GEOTRACES Pacific Section: 227Ac Distribution in Deep Waters as a Constraint on Mixing and Mass Transport of Solutes
GEOTRACES 太平洋部分:深水中的 227Ac 分布作为溶质混合和传质的约束
基本信息
- 批准号:1235124
- 负责人:
- 金额:$ 14.74万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2013
- 资助国家:美国
- 起止时间:2013-06-01 至 2017-05-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Because of its potential as a tracer of ocean mixing and transport, 227Ac (22 year half-life) has been identified as a parameter of interest for the International GEOTRACES Program, a multi-national effort to map and study the geochemical behavior of a suite of trace elements and isotopes in the global ocean. Quantifying the biogeochemical dynamics of the deep sea is necessary for understanding the oceanic cycling of carbon and other materials. Defining these dynamics requires knowledge of mixing and advective transport rates that can be applied to interpret concentration fields of biogeochemically important solutes. Despite having a half-life that is well suited for the study of both vertical and lateral transport in the deep ocean, few 227Ac measurements have been made in the deep sea. In this project, a research team at the University of Southern California will make measurements of 227Ac water column profiles on the 2013 US GEOTRACES Pacific transect, a section from Peru to Tahiti, one of several American contributions to the International GEOTRACES effort. The team will also do analyses of archived sediments to constrain the regional benthic flux of this isotope and provide a boundary condition for interpreting its water column distribution. Recent advances in instrumentation facilitate this analysis, and the synergy provided by the GEOTRACES program will provide an ideal opportunity to obtain additional data that will serve two purposes. First, 227Ac will be of value in defining the spatial variability of mixing rates in the deep South Pacific, particularly when combined with estimates based on 228Ra (6 year half-life), a tracer field that a collaborating GEOTRACES proposal seeks to determine. Second, the mixing and transport rates defined by this tracer pair will be useful for deducing the transport and the dynamics of other solutes measured by GEOTRACES in deep waters. Solute transport is due to both mixing and advection. By using multiple tracers with different half-lives, the separate roles of these processes may be distinguished, allowing a more complete understanding of the dynamics of solute behaviors. Broader Impacts: As part of this effort, at least one undergraduate and one high school student will have the opportunity to participate in the research experience, gaining insight into the possibilities of careers in this area and learning the approaches taken in scientific research.
