Iron Speciation and Cycling in the Eastern Tropical North Pacific

利用现有的在墨西哥海岸外的东热带北太平洋进行巡航的机会，建议进行一些现场分析测量和实验室调查，以进一步研究铁的生物有效性和海洋铁配体化学。这一区域的主要浮游植物群落原氯球菌和聚球藻将在亚缺氧区之上的分层真光带的背景下进行研究，该亚区呈现出在营养、痕量金属、氧气和光照条件下具有强烈化学梯度的不同亚环境。将以机械和过程研究的方式研究痕量金属样品、使用竞争性配体结合伏安技术的甲板孵化、刻意的铁修饰和天然配体光化学分解研究等活动。这些调查的预期结果是增进对海洋中溶解铁的生物地球化学、形态形成和循环的了解，铁是一种通常被认为限制浮游植物生长的微量元素。

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.