Collaborative Research: Investigating Ice Sheet - Solid Earth Feedbacks in West Antarctica: Implications for Ice Sheet Evolution and Stability

合作研究:调查冰盖 - 南极洲西部的固体地球反馈:对冰盖演化和稳定性的影响

基本信息

  • 批准号:
    1744852
  • 负责人:
  • 金额:
    $ 18.19万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2018
  • 资助国家:
    美国
  • 起止时间:
    2018-09-15 至 2024-08-31
  • 项目状态:
    已结题

项目摘要

The earth's surface in West Antarctica is rising at extremely high rates in response to unloading of ice sheet mass. This research (1) improves the spatial coverage and accuracy of measurements of surface uplift using the Global Positioning System (GPS) and (2) probes the structure of the deep earth using seismology. These observations will be integrated into a state-of-the-art, 3-D ice sheet model to simulate the past and future behavior of the West Antarctic Ice Sheet and assess its vulnerability. Project results will allow assessment of the West Antarctic Ice Sheet's rate of change and the time frame for its accelerating contribution to global sea-level rise, which is predicted to have an amplified impact for U.S. coastlines. This research program builds on and leverages prior investments in autonomous observational infrastructure through technological advances and international partnerships. Archived open-access data from the project will facilitate a range of studies that will advance basic knowledge of the Antarctic continent and its ice sheet cover. The project will train and mentor an interdisciplinary cohort of polar scientists through field work, workshops, and a summer school leveraged by an online resource library. The POLENET-ANET autonomous GPS and seismic network will be reconfigured to acquire higher-resolution in situ data focused around the Amundsen Embayment to capture spatially varying crustal motions and Earth structure in a region where the ice sheet is rapidly changing. The pattern and scale of lateral variations in mantle temperature, viscosity, and lithospheric elastic thickness at the resolution necessary to characterize this system will be established from seismological studies incorporating the new instrumentation footprint. Absolute mantle viscosity values will be independently determined using crustal motion data from high-precision GPS time series together with West Antarctic Ice Sheet (WAIS) surface mass balance and ice history information. Where mantle viscosity varies over short spatial scales and bedrock topography below the ice sheet is complex, as is hypothesized for West Antarctica, both positive and negative feedbacks between the ice sheet and the solid earth may occur, acting to stabilize or destabilize ice dynamics by raising or lowering the grounding line and reducing or increasing retrograde bed slopes below major outlet glaciers. New constraints on 3-D Earth structure will be built into innovative 3-D glacial isostatic adjustment (GIA) models and coupled models of climate-cryosphere-solid Earth systems. These advanced models, constrained by the new observations obtained in this project, will simulate the past and future evolution of the WAIS to improve estimates of changing ice mass in West Antarctica, establish where the WAIS may be stabilized by ongoing Earth deformation, and reduce uncertainties in projections of future sea level change.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.
南极洲西部的地球表面正在以极高的速度上升,以回应冰盖质量的卸荷。这项研究(1)提高了利用全球定位系统(GPS)测量地表隆起的空间覆盖率和精度;(2)利用地震学探索了地球深部的结构。这些观测将被整合到最先进的3-D冰盖模型中,以模拟西南极冰盖过去和未来的行为,并评估其脆弱性。项目成果将有助于评估西南极冰盖的变化速度,以及其对全球海平面上升的加速贡献的时间框架,预计这将对美国海岸线产生放大的影响。这一研究计划建立在自主观测基础设施的先前投资的基础上,并通过技术进步和国际合作伙伴关系加以利用。该项目存档的开放获取数据将促进一系列研究,促进对南极大陆及其冰盖的基本知识。该项目将通过实地工作、讲习班和在线资源库利用的暑期学校,培训和指导一批跨学科的极地科学家。POLENET-ANET自主GPS和地震网络将重新配置,以获取围绕阿蒙森湾的更高分辨率的现场数据,以捕获冰盖迅速变化的地区在空间上变化的地壳运动和地球结构。地幔温度、粘度和岩石圈弹性厚度横向变化的模式和尺度将通过纳入新仪器足迹的地震学研究来确定,这是描述该系统所需的分辨率。利用来自高精度GPS时间序列的地壳运动数据,结合西南极冰盖(WAIS)表面物质平衡和冰历史信息,将独立确定地幔绝对粘性值。在地幔粘度在短空间尺度上变化的情况下,如果冰盖下的基岩地形复杂,如西南极假设的那样,冰盖和固体地球之间可能会发生正反馈和负反馈,通过升高或降低接地线以及减少或增加主要出口冰川下方的逆行床坡来稳定或破坏冰的动力学。对三维地球结构的新约束将被构建到创新的三维冰川均衡调整(GIA)模型和气候-冰冻圈-固体地球系统的耦合模型中。这些先进的模型,受本项目中获得的新观测结果的限制,将模拟WAIS过去和未来的演变,以改进对南极洲西部冰块变化的估计,确定WAIS可能会因持续的地球变形而稳定在哪里,并减少未来海平面变化预测的不确定性。该奖项反映了NSF的法定使命,并通过使用基金会的智力优势和更广泛的影响审查标准进行评估,被认为值得支持。

