Particle Export Fields in the Arabian Sea Derived from 234TH: 238U Disequilibria

阿拉伯海中源自 234TH 的粒子输出场:238U 不平衡

基本信息

  • 批准号:
    9310702
  • 负责人:
  • 金额:
    $ 47.58万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    1994
  • 资助国家:
    美国
  • 起止时间:
    1994-11-01 至 1998-01-31
  • 项目状态:
    已结题

项目摘要

9310702 Buesseler One of the major research objectives of the U.S.JGOFS Arabian Sea Process Study is measurement of the vertical and horizontal transport rates of particulate material, especially particulate organic carbon, in the Arabian Sea. Particle export from the surface layers of the ocean is of particular interest because that is the zone where new biological particles are formed, grazed, and physically altered, and then enter the decomposition cycle that regenerates dissolved nutrients. Although some investigators will be making such estimates by setting out open canisters at different depths and measuring the amount of material that collects in them over time, such efforts have a number of built-in uncertainties. The principal investigator of the present project, will approach the problem of estimating particle export from the surface ocean in a radically different way, on that will serve as an independent check on the sediment trap estimates. His approach takes advantage of the fact that the dissolved uranium in seawater decays to produce a radioactive daughter, thoraium- 234 (half-life-24 days), which (unlike the uranium) strongly attaches to particles. By sampling particles within and below the mixed upper water layer and measuring their TH-234 content and using some simple mathematical models, the investigator will be able to estimate particle from the mixed layer to depth. By measuring carbon and nitrogen contents of these materials, he will also be able to estimate fluxes of those two elements. A regional particulate carbon flux picture for the Arabian Sea region will be built up by using the data from some 25 stations collected during two monsoonal seasons (summer and winter) and two intermonsoonal periods. ***
9310702 Buesseler美国JGOFS阿拉伯海过程研究的主要研究目标之一是测量阿拉伯海颗粒物质,特别是颗粒有机碳的垂直和水平输送速率。从海洋表层输出颗粒特别令人感兴趣,因为那里是新的生物颗粒形成、擦拭和物理变化的区域,然后进入分解循环,重新生成溶解的营养物质。尽管一些调查人员会通过在不同深度放置敞开的罐子,并测量随着时间的推移收集在其中的材料数量来进行这样的估计,但这样的努力存在许多内在的不确定性。本项目的首席调查员将以一种截然不同的方式处理估计表层海洋颗粒输出的问题,这将作为对沉积物捕捉器估计的独立检查。他的方法利用了这样一个事实,即海水中溶解的铀会衰变,产生放射性的子体--Touraium-234(半衰期为24天),与铀不同,它强烈地附着在粒子上。通过对混合上层内和之下的颗粒进行采样,测量其TH-234含量,并使用一些简单的数学模型,研究人员将能够估计从混合层到深度的颗粒。通过测量这些材料的碳和氮含量,他还将能够估计这两种元素的通量。将利用在两个季风季(夏季和冬季)和两个季风期收集的大约25个站的数据,建立阿拉伯海地区的区域颗粒碳通量图。***

项目成果

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Michael Bacon其他文献

The dangers of volunteer work in rural Asia — Acute lung injury as the first manifestation of Weil's disease
  • DOI:
    10.1016/j.ejim.2008.06.006
  • 发表时间:
    2008-12-01
  • 期刊:
  • 影响因子:
  • 作者:
    Nic Wennike;Michael Bacon
  • 通讯作者:
    Michael Bacon
A Defence of Liberal Ironism

Michael Bacon的其他文献

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{{ truncateString('Michael Bacon', 18)}}的其他基金

Mass Spectrometric Measurements of 231 Pa and 230 Th in the Water Column of the Tropical Atlantic: Evaluation of Water Mass Ventilation Ages and Boundary Scavenging
热带大西洋水柱中 231 Pa 和 230 Th 的质谱测量:水体通气年龄和边界清除的评估
  • 批准号:
    9811260
  • 财政年份:
    1998
  • 资助金额:
    $ 47.58万
  • 项目类别:
    Standard Grant
Thorium Isotopes as Indicators of Export Flux and Particle Dynamics in the Southern Ocean: Joint Global Ocean Flux Study
钍同位素作为南大洋输出通量和粒子动力学的指标:全球海洋通量联合研究
  • 批准号:
    9530720
  • 财政年份:
    1996
  • 资助金额:
    $ 47.58万
  • 项目类别:
    Continuing Grant
Acquisition of Mass Spectrometers for Trace Elements and Isotopic Research in Marine and Earth Sciences
购置质谱仪用于海洋和地球科学中的微量元素和同位素研究
  • 批准号:
    9601587
  • 财政年份:
    1996
  • 资助金额:
    $ 47.58万
  • 项目类别:
    Standard Grant
U.S. JGOFS Data Management
美国 JGOFS 数据管理
  • 批准号:
    9417423
  • 财政年份:
    1995
  • 资助金额:
    $ 47.58万
  • 项目类别:
    Continuing Grant
Determination of Thorium-230 and Protactinum-231 in Ocean Waters by Isotope-Dilution Mass Spectrometry
同位素稀释质谱法测定海水中的钍 230 和镤 231
  • 批准号:
    9415562
  • 财政年份:
    1995
  • 资助金额:
    $ 47.58万
  • 项目类别:
    Continuing Grant
Reconstruction of Particle Paleofluxes to the Seafloor by 230Th and 231Pa Profiling in Deep-Sea Sediments
通过深海沉积物中的 230Th 和 231Pa 剖面重建海底的粒子古通量
  • 批准号:
    9200780
  • 财政年份:
    1992
  • 资助金额:
    $ 47.58万
  • 项目类别:
    Continuing Grant
Reactive Radionuclides in the Eastern North Atlantic, Joint Global Ocean Flux Study
北大西洋东部的活性放射性核素,全球海洋通量联合研究
  • 批准号:
    9016494
  • 财政年份:
    1991
  • 资助金额:
    $ 47.58万
  • 项目类别:
    Standard Grant
Reactive Radionuclides as Indicators of New Production and Particle Transformation in the Equatorial Pacific Water Column: Joint Global Ocean Flux Study
反应放射性核素作为赤道太平洋水体新产生和粒子转化的指标:全球海洋通量联合研究
  • 批准号:
    9022284
  • 财政年份:
    1991
  • 资助金额:
    $ 47.58万
  • 项目类别:
    Continuing Grant
Reactive Radionuclides in the Eastern North Atlantic, Joint Global Ocean Flux Study
北大西洋东部的活性放射性核素,全球海洋通量联合研究
  • 批准号:
    8817836
  • 财政年份:
    1989
  • 资助金额:
    $ 47.58万
  • 项目类别:
    Continuing Grant
Marine Geochemistry of Reactive Radiouclides
活性放射性核素的海洋地球化学
  • 批准号:
    8800620
  • 财政年份:
    1988
  • 资助金额:
    $ 47.58万
  • 项目类别:
    Standard Grant

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