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利用在墨西哥海岸附近的东部热带北太平洋进行的现有巡航机会，建议进行一些现场分析测量和实验室研究，以进一步研究铁的生物利用度和海洋铁配体化学。该地区的主要浮游植物群落，原绿球藻和聚球藻，将在低氧区上方的分层透光区的背景下进行研究，该低氧区呈现出独特的亚环境，在营养物、微量金属、氧气和光照方面具有很强的化学梯度。将以机械和过程研究的方式研究痕量金属取样、使用竞争性配体结合伏安技术的甲板上孵育、有意的铁修正和天然配体光化学分解研究等活动。这些研究的预期结果是加深对溶解铁的生物地球化学、形态和循环的了解，溶解铁是一种通常被认为限制海洋中浮游植物生长的微量元素。