项目成果

期刊论文数量(13)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Seismicity and Pn Velocity Structure of Central West Antarctica
南极洲中西部的地震活动和 Pn 速度结构
  • DOI:
    10.1029/2020gc009471
  • 发表时间:
    2021
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Lucas, Erica M.;Nyblade, Andrew A.;Lloyd, Andrew J.;Aster, Richard C.;Wiens, Douglas A.;O'Donnell, John Paul;Stuart, Graham W.;Wilson, Terry J.;Dalziel, Ian W. D.;Winberry, J. Paul
  • 通讯作者:
    Winberry, J. Paul
P- and S-wave velocity structure of central West Antarctica: Implications for the tectonic evolution of the West Antarctic Rift System
西南极洲中部的纵波和横波速度结构:对西南极裂谷系统构造演化的启示
  • DOI:
    10.1016/j.epsl.2020.116437
  • 发表时间:
    2020
  • 期刊:
  • 影响因子:
    5.3
  • 作者:
    Lucas, Erica M.;Soto, David;Nyblade, Andrew A.;Lloyd, Andrew J.;Aster, Richard C.;Wiens, Douglas A.;O'Donnell, John Paul;Stuart, Graham W.;Wilson, Terry J.;Dalziel, Ian W.
  • 通讯作者:
    Dalziel, Ian W.
Heterogeneous upper mantle structure beneath the Ross Sea Embayment and Marie Byrd Land, West Antarctica, revealed by P-wave tomography
  • DOI:
    10.1016/j.epsl.2019.02.013
  • 发表时间:
    2019-05
  • 期刊:
  • 影响因子:
    5.3
  • 作者:
    A. White-Gaynor;A. Nyblade;R. Aster;D. Wiens;P. Bromirski;P. Gerstoft;R. Stephen;S. Hansen;T. Wilson;I. Dalziel;A. Huerta;J. Paul Winberry;S. Anandakrishnan
  • 通讯作者:
    A. White-Gaynor;A. Nyblade;R. Aster;D. Wiens;P. Bromirski;P. Gerstoft;R. Stephen;S. Hansen;T. Wilson;I. Dalziel;A. Huerta;J. Paul Winberry;S. Anandakrishnan
The uppermost mantle seismic velocity structure of West Antarctica from Rayleigh wave tomography: Insights into tectonic structure and geothermal heat flow
  • DOI:
    10.1016/j.epsl.2019.06.024
  • 发表时间:
    2019-09
  • 期刊:
  • 影响因子:
    5.3
  • 作者:
    J. O’Donnell;G. Stuart;A. Brisbourne;K. Selway;Yingjie Yang;G. Nield;P. Whitehouse;A. Nyblade;D. Wiens;R. Aster;S. Anandakrishnan;A. Huerta;T. Wilson;J. P. Winberry
  • 通讯作者:
    J. O’Donnell;G. Stuart;A. Brisbourne;K. Selway;Yingjie Yang;G. Nield;P. Whitehouse;A. Nyblade;D. Wiens;R. Aster;S. Anandakrishnan;A. Huerta;T. Wilson;J. P. Winberry
Mapping Crustal Shear Wave Velocity Structure and Radial Anisotropy Beneath West Antarctica Using Seismic Ambient Noise
  • DOI:
    10.1029/2019gc008459
  • 发表时间:
    2019-11
  • 期刊:
  • 影响因子:
    3.7
  • 作者:
    J. O’Donnell;A. Brisbourne;G. Stuart;C. Dunham;Y. Yang;G. Nield;P. Whitehouse;A. Nyblade;D. Wiens;S. Anandakrishnan;R. Aster;A. Huerta;A. Lloyd;T. Wilson;J. Winberry
  • 通讯作者:
    J. O’Donnell;A. Brisbourne;G. Stuart;C. Dunham;Y. Yang;G. Nield;P. Whitehouse;A. Nyblade;D. Wiens;S. Anandakrishnan;R. Aster;A. Huerta;A. Lloyd;T. Wilson;J. Winberry
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Richard Aster其他文献

