GEOTRACES Arctic section: Dissolved micronutrient trace metal distributions and size partitioning

GEOTRACES 北极部分：溶解的微量营养素微量金属分布和尺寸分配

基本信息

批准号：
1713677
负责人：
Jessica Fitzsimmons
金额：
$ 44.56万
依托单位：
Texas A&M University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-10-03 至 2019-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1713677&HistoricalAwards=false
关键词：
GEOTRACES Arctic section Dissolved micronutrient

项目摘要

In this project, investigators participating in the 2015 U.S. GEOTRACES Arctic expedition will measure the concentrations of iron, manganese, zinc, copper, cadmium, and nickel from a variety of seawater and ice samples in the Western Arctic Ocean. These are commonly referred to as 'micronutrients' because they are present in the ocean in extremely low concentrations and because they are essential for marine organisms. In common with other national initiatives in the International GEOTRACES Program, the goals of the U.S. Arctic expedition are to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions. Some trace elements are essential to life, others are known biological toxins, and still others are important because they can be used as tracers of a variety of physical, chemical, and biological processes in the sea. The six trace elements to be measured in this study are arguably the most important bioactive trace elements in the oceans, and their measurement will provide key information on biological and physical processes in the Arctic. This project will be carried out under the direction of a postdoctoral researcher, providing a unique professional development opportunity for an early career scientist. In addition, the research will involve the training of an undergraduate researcher, and provide public outreach opportunities to K-12 teachers and students, and indigenous populations in Alaska.The six micronutrients to be measured under this project have all been identified as key trace elements for the GEOTRACES Program. This research will allow rigorous testing of the Arctic physical and biological processes, many of which are already undergoing fundamental changes as a result of climate change, that control the inputs and fate of key micronutrient metals in the Arctic Ocean. Colloidal distributions are specifically targeted in order to derive additional information on the unique physicochemical form and reactivity of distinct dissolved metal pools. The project will also explore the role of melting sea ice in driving near-surface concentrations of these elements by measuring concentrations and size partitioning of these six metals in sea ice, snow, melt ponds, and in the seawater immediately under sea ice. Given that the Arctic is a relatively small basin surrounded by broad continental shelves, sedimentary sources and sinks will also play a major role in controlling the distributions of these elements. Thus, metal concentrations in porewater samples from bottom sediments will also be determined from cores in the Bering and Chukchi Seas, in order to investigate benthic exchanges.

在该项目中，参加2015年美国北极探险队的调查人员将测量来自北极海洋中各种海水和冰样品的铁，锰，锌，铜，镉和镍的浓度。这些通常被称为“微量营养素”，因为它们以极低的浓度存在于海洋中，并且因为它们对于海洋生物至关重要。美国北极探险队的目标是与国际地理计划计划中的其他国家倡议共同确定过程，并量化控制海洋中关键的微量元素和同位素分布的通量，并确定这些分布对改变环境条件的敏感性。一些痕量元素对生命至关重要，另一些是已知的生物毒素，而另一些则很重要，因为它们可以用作海洋中各种物理，化学和生物过程的示踪剂。在这项研究中要测量的六个痕量元素可以说是海洋中最重要的生物活性痕量元素，它们的测量将提供有关北极生物学和物理过程的关键信息。该项目将在博士后研究人员的指导下进行，为早期职业科学家提供独特的专业发展机会。此外，这项研究将涉及对本科研究人员的培训，并为K-12教师和学生提供公众推广机会，以及在阿拉斯加的土著人口。在该项目下要测量的六种微量营养素都被确定为Geotraces计划的关键痕量元素。这项研究将允许对北极物理和生物学过程进行严格的测试，其中许多过程已经由于气候变化而经历了根本变化，这些过程控制了北极海洋中关键微量营养素金属的投入和命运。胶体分布是特异性的，以获取有关独特的物理化学形式和不同溶解金属池的反应性的其他信息。该项目还将通过测量海冰，雪，融化池塘以及紧邻海水下的海水中的这六种金属的浓度和尺寸分配来探索融化海冰在近地面浓度中的作用。鉴于北极是一个相对较小的盆地，周围是宽阔的大陆架子，沉积物和水槽也将在控制这些元素的分布中起主要作用。因此，还将从底部和丘基海海中的核心确定底部沉积物的孔隙水样品中的金属浓度，以研究底栖交换。

项目成果

期刊论文数量（3）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

The residence times of trace elements determined in the surface Arctic Ocean during the 2015 US Arctic GEOTRACES expedition

2015年美国北极GEOTRACES考察期间测定的微量元素在北冰洋表面的停留时间

DOI：
10.1016/j.marchem.2018.10.011
发表时间：
2018
期刊：
Marine Chemistry
影响因子：
3
作者：
Kadko, David;Aguilar-Islas, Ana;Bolt, Channing;Buck, Clifton S.;Fitzsimmons, Jessica N.;Jensen, Laramie T.;Landing, William M.;Marsay, Christopher M.;Rember, Robert;Shiller, Alan M.
通讯作者：
Shiller, Alan M.

Dissolved and particulate trace elements in late summer Arctic melt ponds