Spatial and Temporal Variability of Silver Concentrations and Lead Concentrations and Isotopic Compositions in the North Pacific Rim and Ocean

北太平洋沿岸和海洋中银浓度和铅浓度以及同位素组成的时空变化

• 批准号: 0751681
• 负责人: Arthur Flegal
• 金额: --
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-03-01 至 2013-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0751681&HistoricalAwards=false
• 关键词: Spatial; Temporal; Variability; Silver; Concentrations

Extremely sensitive and precise measurements of lead and silver in the ocean have revealed marked anthropogenic perturbations of their global biogeochemical cycles. Lead was the most contaminated ? relative to its natural concentration - trace element in the oceans in the previous century, and silver now appears to be assuming that dubious title. In this study, researchers at the University of California at Santa Cruz, in collaboration with colleagues at several other U.S. and international institutions, will study the distribution of these two metals in the North Pacific basin. Proposed analyses of spatial and temporal variability of the two metals in the North Pacific, where there is a surprising dearth of data for either, will provide both basic information on their natural biogeochemical cycles and quantification of industrial perturbations of those cycles. In addition, contrasting aspects of those cycles, along with the demonstrated applicability of stable lead isotopic ratios to characterize and distinguish diverse natural and industrial sources of lead in the biosphere, make the two metals complementary geotracers of other historic and emerging anthropogenic pollutants.This work will have a number of significant broader impacts. The project, headed by a female postdoctoral researcher, will include several undergraduates, with at least one intern from the California Alliance for Minority Participation in Science, Engineering and Mathematics Program (CAMP), which is directed at UCSC by the CoPI. This NSF funded program, which has measurably increased the number of under-represented students graduating from UC and continuing on to graduate studies over the past decade, has recently been funded for 5 more years. The project will also include many collaborations, both U.S. and international..

对海洋中铅和银的极其灵敏和精确的测量揭示了其全球生物地球化学循环的明显人为扰动。铅污染最严重？相对于其自然浓度——上个世纪海洋中的微量元素，白银现在似乎承担了这个可疑的称号。在这项研究中，加州大学圣克鲁斯分校的研究人员将与其他几个美国和国际机构的同事合作，研究这两种金属在北太平洋盆地的分布。 北太平洋地区两种金属的数据严重缺乏，拟议对这两种金属的空间和时间变化进行分析，将提供有关其自然生物地球化学循环的基本信息以及这些循环的工业扰动的量化。此外，这些循环的对比方面，以及稳定铅同位素比率在表征和区分生物圈中不同的自然和工业铅来源方面所表现出的适用性，使得这两种金属成为其他历史和新兴人为污染物的互补地理示踪剂。这项工作将产生许多重大的更广泛的影响。 该项目由一名女性博士后研究员领导，将包括几名本科生，其中至少一名实习生来自加州少数族裔参与科学、工程和数学项目联盟 (CAMP)，该项目由 CoPI 指导 UCSC。这项由 NSF 资助的项目在过去十年中显着增加了从 UC 毕业并继续攻读研究生的弱势学生数量，最近又获得了 5 年的资助。 该项目还将包括许多美国和国际合作。