EXPROBE-WAIS: Exposed Rock Beneath the West Antarctic Ice Sheet, A Test for Interglacial Ice Sheet Collapse
EXPROBE-WAIS:南极西部冰盖下裸露的岩石,对间冰期冰盖崩塌的测试
基本信息
- 批准号:1341728
- 负责人:
- 金额:$ 37.68万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2015
- 资助国家:美国
- 起止时间:2015-07-01 至 2019-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Stone/1341728This award supports a project to determine if the West Antarctic Ice Sheet (WAIS) has thinned and collapsed in the past and if so, when did this occur. This topic is of interest to geologists who have long been studying the history and behavior of ice sheets (including the WAIS) in order to determine what climatic conditions allow an ice sheet to survive and what conditions have caused them to collapse in the past. The bulk of this research has focused on the last ice age, when climate conditions were far colder than the present; this project will focus on the response of ice sheets to warmer climates in the past. A new and potentially transformative approach that uses the analysis of atoms transformed by cosmic-rays in bedrock beneath the WAIS will allow a definitive test for ice free conditions in the past. This is because the cosmic rays capable of producing the necessary reactions can penetrate only a few meters through glacier ice. Therefore, if they are detected in samples from hundreds of meters below the current ice sheet surface this would provide definitive proof of mostly ice-free conditions in the past. The concentrations of different cosmic ray products in cores from different depths will help answer the question of how frequently bedrock has been exposed, how much the ice sheet has thinned, and which time periods in the past produced climatic conditions capable of making the ice sheet unstable.Short bedrock cores beneath the ice sheet near the Pirrit Hills in West Antarctica will be collected using a new agile sub-ice geological drill (capable of drilling up to 200 meters beneath the ice surface) that is being developed by the Ice Drilling Program Office (IDPO) to support this and other projects. Favorable drilling sites have already been identified based on prior reconnaissance mapping, sample analysis and radar surveys of the ice-sheet bed. The cores collected in this study will be analyzed for cosmic-ray-produced isotopes of different elements with a range of half-lives from 5700 yr (C-14) to 1.4 Myr (Be-10), as well as stable Ne-21. The presence or absence of these isotopes will provide a definitive test of whether bedrock surfaces were ice-free in the past and due to their different half-lives, ratios of the isotopes will place constraints on the age, frequency and duration of past exposure episodes. Results from bedrock surfaces at different depths will indicate the degree of past ice-sheet thinning. The aim is to tie evidence of deglaciation in the past to specific periods of warmer climate and thus to gauge the ice sheet's response to known climate conditions. This project addresses the broad question of ice-sheet sensitivity to climate warming, which previously has been largely determined indirectly from sea-level records. In contrast, this project will provide direct measurements that provide evidence of ice-sheet thinning in West Antarctica. Results from this work will help to identify the climatic factors and thresholds capable of endangering the WAIS in future. The project will make a significant contribution to the ongoing study of climate change, ice-sheet melting and associated sea-level rise. This project has field work in Antarctica.
