A Test of Secular Variations in Cosmic Radiation Using 36C1 in Pack Rat Middens

用36C1在狼群鼠巢中测试宇宙辐射的长期变化

基本信息

项目摘要

Recent U/TH and 14C measurements by Bard et al. (1990) on corals from Barbados have indicated that 20,000 years ago the activity of 14C in the atmosphere was approximately 50% higher than the modern activity. They ascribed this increase in activity to enhanced 14C productions due to more intense cosmic radiation as a result of a weaker terrestrial dipole magnetic field. We propose to test this origin for the 14C enhancement by reconstructing the deposition of another cosmogenic radionuclide, 36C1. A similar enhancement of the 36C1 would demonstrate that both nuclides were responding to production fluctuations. We propose to sample atmospheric 36C1 preserved in fossil packrat (Neotoma) urine in an arid site in western Nevada. This site contains a midden that has been 14C dated to cover the time interval 29,000 to 3,000 years before present. If strong correlation of the 36C1 and the Barbados 14C records is found, the 36C1 data might help to reconstruct atmospheric 14C activity during the period 30,000 to 20,000 years B.P., for which other data are scarce. We will also compare 36C1/C1 ratios in midden samples from western Nevada and other widely spread localities with meteoric 36C1 ratios in the same localities in order to establish the relationship between the rat urine and soil-water 36C1. In addition to addressing the problem of secular variations in cosmogenic nuclide production, the record of variation in meteoric 36C1 may provide a valuable dating agent for goundwater and soil water.
Bard等人(1990)最近对巴巴多斯珊瑚进行的U/TH和14C测量表明,2万年前大气中14C的活动比现代活动高约50%。他们将这种活动的增加归因于地球偶极磁场减弱导致的更强烈的宇宙辐射,从而增加了14C的产生。我们建议通过重建另一种宇宙形成放射性核素36C1的沉积来测试14C增强的起源。36C1的类似增强将表明,这两种核素都对产量波动作出反应。我们建议在内华达州西部的一个干旱地区取样保存在化石袋鼠(瘤)尿液中的大气36C1。这个遗址包含了一个14C年代的midden,覆盖了距今29000到3000年的时间间隔。如果发现36C1和巴巴多斯14C记录的强相关性,36C1数据可能有助于重建距今3万至2万年的大气14C活动,这一时期其他数据很少。我们还将比较内华达州西部和其他广泛分布地区的中部样本中的36C1/C1比率与同一地区的大气36C1比率,以建立大鼠尿液与土壤-水36C1之间的关系。除了解决宇宙核素产生的长期变化问题外,大气36C1变化的记录可能为地下水和土壤水提供有价值的定年剂。

项目成果

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Fred Phillips其他文献

Information theory as a unifying statistical approach for use in marketing research
信息论作为营销研究中使用的统一统计方法
  • DOI:
    10.1016/0377-2217(94)00355-g
  • 发表时间:
    1995
  • 期刊:
  • 影响因子:
    6.4
  • 作者:
    P. Brockett;A. Charnes;William W. Cooper;D. Learner;Fred Phillips
  • 通讯作者:
    Fred Phillips
THE PRODUCT IS DEAD: LONG LIVE THE PRODUCT-SERVICE!
产品已死:产品服务万岁!
  • DOI:
    10.1080/08956308.1999.11671295
  • 发表时间:
    1999
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Fred Phillips;L. Ochs;M. Schrock
  • 通讯作者:
    M. Schrock
Erratum to: Does the Accounting Profession Discipline Its Members Differently After Public Scrutiny?
  • DOI:
    10.1007/s10551-016-3358-5
  • 发表时间:
    2016-10-31
  • 期刊:
  • 影响因子:
    6.700
  • 作者:
    Devan Mescall;Fred Phillips;Regan N. Schmidt
  • 通讯作者:
    Regan N. Schmidt
Strategies and Tactics for Marketing New-to-the-World Products
营销新产品的策略和策略
  • DOI:
    10.1007/978-3-662-08500-4_9
  • 发表时间:
    2001
  • 期刊:
  • 影响因子:
    5.9
  • 作者:
    Fred Phillips
  • 通讯作者:
    Fred Phillips
Integrating accounting topics within or across functions: Effects on students’ structure and use of knowledge
  • DOI:
    10.1016/j.jaccedu.2005.08.002
  • 发表时间:
    2005-01-01
  • 期刊:
  • 影响因子:
  • 作者:
    Lori S. Kopp;Fred Phillips
  • 通讯作者:
    Fred Phillips

