Iron Speciation and Cycling in the Eastern Tropical North Pacific

热带北太平洋东部的铁形态和循环

• 批准号: 0220959
• 负责人: Katherine Barbeau
• 金额: $ 12.5万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-15 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0220959&HistoricalAwards=false
• 关键词: Iron; Speciation; Cycling; Eastern; Tropical

ABSTRACTOCE-0220959Taking advantage of existing cruise opportunities to take place in the Eastern Tropical North Pacific, off the coast of Mexico, a number of field analytical measurements and laboratory investigations are proposed to further research into iron bioavailability and marine iron ligand chemistry. Dominant phytoplankton communities in this region, Prochlorococcus and Synechococcus, are to be studied in the context of a layered euphotic zone overlying a suboxic zone presenting distinct sub-environments having strong chemical gradients in nutrient, trace metal, oxygen and light regimes. Activities such as trace metal sampling, on-deck incubations using competitive ligand binding voltammetric techniques, deliberate iron amendment and natural ligand photochemical decomposition studies will be studied in a mechanistic and process study manner. The anticipated outcome of these investigations is increased understanding of the biogeochemistry, speciation and cycling of dissolved iron, a trace element often thought to be limiting to phytoplankton growth, in the ocean.

Abstractoce-0220959摄入的优势在墨西哥沿海的东部热带北太平洋发生的现有巡航机会，提出了许多现场分析测量和实验室研究，以进一步研究铁生物利用度和海洋铁配体配体化学。在该地区的主要浮游植物群落，占地氯环球菌和综合菌，应在覆盖亚氧化区的分层爵士区域的背景下进行研究，呈现出不同的亚氧化区，表现出不同的亚浓度，具有较强的营养，痕量金属，氧气和光条件的化学梯度。诸如痕量金属采样，使用竞争性配体结合伏安法技术，故意铁修正和天然配体光化学分解研究的活动将以机械和过程研究的方式研究。这些研究的预期结果是，人们对溶解铁的生物地球化学，物种形成和循环的了解增加了，这是痕量元素通常被认为限制了海洋中浮游植物的生长。