Trace metal marine geochemistry: speciation and coastal processes

海水中的微量元素作为营养物质、海洋过程的示踪剂和污染物发挥着重要作用。 它们的地球化学循环对碳循环、气候变化、海洋生态系统和环境污染等不同领域的研究都有影响。 尽管微量元素的重要性已得到公认，但由于其来源、汇、内部循环和海洋内化学形态的不确定性，我们利用这一信息的能力受到限制。 我的研究重点是确定选定的微量元素（铝，镓，钛，锆，铪，锰，铜，镉，锌，铅）在东北太平洋的分布，并在某些情况下，他们的化学形态，以评估这些元素的源，汇和内部循环。 其目的是评估调节其分布的物理、化学和生物过程。这包括一些金属结合配体的特性，强烈影响微量元素的形态在海洋中。在未来几年里，我将集中在表征沿海来源和运输过程，包括河流输入，陆架交换，上升流和中尺度涡旋运输。 许多感兴趣的元素已知有沿海来源，但这些来源的详细来源和规模尚不清楚。 河流向海水和陆架提供溶解态金属和悬浮态沉积物，部分金属通过成岩作用从陆架沉积物中被活化。 涡流可能会将这些金属从沿海地区带到亚北极环流，这是一个已知的初级生产受铁限制的地区。 我建议看看在东北太平洋的选定的微量金属分布这些来源的效果。 我还建议看看强金属结合有机配体的结构，丰度和分布在各种河口和沿海制度，以及在实验室浮游植物培养。

Trace elements in seawater play important roles as nutrients, as tracers of ocean processes, and as contaminants.  Their biogeochemical cycling has implications for research in diverse areas such as the carbon-cycle, climate-change, ocean ecosystems, and environmental contamination.  Despite the recognized importance of trace elements, our ability to use this information is limited by uncertainties concerning their sources, sinks, internal cycling and chemical speciation within the ocean.  My research focuses on determining the distributions of selected trace elements (Al, Ga, Ti, Zr, Hf, Mn, Cu, Cd, Zn, Pb) in the Northeast Pacific, and in some cases their chemical speciation, to assess the sources, sinks, and internal cycling of these elements.  The aim is to evaluate the physical, chemical and biological processes regulating their distributions. This includes characterization of some of the metal-binding ligands which strongly influence trace element speciation in the oceans. Over the next few years I will focus on characterizing coastal sources and transport processes, including fluvial input, shelf exchange, upwelling and transport in mesoscale eddies.  Many of the elements of interest are known to have coastal sources, but the detailed origins and magnitudes of these sources are not known.  Rivers supply dissolved metals and suspended sediments to seawater and the continental shelf in this region, some metals are mobilized from the shelf sediments via diagenetic processes.  Eddies may carry these metals from the coastal region out into the subarctic gyre, an area where primary production is known to be limited by iron.  I propose to look at the effect of these sources on the distribution of selected trace metals in the northeast Pacific.  I also propose to look at the structure, abundance and distribution of the strong metal-binding organic ligands in various estuarine and coastal regimes, as well as in laboratory phytoplankton cultures.