GEOTRACES: Determination of copper distribution, speciation, and its relationship to picoplankton community structure for the U.S. GEOTRACES Zonal North Atlantic Survey Section

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。GEOTRACES是一项新启动的国际海洋学计划，旨在确定控制海洋中关键微量元素和同位素分布的过程和量化通量，并建立对这些分布对不断变化的环境条件的敏感性的理解。南加州大学的一位科学家计划参加2010年北大西洋GEOTRACES巡航，收集和分析总溶解铜（Cu）和铜形态的样本。目的是利用大量其他参数，特别是颗粒金属和颗粒反应性同位素，确定在广泛的海洋环境（即陆架和斜坡水域、少营养表面和温跃层、东部边界上升流）中铜循环及其物种形成之间的关系。结合其他人获得的颗粒金属和颗粒反应同位素数据，还将评估物种形成在影响下沉颗粒物质中Cu:C和Cu:N以及深水中溶解的N:Cu和P:Cu比率方面的作用。此外，通过与两名分子生物学家的合作，该项目将免费对整个剖面的蓝藻生态型种群进行表征，并建立金属地球化学与蓝藻群落结构控制之间的关系。至于更广泛的影响，一名博士后和一名研究生将作为该项目的一部分得到支持和培训。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).GEOTRACES is a newly initiated international oceanographic program to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes in the oceans and to establish an understanding of the sensitivity of these distributions to changing environmental conditions. A scientist from the University of Southern California plans to participate in the 2010 North Atlantic GEOTRACES cruise to collect and analyze samples for total dissolved copper (Cu) and copper speciation. The objective is to determine the relationship between Cu cycling and its speciation over wide range of oceanographic regimes (i.e., shelf and slope waters, oligotrophic surface and thermocline, eastern boundary upwelling) with a vast array of other parameters, particularly particulate metals and particle-reactive isotopes. Coupled with particulate metal and particle-reactive isotope data obtained by others, the role of speciation in influencing Cu:C and Cu:N in sinking particulate matter, and dissolved N:Cu and P:Cu ratios in deep water, will also be assessed. In addition, via a collaboration with two molecular biologists at no cost to the project, the ecotype population of cyanobacteria throughout the section will be characterized and the relationships between metal geochemistry and the control of cyanobacterial community structure will be established. As regards broader impacts, one postdoc and one graduate student would be supported and trained as part of this project.