participate and for students of the US investigators who will learn about the work.

0238615McKay一个多学科和多国研究小组在新西兰船上工作，由新西兰奥塔哥大学的Philip Boyd博士领导，将寻求更好地了解铁在南大洋生态系统结构和功能中的作用。该奖项支持保龄球绿色州立大学的罗伯特·麦凯博士作为三名美国科学家和一名研究生的首席研究员参与这一领域的研究，他们参与了同一次研究巡航，并得到了单独赠款。 他的美国共同主要研究者和他们的获奖号码是田纳西大学诺克斯维尔分校的史蒂文·威廉（0240092）和特拉华州大学的大卫·哈钦斯（0236987）。这三位美国科学家的具体研究重点不同。 McKay博士将测量铁限制的诊断指标，如黄素氧还蛋白与铁氧还蛋白的比率。Wilhelm博士和McKay博士将使用最先进的原核生物报告构建体评估浮游植物群落中的铁胁迫程度。 Hutchins博士将使用一种新的船上自然群落恒化器系统模拟diapycnal铁输入的变化。 他还将应用一种新开发的痕量金属清洁表面清洗方法来测量清除和内部池的颗粒铁。微量营养素铁限制了南极洲周围大部分南大洋的浮游植物生长和光合作用。这反过来又影响了全球的碳循环。大多数关于海洋中铁的研究都是通过人为地增加铁的含量并监测受影响水体的变化来进行的。在未受干扰的自然条件下，对这种限制性营养素的主要库、通量和生物地球化学途径知之甚少。 这项研究工作将采用几种新技术来评估微生物对自然海洋环境中铁水平的影响和反应。这将大大有助于提高在世界海洋的一个重要区域建立自然海洋铁循环模型的能力。如果成功，所采用的创新技术将对其他海洋科学家具有广泛的价值。 它将对参与的美国研究生和将了解这项工作的美国调查人员的学生产生教育影响。