Prothrombotic antibodies targeting the spike protein's receptor-binding domain in severe COVID-19
在重症新冠病毒疾病(COVID - 19)中针对刺突蛋白受体结合域的促血栓形成抗体
  • DOI:
    10.1182/blood.2024025010
  • 发表时间:
    2025-02-06
  • 期刊:
  • 影响因子:
    23.100
  • 作者:
    Wen Zhu;Yongwei Zheng;Mei Yu;Nathan Witman;Lu Zhou;Jianhui Wei;Yongguang Zhang;Paytsar Topchyan;Christine Nguyen;David Wang;Rae Janecke;Anand Padmanabhan;Lisa Baumann Kreuziger;Gilbert C. White;Parameswaran Hari;Tongjun Gu;Alexander T. Fields;Lucy Z. Kornblith;Richard Aster;Jieqing Zhu;Renren Wen
  • 通讯作者:
    Renren Wen

Richard Aster的其他文献

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{{ truncateString('Richard Aster', 18)}}的其他基金

Collaborative Research: Understanding the Processes and Timescales of Basalt Petrogenesis and Oceanic Crustal Construction at Slow-Spreading Mid-Ocean Ridges
合作研究:了解缓慢扩张的大洋中脊玄武岩成岩和洋壳构造的过程和时间尺度
  • 批准号:
    2317705
  • 财政年份:
    2023
  • 资助金额:
    $ 18.19万
  • 项目类别:
    Standard Grant
Collaborative Research: The Magmatic and Eruptive System of Mount Erebus Volcano, Antarctica
合作研究:南极洲埃里伯斯火山的岩浆和喷发系统
  • 批准号:
    1916978
  • 财政年份:
    2019
  • 资助金额:
    $ 18.19万
  • 项目类别:
    Standard Grant
Collaborative Research: POLENET-Antarctica: Investigating Links Between Geodynamics and Ice Sheets - Phase 2
合作研究:POLENET-南极洲:调查地球动力学和冰盖之间的联系 - 第二阶段
  • 批准号:
    1419268
  • 财政年份:
    2014
  • 资助金额:
    $ 18.19万
  • 项目类别:
    Continuing Grant
Collaborative Research: POLENET-Antarctica: Investigating Links Between Geodynamics and Ice Sheets - Phase 2
合作研究:POLENET-南极洲:调查地球动力学和冰盖之间的联系 - 第二阶段
  • 批准号:
    1249602
  • 财政年份:
    2013
  • 资助金额:
    $ 18.19万
  • 项目类别:
    Continuing Grant
Collaborative Research: Mantle Structure and Dynamics of the Ross Sea from a Passive Seismic Deployment on the Ross Ice Shelf
合作研究:罗斯冰架上被动地震部署的罗斯海地幔结构和动力学
  • 批准号:
    1141916
  • 财政年份:
    2013
  • 资助金额:
    $ 18.19万
  • 项目类别:
    Standard Grant
Collaborative Research: IPY: POLENET-Antarctica: Investigating Links between Geodynamics and Ice Sheets
合作研究:IPY:POLENET-南极洲:调查地球动力学与冰盖之间的联系
  • 批准号:
    0632185
  • 财政年份:
    2007
  • 资助金额:
    $ 18.19万
  • 项目类别:
    Continuing Grant
Collaborative Research: Colorado Rockies Experiment and Seismic Transects (CREST): Time-space Patterns of Cenozoic Uplift-magmatism and their Correspondence to the Aspen Anomaly
合作研究:科罗拉多落基山脉实验和地震断面(CREST):新生代隆升岩浆作用的时空模式及其与阿斯彭异常的对应
  • 批准号:
    0607693
  • 财政年份:
    2006
  • 资助金额:
    $ 18.19万
  • 项目类别:
    Continuing Grant
Organizational structurefor Rocky Mountain EarthScope: science and education planning
落基山地球范围的组织结构:科学和教育规划
  • 批准号:
    0346036
  • 财政年份:
    2004
  • 资助金额:
    $ 18.19万
  • 项目类别:
    Standard Grant
Colorado Plateau/Rio Grande Rift/Great Plains Seismic Transect
科罗拉多高原/里奥格兰德裂谷/大平原地震断面
  • 批准号:
    0207812
  • 财政年份:
    2002
  • 资助金额:
    $ 18.19万
  • 项目类别:
    Standard Grant

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