Iron Speciation and Cycling in the Eastern Tropical North Pacific

利用现有的巡航机会发生在东热带北太平洋，墨西哥海岸，一些现场分析测量和实验室调查，建议进一步研究铁的生物利用度和海洋铁配体化学。在这一地区的优势浮游植物群落，原绿球藻和聚球藻，是在一个分层的真光区覆盖的亚氧区的背景下进行研究，提出不同的子环境具有很强的化学梯度的营养，微量金属，氧气和光制度。将以机制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法技术的甲板上孵育、有意的铁修正和天然配体光化学分解研究等活动。这些调查的预期成果是增加对海洋中溶解铁的地球化学、形态形成和循环的了解，铁是一种经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.