A Proposal for the Study of Geomagnetic Modulation of the Pleistocene Cosmic-Ray Flux by Measurement of 10Be from Blake Outer Ridge Marine Sediment

通过测量布莱克外脊海洋沉积物中的 10Be 研究更新世宇宙射线通量的地磁调制的建议

• 批准号: 0003370
• 负责人: Lanny McHargue
• 金额: $ 22.24万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-02-15 至 2004-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0003370&HistoricalAwards=false
• 关键词: Proposal; Study; Geomagnetic; Modulation; Pleistocene

The investigators will study the cosmic ray flux incident upon Earth during the Pleistocene epoch. The main effort is to measure the cosmogenic radionuclide 10Be in samples of sea sediment obtained from the Blake Outer Ridge, together with other relevant physical and chemical properties of the sediments. Prior work by the investigators has demonstrated that the concentration of 10Be varies inversely with measures of the paleo magnetic field (paleointensity) of the sediments, and that it is unlikely that this relationship arises from climate forcing. Extension of the high-resolution record will address several problems raised by the earlier work. Specifically, the investigators will concentrate on understanding the Laschamp geomagnetic excursion (41,000 years ago) and the Blake Event (115,000 years ago).

研究人员将研究更新世时期发生在地球上的宇宙射线流。主要工作是测量从布莱克外脊获得的海洋沉积物样品中的宇宙成因放射性核素10Be，以及沉积物的其他相关物理和化学性质。研究人员先前的工作已经证明，10Be的浓度与沉积物的古磁场（古强度）的测量成反比，而且这种关系不太可能是由气候强迫引起的。高分辨率记录的扩展将解决早期工作中提出的几个问题。具体来说，研究人员将集中精力了解拉尚地磁偏移（41,000年前）和布莱克事件（115,000年前）。