Effects of ocean acidification on the interrelations of the trace metals cadmium, iron, and zinc; its implications for marine phytoplankton physiologiy and biological feedback mechanisms to climate change

微量金属的生物有效性影响生长，光合效率，大量营养素的消耗，以及海洋浮游植物群落的物种组成。由于痕量金属形态对海水pH值敏感，因此持续的海洋酸化可能会影响痕量金属的生物利用度，因此将对未来海洋中的痕量金属化学和浮游植物生产力产生重大影响。这里提出的项目结合了化学和生物学的方法来调查这些相互关系。化学部分主要研究了南大洋沃茨pH值降低对生物活性痕量金属镉（Cd）、铁（Fe）和锌（Zn）的形态和相互关系的影响。生物部分的目的是调查其对初级生产力，物种组成，浮游植物元素组成与碳循环和出口的影响。这两个部分再次通过调查微量金属形态的生物反馈机制相互关联。该项目将与东道机构的一个项目密切相关，该项目旨在校准海水中PO4浓度的镉古替代物。Cd：PO4的关系是复杂的，被认为是受Cd利用生物群以及Fe和Zn的化学性质和海水pH值的影响。

Trace metal bioavailability influences growth, photosynthetic efficiency, macronutrient consumption, as well as species composition of the marine phytoplankton community. Since trace metal speciation is sensitive to seawater pH it is likely that ongoing ocean acidification will affect the bioavailability of trace metals and will therefore have major implications for the trace metal chemistry and phytoplankton productivity in the future ocean. The project proposed here combines a chemical and a biological approach to investigate these interrelationships. The chemical part concentrates on the effect of decreasing seawater pH on the speciation and interrelationship of the biologically-active trace metals cadmium (Cd), iron (Fe), and zinc (Zn) in Southern Ocean waters. The biological part aims to investigate the effect thereof on primary production, species composition, and phytoplankton elemental composition with implications for carbon cycling and export. Both parts are again interconnected by investigating biological feedback mechanisms on trace metal speciation. This project will be closely linked into a project at the host institution that aims to calibrate the cadmium paleo-proxy for PO4 concentrations in seawater. The Cd:PO4 relationship is complex and thought to be affected by Cd utilizing biota as well as by the chemistries of Fe and Zn, and seawater pH.