COLLABORATIVE RESEARCH: Site Survey for Subglacial Bedrock Exposure Dating at the Margin of the Wilkes Basin in Northern Victoria Land

合作研究:维多利亚州北部威尔克斯盆地边缘冰下基岩暴露年代测定现场调查

基本信息

  • 批准号:
    1744844
  • 负责人:
  • 金额:
    $ 13.19万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2021
  • 资助国家:
    美国
  • 起止时间:
    2021-09-01 至 2024-08-31
  • 项目状态:
    已结题

项目摘要

The goal of this project is to establish, through direct geological evidence, whether complete deglaciation of East Antarctic marine basins took place during past warm-climate periods. Direct geological information about whether the Antarctic Ice Sheet responded catastrophically to past climate changes is important to evaluating the likelihood of significant ice-sheet response to future climate change. The team will assess the feasibility of achieving this goal using cosmogenic-nuclide measurements on bedrock that is currently buried under the ice sheet. They will conduct a reconnaissance and site survey to identify potential drill sites where subglacial bedrock-exposure dating could subsequently be used to test whether ice at those sites was absent when the Earth last experienced current levels of carbon dioxide—at approximately 3.0 to 3.3 million years ago.This project will seek out potential sites that can address whether total deglaciation of subglacial basins in coastal East Antarctica took place during past warm-climate periods like the middle Pliocene warm period at circa 3.0-3.3 Ma. Ice-sheet model simulations have identified marine ice-margin instability as a possible cause for higher eustatic sea level during this period. In general, it is difficult to obtain direct and unambiguous geological evidence that an ice sheet was smaller in the past because if such evidence exists it is most likely inaccessible beneath the present ice sheet. One means of overcoming this problem is to search for significant concentrations of cosmic-ray-produced radionuclides in bedrock surfaces beneath the present ice sheet. Such concentrations can only be produced if the surface is ice-free, so significant cosmogenic-nuclide concentrations would provide incontrovertible evidence that the ice sheet was smaller in the past, and, in addition, can provide information about when this occurred. Guided by ice-sheet model simulations of Pliocene deglaciation to identify areas where complete deglaciation of the Wilkes subglacial basin would cause substantial changes in the extent of bedrock exposure, the team will collect geophysical and geochemical data to identify and evaluate sites with potential for future bedrock recovery.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
该项目的目标是通过直接的地质证据确定南极东部海洋盆地在过去的温暖气候时期是否发生了完全的冰川消退。关于南极冰盖是否对过去的气候变化做出灾难性反应的直接地质信息对于评估冰盖对未来气候变化做出重大反应的可能性非常重要。该小组将利用目前埋藏在冰盖下的基岩的宇宙生成核素测量来评估实现这一目标的可行性。 他们将进行勘察和现场调查,以确定潜在的钻探地点,随后可以使用冰下岩石暴露年代测定法来测试这些地点的冰是否在地球上一次经历目前的二氧化碳水平时不存在。该项目将寻找潜在的地点,以解决南极洲东部沿海冰下盆地的冰川消融是否发生在大约300万至330万年前。在过去的温暖气候时期,如上新世中期温暖时期,约3.0-3.3 Ma。冰盖模型模拟已经确定,海洋冰缘不稳定是这一时期海平面上升的可能原因。一般来说,很难获得直接和明确的地质证据来证明过去的冰盖较小,因为如果存在这样的证据,很可能在现在的冰盖下无法进入。克服这一问题的一种方法是在目前冰盖下的基岩表面寻找宇宙射线产生的放射性核素的显着浓度。 只有在表面没有冰的情况下才能产生这样的浓度,因此显着的宇宙生成核素浓度将提供无可争议的证据,表明过去冰盖较小,此外,还可以提供有关何时发生这种情况的信息。 在冰盖模型模拟上新世冰消作用的指导下,确定威尔克斯冰下盆地完全冰消作用将导致基岩暴露程度发生重大变化的地区,该小组将收集地球物理和地球化学数据,以确定和评估具有未来基岩恢复潜力的地点。该奖项反映了NSF的法定使命,并被认为值得通过使用基金会的知识价值和更广泛的影响审查标准。

项目成果

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Gregory Balco其他文献

Gregory Balco的其他文献

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{{ truncateString('Gregory Balco', 18)}}的其他基金