Stone/1341728该奖项支持一个项目,以确定西南极冰盖(WAIS)是否在过去变薄和崩溃,如果是这样,什么时候发生的。 这个主题是感兴趣的地质学家谁一直在研究的历史和行为的冰盖(包括WAIS),以确定什么样的气候条件允许冰盖生存和什么条件导致他们在过去崩溃。 这项研究的大部分集中在上一个冰河时代,当时的气候条件比现在冷得多;这个项目将集中在过去冰盖对温暖气候的反应。 一种新的和潜在的变革性的方法,使用原子的分析,宇宙射线转化的基岩下的WAIS将允许一个明确的测试,在过去的无冰条件。 这是因为能够产生必要反应的宇宙射线只能穿透冰川冰几米。 因此,如果在当前冰盖表面以下数百米处的样本中检测到它们,这将为过去大部分无冰条件提供明确的证据。 不同深度的岩芯中不同宇宙射线产物的浓度将有助于回答基岩暴露的频率,冰盖变薄的程度,以及在过去的哪个时期产生了能够使冰盖不稳定的气候条件。将使用一种新的灵活的冰下地质钻来收集南极洲西部皮里特山附近冰盖下的短基岩岩心(能够在冰面下钻探200米),该项目由冰钻项目办公室(IDPO)开发,以支持该项目和其他项目。根据先前的勘测绘图、样本分析和冰盖床的雷达测量,已经确定了有利的钻探地点。 在这项研究中收集的核心将分析宇宙射线产生的不同元素的同位素,其半衰期范围从5700年(C-14)到140万年(Be-10),以及稳定的Ne-21。 这些同位素的存在与否将提供一个明确的测试是否基岩表面是无冰在过去,由于其不同的半衰期,同位素的比例将限制的年龄,频率和持续时间的过去曝光事件。 不同深度的基岩表面的结果将表明过去冰盖变薄的程度。 其目的是将过去冰川消退的证据与特定的气候变暖时期联系起来,从而衡量冰盖对已知气候条件的反应。该项目解决了冰盖对气候变暖的敏感性这一广泛问题,以前主要是通过海平面记录间接确定的。 相比之下,该项目将提供直接测量,提供南极洲西部冰盖变薄的证据。这项工作的结果将有助于确定未来可能危及WAIS的气候因素和阈值。 该项目将对正在进行的关于气候变化、冰盖融化和相关的海平面上升的研究作出重大贡献。这个项目在南极洲有实地工作。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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John Stone其他文献
Science, Technology and the Military: Priorities, Preoccupations and Possibilities
科学、技术和军事:优先事项、关注点和可能性
- DOI:
- 发表时间:
2008 - 期刊:
- 影响因子:0
- 作者:
B. Rappert;B. Balmer;John Stone - 通讯作者:
John Stone
A Post-Racial America: Myth or Reality?
后种族美国:神话还是现实?
- DOI:
- 发表时间:
2009 - 期刊:
- 影响因子:0
- 作者:
C. Fritz;John Stone - 通讯作者:
John Stone
WED-152 Design and study population of MITIGATE: the first multinational randomized controlled clinical trial in IgG4 related disease, evaluating the efficacy and safety of the CD19 B cell depleting agent inebilizumab
- DOI:
10.1016/s0168-8278(24)02011-7 - 发表时间:
2024-06-01 - 期刊:
- 影响因子:
- 作者:
John Stone;Emma Culver;Arezou Khosroshahi;Wen Zhang;Emanuel Della Torre;Kazuichi Okazaki;Yoshiya Tanaka;Matthias Lohr;Nicolas Schleinitz;Lingli Dong;Hisanori Umehara;Marco Lanzillotta;Zachary Wallace;Mikael Ebbo;George Webster;Yanping Wu;Daniel Cimbora;Nishi Rampal - 通讯作者:
Nishi Rampal
Portable Ultraviolet-C Chambers for Inactivation of
SARS-CoV-2
用于灭活 SARS-CoV-2 的便携式紫外线 C 室
- DOI:
10.6028/jres.126.056 - 发表时间:
2022 - 期刊:
- 影响因子:1.5
- 作者:
Shelby Claytor;R. Campbell;Ashton Hattori;E. Brown;Christopher Hollis;Max Schureck;Howard Atchley;John Stone;Michael Grady;Benjamin B. Yang;T. Harris - 通讯作者:
T. Harris
Race, Ethnicity, and the Weberian Legacy
种族、民族和韦伯遗产
- DOI:
- 发表时间:
1995 - 期刊:
- 影响因子:0
- 作者:
John Stone - 通讯作者:
John Stone
John Stone的其他文献
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{{ truncateString('John Stone', 18)}}的其他基金
Collaborative Research: High-resolution Reconstruction of Holocene Deglaciation in the Southern Ross Embayment
合作研究:南罗斯湾全新世冰川消退的高分辨率重建
- 批准号:
1443346 - 财政年份:2016
- 资助金额:
$ 37.68万 - 项目类别:
Standard Grant
Collaborative Research: Assessing the Antarctic Contribution to Sea-level Changes during the Last Deglaciation: Constraints from Darwin Glacier
合作研究:评估末次冰消期南极对海平面变化的贡献:达尔文冰川的限制
- 批准号:
1246110 - 财政年份:2013
- 资助金额:
$ 37.68万 - 项目类别:
Standard Grant
Erosion beneath Pleistocene Glaciers and Ice Sheets
更新世冰川和冰盖下的侵蚀
- 批准号:
1252224 - 财政年份:2013
- 资助金额:
$ 37.68万 - 项目类别:
Standard Grant
Glacial-interglacial History of West Antarctic Nunataks and Site Reconnaissance for Subglacial Bedrock Sampling
