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GEOTRACES北极考察的研究人员将从北冰洋西部的各种海水和冰样本中测量铁、锰、锌、铜、镉和镍的浓度。这些通常被称为“微量营养素”，因为它们在海洋中的浓度极低，而且对海洋生物至关重要。与国际地理追踪计划中的其他国家举措一样，美国北极探险的目标是识别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，并确定这些分布对变化的敏感性。环境条件。有些微量元素是生命所必需的，有些是已知的生物毒素，还有一些很重要，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。本研究要测量的六种微量元素可以说是海洋中最重要的生物活性微量元素，它们的测量将为北极的生物和物理过程提供关键信息。该项目将在博士后研究员的指导下进行，为早期职业科学家提供独特的专业发展机会。此外，该研究还将培训一名本科生研究员，并向K-12教师和学生以及阿拉斯加土著居民提供公共宣传机会。该项目要测量的六种微量营养素均已被确定为关键微量元素GEOTRACES 计划。这项研究将能够对北极的物理和生物过程进行严格的测试，其中许多过程已经因气候变化而发生根本性的变化，这些变化控制着北冰洋中关键微量营养素金属的输入和命运。胶体分布是专门针对的，以便获得有关不同溶解金属池的独特物理化学形式和反应性的附加信息。该项目还将通过测量海冰、雪、融化的池塘以及紧邻海冰下方的海水中这六种金属的浓度和尺寸分配，探索海冰融化在驱动这些元素近地表浓度方面的作用。鉴于北极是一个相对较小的盆地，周围环绕着广阔的大陆架，沉积物源和汇也将在控制这些元素的分布方面发挥重要作用。因此，也将从白令海和楚科奇海的岩心中测定底部沉积物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）

Dissolved and particulate trace elements in late summer Arctic melt ponds

夏末北极融化池中的溶解和颗粒微量元素

DOI：
10.1016/j.marchem.2018.06.002
发表时间：
2018-08
期刊：
Marine Chemistry
影响因子：
3
作者：
Marsay, Chris M.;Aguilar;Fitzsimmons, Jessica N.;Hatta, Mariko;Jensen, Laramie T.;John, Seth G.;Kadko, David;Landing, William M.;Lanning, Nathan T.;Morton, Peter L.;et al
通讯作者：
et al

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：
2018-11
期刊：
Marine Chemistry
影响因子：
3
作者：
Kadko, David;Aguilar;Bolt, Channing;Buck, Clifton S.;Fitzsimmons, Jessica N.;Jensen, Laramie T.;Landing, William M.;Marsay, Christopher M.;Rember, Robert;Shiller, Alan M.;et al
通讯作者：
et al

Arctic Deep Water Ferromanganese-Oxide Deposits Reflect the Unique Characteristics of the Arctic Ocean: AMERASIA ARCTIC OCEAN Fe-Mn DEPOSITS

北极深水锰氧化物矿床反映了北冰洋的独特特征：美洲、北冰洋铁锰矿床

DOI：
10.1002/2017gc007186
发表时间：
2017-11
期刊：
Geosystems
影响因子：
0
作者：
Hein, James R.;Konstantinova, Natalia;Mikesell, Mariah;Mizell, Kira;Fitzsimmons, Jessica N.;Lam, Phoebe J.;Jensen, Laramie T.;Xiang, Yang;Gartman, Amy;Cherkashov, Georgy;et al
通讯作者：
et al