由于227 Ac(22年半衰期)具有作为海洋混合和运输示踪剂的潜力,因此已被确定为国际GEOTRACES计划的感兴趣参数,该计划是一项多国努力,旨在绘制和研究一系列微量元素的地球化学行为全球海洋中的元素和同位素。 量化深海的生物地球化学动力学对于了解碳和其他物质的海洋循环是必要的。 定义这些动态需要的混合和平流输送率,可以适用于解释浓度场的非地球化学的重要溶质的知识。 尽管227Ac的半衰期非常适合研究深海中的垂直和横向迁移,但在深海中进行的227Ac测量很少。 在该项目中,南加州大学的一个研究小组将测量2013年美国GEOTRACES太平洋样带(从秘鲁到塔希提岛的部分)的227 Ac水柱剖面,这是美国对国际GEOTRACES工作的几项贡献之一。 该小组还将对存档的沉积物进行分析,以限制这种同位素的区域海底通量,并为解释其水柱分布提供边界条件。 仪器方面的最新进展促进了这一分析,GEOTRACES计划提供的协同作用将提供一个理想的机会,以获得更多的数据,这将服务于两个目的。 首先,227 Ac将在确定南太平洋深处混合率的空间变异性方面具有价值,特别是当与基于228 Ra(6年半衰期)的估计相结合时,这是一个合作的GEOTRACES提案试图确定的示踪剂场。 其次,混合和运输率定义的示踪剂对将是有用的推导运输和动力学的其他溶质测量的GEOTRACES在深沃茨。 溶质输送是由于混合和平流。 通过使用具有不同半衰期的多种示踪剂,可以区分这些过程的单独作用,从而更完整地理解溶质行为的动力学。 更广泛的影响:作为这一努力的一部分,至少有一名本科生和一名高中生将有机会参与研究经验,深入了解这一领域职业的可能性,并学习科学研究中采取的方法。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Douglas Hammond其他文献
Publish or perish? A survey of abstracts accepted for meetings of the British Association of Oral and Maxillofacial Surgeons, and subsequently published
- DOI:
10.1016/j.bjoms.2009.08.037 - 发表时间:
2010-10-01 - 期刊:
- 影响因子:
- 作者:
Jonathan M. Collier;Navin Vig;Douglas Hammond - 通讯作者:
Douglas Hammond
Douglas Hammond的其他文献
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{{ truncateString('Douglas Hammond', 18)}}的其他基金
U.S. GEOTRACES Pacific Meridional Transect: Measurements of Actinium-227 to Trace Solute Transport
美国 GEOTRACES 太平洋经线横断面:通过测量 Actinium-227 来追踪溶质迁移
- 批准号:
1830168 - 财政年份:2018
- 资助金额:
$ 14.74万 - 项目类别:
Standard Grant
GEOTRACES Arctic Section: Actinium-227 as a Naturally-occurring Tracer of Dissolved Material Transport in the Arctic Ocean
GEOTRACES 北极部分:Actinium-227 作为北冰洋溶解物质运输的天然示踪剂
- 批准号:
1436958 - 财政年份:2014
- 资助金额:
$ 14.74万 - 项目类别:
Standard Grant
Collaborative Research: Use of Triple Oxygen Isotopes and O2/Ar to constrain Net/Gross Oxygen Production during upwelling and non-upwelling periods in a Coastal Setting
合作研究:使用三重氧同位素和 O2/Ar 来限制沿海地区上升流和非上升流期间的净/总氧气产量
- 批准号:
1260692 - 财政年份:2013
- 资助金额:
$ 14.74万 - 项目类别:
Standard Grant
Germanium Isotope Systematics in Marine Systems
海洋系统中的锗同位素系统学
- 批准号:
1061700 - 财政年份:2011
- 资助金额:
$ 14.74万 - 项目类别:
Standard Grant
COLLABORATIVE RESEARCH (USC-UW): Evaluating Seawater Circulation Rates Through Permeable Sediments, Using Naturally Occurring Rn and Ra Isotopes
合作研究 (USC-UW):利用天然存在的 Rn 和 Ra 同位素评估可渗透沉积物的海水循环率
- 批准号:
0623413 - 财政年份:2006
- 资助金额:
$ 14.74万 - 项目类别:
Standard Grant
Collaborative Research: Examination of the Potential Sources for the Mid-Water Silica Anomaly in the NE Pacific
合作研究:检查东北太平洋中层水体二氧化硅异常的潜在来源
- 批准号:
0452088 - 财政年份:2005
- 资助金额:
$ 14.74万 - 项目类别:
Standard Grant
Collaborative Research (OSU and USC): Evaluating the Utility of Germanium Isotopes as a Paleoproxy
合作研究(俄勒冈州立大学和南加州大学):评估锗同位素作为古代理的效用
- 批准号:
0326575 - 财政年份:2003
- 资助金额:
$ 14.74万 - 项目类别:
Standard Grant
The Use of 15NH3 to Estimate Fractionation of Nitrogen Isotopes during Diagenesis of Organic Matter
使用 15NH3 估算有机质成岩过程中氮同位素的分馏
- 批准号:
0136500 - 财政年份:2002
- 资助金额:
$ 14.74万 - 项目类别:
Standard Grant
Collaborative Studies (USC and UM): Fractionation of Ge and Si during Diagenesis, and its Implications for Regulating the Oceanic Ge/Si Ratio
合作研究(南加州大学和密歇根大学):成岩过程中 Ge 和 Si 的分馏及其对调节海洋 Ge/Si 比率的影响
- 批准号:
9911608 - 财政年份:2000
- 资助金额:
$ 14.74万 - 项目类别:
Standard Grant
Application of 222Rn as a Tracer to Study Gas Hydrate Dynamics
应用 222Rn 作为示踪剂研究天然气水合物动力学
- 批准号:
9730817 - 财政年份:1998
- 资助金额:
$ 14.74万 - 项目类别:
Continuing Grant
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