西南极努纳塔克群岛的冰期-间冰期历史和冰下基岩采样现场勘察
- 批准号:
1142162 - 财政年份:2012
- 资助金额:
$ 37.68万 - 项目类别:
Standard Grant
Collaborative Research: Constraints on the last Ross Ice Sheet from Glacial Deposits in the Southern Transantarctic Mountains
合作研究:南横贯南极山脉冰川沉积物对最后一个罗斯冰盖的限制
- 批准号:
0838818 - 财政年份:2009
- 资助金额:
$ 37.68万 - 项目类别:
Standard Grant
Collaborative Research:Grounding-line Retreat in the Southern Ross Sea - Constraints from Scott Glacier
合作研究:南罗斯海接地线后退——斯科特冰川的限制
- 批准号:
0636818 - 财政年份:2007
- 资助金额:
$ 37.68万 - 项目类别:
Continuing Grant
Collaborative Research: An Absolute Chronology of the Southernmost Advances of the Laurentide Ice Sheet
合作研究:劳伦太德冰盖最南端进展的绝对年代学
- 批准号:
0545518 - 财政年份:2006
- 资助金额:
$ 37.68万 - 项目类别:
Continuing Grant
Collaborative Research: A Proposal for the CosmicRay prOduced NUclide Systematics on Earth (CRONUS-Earth) Project
合作研究:CosmicRay 地球核素系统学 (CRONUS-Earth) 项目的提案
- 批准号:
0345574 - 财政年份:2005
- 资助金额:
$ 37.68万 - 项目类别:
Continuing Grant
Collaborative Research: Chronology of Ice Fluctuations in the South Shetland Islands Since the Last Glacial Maximum
合作研究:自末次盛冰期以来南设得兰群岛冰涨落的年代学
- 批准号:
0338141 - 财政年份:2004
- 资助金额:
$ 37.68万 - 项目类别:
Standard Grant
Deglaciation of the Marble Hills, Southern Ellsworth Mountains
南埃尔斯沃斯山脉大理石山冰川消融
- 批准号:
0230198 - 财政年份:2003
- 资助金额:
$ 37.68万 - 项目类别:
Standard Grant
相似海外基金
Collaborative Research: Testing the Linchpin of WAIS Collapse with Diatoms and IRD in Pleistocene and Late Pliocene Strata of the Resolution Drift, Amundsen Sea, Antarctica
合作研究:用硅藻和 IRD 测试南极洲阿蒙森海分辨率漂移的更新世和上新世晚期地层中 WAIS 塌陷的关键
- 批准号:
1939146 - 财政年份:2020
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Collaborative Research: Testing the Linchpin of WAIS Collapse with Diatoms and IRD in Pleistocene and Late Pliocene Strata of the Resolution Drift, Amundsen Sea, Antarctica
合作研究:用硅藻和 IRD 测试南极洲阿蒙森海分辨率漂移的更新世和上新世晚期地层中 WAIS 塌陷的关键
- 批准号:
1939139 - 财政年份:2020
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WAIS Workshops 2019-2021: An Annual Transdisciplinary Forum for Studies of the West Antarctic Ice Sheet by the next Generation of Polar Scientists
WAIS 研讨会 2019-2021:下一代极地科学家研究南极西部冰盖的年度跨学科论坛
- 批准号:
1931253 - 财政年份:2019
- 资助金额:
$ 37.68万 - 项目类别:
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Collaborative Research: Synchronizing the WAIS Divide and Greenland Ice Cores from 30-65 ka BP Using High-resolution 10Be Measurements
合作研究:使用高分辨率 10Be 测量同步 WAIS 分水岭和格陵兰冰芯 30-65 ka BP
- 批准号:
1644094 - 财政年份:2017
- 资助金额:
$ 37.68万 - 项目类别:
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Collaborative Research: Synchronizing the WAIS Divide and Greenland Ice Cores from 30-65 ka BP Using High-resolution 10Be Measurements
合作研究:使用高分辨率 10Be 测量同步 WAIS 分水岭和格陵兰冰芯 30-65 ka BP
- 批准号:
1644128 - 财政年份:2017
- 资助金额:
$ 37.68万 - 项目类别:
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West Antarctic Ice Sheet (WAIS) Workshops 2017-2018 - A Forum for WAIS Research and the Thwaites Program
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- 批准号:
1744540 - 财政年份:2017
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完成 WAIS Divide Ice Core CO2 记录
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1246465 - 财政年份:2013
- 资助金额:
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Collaborative Research: VeLveT Ice - eVoLution of Fabric and Texture in Ice at WAIS Divide, West Antarctica
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