Firn Accumulation Processes in Taylor Dome, Vostok and Siple Dome Ice Using Cosmogenic 14 C and 10Be as Tracers

使用 Cosmogenic 14 C 和 10Be 作为示踪剂在 Taylor Dome、Vostok 和 Siple Dome 冰中进行云积聚过程

基本信息

项目摘要

9909484LalThis award is for support for three years of funding to develop a history of snow accumulation and physical processes occurring in the upper layers of ice deposited at several sites in Antarctica, using cosmogenic in-situ Carbon-14 (14C) and cosmogenic Beryllium-10 (10Be) as radiotracers. The proposed research emerges from recent studies of cosmogenic in-situ 14C in GISP2 Holocene and several Antarctic ice samples, which revealed marked differences in the 14C concentrations in the samples, compared to the theoretically expected values. The GISP2 samples have about the expected amount of 14C but the Antarctic samples are deficient by 30-50% or more. These results suggest that in slowly accumulating ice samples (such as occur in Antarctica), the cosmic ray implanted 14C is somehow partially lost, but quantitatively preserved in samples from areas of high accumulation. These results suggest that after deposition of the cosmogenic 14C, its concentration is decreased in firn due to processes such as recrystallization, sublimation/evaporation and redeposition. In order to quantify these processes, the atmospheric cosmogenic 10Be in ice samples will also be measured. Since 10Be and 14C have different responses to the firnification processes, their simultaneous study can help to elucidate the nature and importance of these processes. Samples from Taylor Dome, Vostok and Siple Dome will all be studied.
9909484 Lal该奖项是为了支持三年的资助,以开发南极洲几个地点沉积的上层冰层中发生的积雪和物理过程的历史,使用宇宙成因的原位碳-14(14 C)和宇宙成因的铍-10(10 Be)作为放射性示踪剂。 拟议的研究出现在最近的研究宇宙成因原位14 C在GISP 2全新世和几个南极冰样品,其中显示显着差异的14 C浓度的样品,相比,理论上的预期值。 GISP 2样品中的14 C含量与预期的相当,但南极样品中的14 C含量不足30-50%或更多。 这些结果表明,在缓慢积累的冰样品中(例如在南极洲发生的),宇宙射线注入的14 C以某种方式部分丢失,但在高积累区域的样品中定量保存。 这些结果表明,宇宙成因的14 C沉积后,其浓度下降,在积雪由于过程,如重结晶,升华/蒸发和再沉积。 为了量化这些过程,还将测量冰样品中的大气宇宙成因10 Be。 由于~(10)Be和~(14)C对土壤固化过程有不同的响应,对它们的同时研究有助于阐明这些过程的性质和重要性。 来自泰勒穹、沃斯托克和西普尔穹的样本都将被研究。

项目成果

期刊论文数量(0)
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Devendra Lal其他文献

Deconvolution of the atmospheric radiocarbon record in the last 50,000 years
过去 5 万年大气放射性碳记录的反卷积
Assessing past climate changes from proxy records: an iterative process between discovery and observations
  • DOI:
    10.1016/s1040-6182(03)00111-3
  • 发表时间:
    2004
  • 期刊:
  • 影响因子:
    2.2
  • 作者:
    Devendra Lal
  • 通讯作者:
    Devendra Lal
On the fluxes and fates of <sup>3</sup>He accreted by the Earth with extraterrestrial particles
  • DOI:
    10.1016/j.epsl.2005.04.011
  • 发表时间:
    2005-06-30
  • 期刊:
  • 影响因子:
  • 作者:
    Devendra Lal;Anthony J.T. Jull
  • 通讯作者:
    Anthony J.T. Jull

Devendra Lal的其他文献

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{{ truncateString('Devendra Lal', 18)}}的其他基金

Solar Activity during the Last Millennium, Estimated from Cosmogenic in-situ 14C in South Pole and GISP2 Ice Cores
根据南极宇宙成因原位 14C 和 GISP2 冰芯估算的上个千年的太阳活动
  • 批准号:
    0538683
  • 财政年份:
    2006
  • 资助金额:
    $ 15.03万
  • 项目类别:
    Standard 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:
    0345629
  • 财政年份:
    2005
  • 资助金额:
    $ 15.03万
  • 项目类别:
    Continuing Grant
Paleo-Ocean Chemistry Based on Trace Element Records in Marine Sedimentary Opal: Implications for Aeolian Fluxes and the Effect of Fe on Biological Productivity
基于海洋沉积蛋白石中痕量元素记录的古海洋化学:风通量的影响以及铁对生物生产力的影响
  • 批准号:
    0454870
  • 财政年份:
    2005
  • 资助金额:
    $ 15.03万
  • 项目类别:
    Standard Grant
Accumulation Histories of GISP2 Ice During the Last Glacial Period: Record Based on In-Situ Produced 14 C
末次冰期GISP2冰的堆积历史:基于原位产生的14 C记录
  • 批准号:
    9905299
  • 财政年份:
    1999
  • 资助金额:
    $ 15.03万
  • 项目类别:
    Standard Grant
Climate and Cosmic Ray Flux Coupled Models for Tropospheric Fallout of Cosmogenic 10Be, 36 C1 and 26 A1: Understanding their Archival Records in Polar and Temperate Ice Cores
宇宙成因 10Be、36 C1 和 26 A1 对流层沉降物的气候和宇宙线通量耦合模型:了解它们在极地和温带冰芯中的档案记录
  • 批准号:
    9905467
  • 财政年份:
    1999
  • 资助金额:
    $ 15.03万
  • 项目类别:
    Standard Grant
The Record of Cosmogenic In-situ and Atmospheric 14C in GISP2 Ice Core
GISP2 冰芯中宇宙成因原位和大气 14C 的记录
  • 批准号:
    9530897
  • 财政年份:
    1996
  • 资助金额:
    $ 15.03万
  • 项目类别:
    Standard Grant
In-Depth Study of Cosmogenic in Situ 14CO, 14CO2 and Atmospheric CO2 in GISP II Firn and Ice
GISP II 冰和冰中原位 14CO、14CO2 和大气 CO2 宇宙成因的深入研究
  • 批准号:
    9321448
  • 财政年份:
    1994
  • 资助金额:
    $ 15.03万
  • 项目类别:
    Continuing Grant
Development of the in-situ cosmogenic 14C method for studying geomorphic processes
开发用于研究地貌过程的原位宇宙成因 14C 方法
  • 批准号:
    9304193
  • 财政年份:
    1993
  • 资助金额:
    $ 15.03万
  • 项目类别:
    Continuing Grant
Critical Studies of Uranium and Trace Element Coral- Geochemistry to Determine their Reliability as Paleoclimate Recorders
对铀和微量元素珊瑚地球化学进行批判性研究,以确定其作为古气候记录器的可靠性
  • 批准号:
    9304187
  • 财政年份:
    1993
  • 资助金额:
    $ 15.03万
  • 项目类别:
    Standard Grant
Nuclear Studies of Accumulating and Ablation Ice Using Cosmogenic 14C
使用宇宙 14C 积聚和消融冰的核研究
  • 批准号:
    9219931
  • 财政年份:
    1993
  • 资助金额:
    $ 15.03万
  • 项目类别:
    Continuing Grant

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