Fred Phillips的其他文献

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{{ truncateString('Fred Phillips', 18)}}的其他基金

A Test of Global and Antarctic Models for Cosmogenic-nuclide Production Rates using High-precision Dating of 40Ar/39Ar Lava Flows from Mount Erebus
使用埃里伯斯山 40Ar/39Ar 熔岩流高精度测年对全球和南极宇宙成因核素生产率模型进行测试
  • 批准号:
    1644234
  • 财政年份:
    2017
  • 资助金额:
    $ 11.54万
  • 项目类别:
    Standard Grant
Collaborative Research: Tectonic and climatic forcing of hydrological systems in the southern Great Basin: Implications for ancient and future aquatic system resilience
合作研究:大盆地南部水文系统的构造和气候强迫:对古代和未来水生系统恢复能力的影响
  • 批准号:
    1516680
  • 财政年份:
    2015
  • 资助金额:
    $ 11.54万
  • 项目类别:
    Continuing Grant
Collaborative Research: A Proposal for the Cosmic-Ray prOduced NUclide Systematics on Earth (CRONUS-Earth) Project
合作研究:地球上宇宙射线产生的核素系统学(CRONUS-Earth)项目的提案
  • 批准号:
    0345949
  • 财政年份:
    2005
  • 资助金额:
    $ 11.54万
  • 项目类别:
    Continuing Grant
Cosmogenic Nuclides Applied to Fault-Scarp Dating
宇宙成因核素应用于断层陡坡测年
  • 批准号:
    9980535
  • 财政年份:
    2000
  • 资助金额:
    $ 11.54万
  • 项目类别:
    Standard Grant
Cosmogenic Dating of Old, High Pluvial Shorelines in the Western Great Basin
西部大盆地古老、高洪积海岸线的宇宙成因测年
  • 批准号:
    0001063
  • 财政年份:
    2000
  • 资助金额:
    $ 11.54万
  • 项目类别:
    Continuing Grant
COLLABORATIVE RESEARCH: Development of Environmental Tracers for Water and Solute Transport in Arid Vadose Zones with Applications to Paleohydrology
合作研究:开发干旱渗流区水和溶质迁移的环境示踪剂及其在古水文学中的应用
  • 批准号:
    9614509
  • 财政年份:
    1997
  • 资助金额:
    $ 11.54万
  • 项目类别:
    Standard Grant
GRGC: Reconstruction of Water Balance Fluctuations During the Last Deglaciation Based on Glacial/Lacustrine Systems in the Western Great Basin
GRGC:基于西部大盆地冰川/湖泊系统重建末次冰消期水平衡波动
  • 批准号:
    9417810
  • 财政年份:
    1995
  • 资助金额:
    $ 11.54万
  • 项目类别:
    Continuing Grant
Determining the Uplift Rate of the Tibetan Plateau from Cosmogenic 36C1 in Volcanic Rocks
从火山岩中的宇宙成因36C1确定青藏高原的隆升速率
  • 批准号:
    9223802
  • 财政年份:
    1993
  • 资助金额:
    $ 11.54万
  • 项目类别:
    Standard Grant
The Extent of Early Versus Late Wisconsin Glaciation: A Test Using Cosmogenic 36C1 Dating
威斯康星州早期冰川作用与晚期冰川作用的范围:使用宇宙发生 36C1 测年的测试
  • 批准号:
    9117566
  • 财政年份:
    1992
  • 资助金额:
    $ 11.54万
  • 项目类别:
    Continuing Grant
Collaborative Research on Surface-Exposure Dating of a Quaternary Glacial Sequence for the White Mountains, CA-NV
白山第四纪冰川序列地表暴露测年合作研究,CA-NV
  • 批准号:
    8901437
  • 财政年份:
    1989
  • 资助金额:
    $ 11.54万
  • 项目类别:
    Continuing Grant

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