Targeted Basic Research to Enable Antarctic Science Applications of Cosmogenic-Nuclide Geochemistry
有针对性的基础研究使宇宙成因核素地球化学在南极科学应用成为可能
  • 批准号:
    2139497
  • 财政年份:
    2022
  • 资助金额:
    $ 13.19万
  • 项目类别:
    Standard Grant
COLLABORATIVE RESEARCH: A TRANSPARENT-MIDDLE-LAYER COMPUTATIONAL AND DATA MANAGEMENT INFRASTRUCTURE FOR SYNOPTIC APPLICATIONS OF COSMOGENIC-NUCLIDE GEOCHEMISTRY
合作研究:宇宙成因核素地球化学概要应用的透明中间层计算和数据管理基础设施
  • 批准号:
    1948416
  • 财政年份:
    2020
  • 资助金额:
    $ 13.19万
  • 项目类别:
    Continuing Grant
Collaborative Research: Reconstructing Temperatures during the Mid-Pliocene Warm Period in the McMurdo Dry Valleys with Cosmogenic Noble Gases
合作研究:用宇宙成因惰性气体重建麦克默多干谷中上新世温暖期的温度
  • 批准号:
    1935907
  • 财政年份:
    2020
  • 资助金额:
    $ 13.19万
  • 项目类别:
    Standard Grant
Synoptic Evaluation of Long-Term Antarctic Ice Sheet Model Simulations using a Continent-Wide Database of Cosmogentic-Nuclide Measurements
使用全大陆宇宙成因核素测量数据库对长期南极冰盖模型模拟进行天气评估
  • 批准号:
    1744771
  • 财政年份:
    2018
  • 资助金额:
    $ 13.19万
  • 项目类别:
    Standard Grant
Collaborative Research: Long Term Sublimation/Preservation of Two Separate, Buried Glacier Ice Masses, Ong Valley, Southern Transantarctic Mountains
合作研究:跨南极山脉南部翁谷两个独立的埋藏冰川冰块的​​长期升华/保存
  • 批准号:
    1445168
  • 财政年份:
    2016
  • 资助金额:
    $ 13.19万
  • 项目类别:
    Standard Grant
COLLABORATIVE RESEARCH: Resolving Ambiguous Exposure-Age Chronologies of Antarctic Deglaciation with Measurements of In-Situ-Produced Cosmogenic Carbon-14
合作研究:通过测量原位产生的宇宙成因碳 14 来解决南极冰川消融的模糊暴露年龄年表
  • 批准号:
    1542976
  • 财政年份:
    2016
  • 资助金额:
    $ 13.19万
  • 项目类别:
    Standard Grant
Collaborative Research: Potential Direct Geologic Constraint of Ice Sheet Thickness in the Central Transantarctic Mountains during the Pliocene Warm Period
合作研究:上新世温暖期横贯南极中部山脉冰盖厚度的潜在直接地质约束
  • 批准号:
    1443329
  • 财政年份:
    2015
  • 资助金额:
    $ 13.19万
  • 项目类别:
    Standard Grant
COLLABORATIVE RESEARCH: Terrestrial Exposure-Age Constraints on the last Glacial Maximum Extent of the Antarctic Ice Sheet in the Western Ross Sea
合作研究:西罗斯海南极冰盖末次冰期最大范围的陆地暴露年龄限制
  • 批准号:
    1341420
  • 财政年份:
    2014
  • 资助金额:
    $ 13.19万
  • 项目类别:
    Standard Grant
Antarctic Peninsula Exhumation and Landscape Development Investigated by Low-temperature Detrital Thermochronometry
低温碎屑测温法研究南极半岛折返和景观发育
  • 批准号:
    1246484
  • 财政年份:
    2012
  • 资助金额:
    $ 13.19万
  • 项目类别:
    Standard Grant
Collaborative Research: P2C2--Synchronizing the North American Varve Chronology and the Greenland Ice Core Record Using Meteoric 10Be Flux
合作研究:P2C2——使用流星 10Be 通量同步北美 Varve 年代学和格陵兰冰芯记录
  • 批准号:
    1103037
  • 财政年份:
    2011
  • 资助金额:
    $ 13.19万
  • 项目类别:
    Standard Grant

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