Collaborative Research: The Lake Superior Basin: Natural Geomorphic Experiment, Deepwater-Terminating Ice Stream, and Isostatically Adjusting Rift

合作研究:苏必利尔湖盆地:自然地貌实验、深水终止冰流和均衡调整裂谷

基本信息

  • 批准号:
    2218460
  • 负责人:
  • 金额:
    $ 21.72万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2022
  • 资助国家:
    美国
  • 起止时间:
    2022-08-15 至 2027-07-31
  • 项目状态:
    未结题

项目摘要

Glaciers, lakes, rivers, and the solid Earth interact to reshape the surface environment. This applies to the Lake Superior Basin, a basin that formed as a rift in Earth's crust 1.1 billion years ago and since has hosted mountains, lakes, glaciers, rivers, and human inhabitants. Past and present lake-level change is responding to ancient ice-sheet retreat, whose unweighting of Earth's surface causes our planet's crust to bend and underlying mantle to flow. This project takes a multidisplinary approach to better understand the shaping of this continental landscape. The research team is reconstructing how the geological past of the Lake Superior basin impacts ongoing uplift and tilting of the land surface as well as surface processes including river erosion. Lake-level fall incites rivers to slice downwards through sediment and rock, while lake-level rise drowns the river mouths, causing deposition of gravel and sand. Mapping the three-dimensional patterns of the rivers encompassing the Lake Superior Basin, as they cut through materials ranging from soft mud to hard rock, is critical for understanding erosional processes. Additionally, dating landforms associated with past water-terminating glaciers and simulating their dynamics using computer models will improve scientists' ability to predict the fate of Earth’s existing ice sheets. Indigenous Ojibwe partners will consult in the research and share knowledge of both land and lake. Through a partnership with the Superior Hiking Trail Association, the project team will enhance outdoor recreation by providing public scientific knowledge of the region and its natural history. Finally, the research team is self-examining its approaches and practices to learn how to better include and support upcoming generations of Earth scientists.Through the nexus of the Lake Superior basin, this research is answering fundamental questions about river incision, (de)glacial landscape and lake-scape evolution, water-terminating glacier instabilities, and glacial isostatic adjustment. Lake Superior provides a uniquely suited testbed to advance each of these knowledge areas and to understand their feedbacks. Synchronous base-level fall on Lake Superior triggered river incision and knickpoint propagation across myriad lithologies, providing replicate natural experiments in erosional mechanics. The project team is applying traditional glacial geological approaches together with state-of-the-art topographic analyses to map lake-level evolution and the extent of glacial and fluvial process domains. Paleolake shorelines and spillways were modified by, and record, glacial isostatic adjustment, which can be further constrained via detailed seismic imaging of three-dimensional solid-Earth structure and extensive modern global navigation satellite system data. These data are being used to probe deeply into the mechanisms and feedbacks surrounding the marine ice sheet instability, critical for understanding the response and sensitivity of marine-terminating outlet glaciers and ice sheets. The research team is partnering with local nonprofit and government organizations to share the narrative of the Lake Superior region, integrate Indigenous knowledge, and build an inclusive field-research program whose goal is to invite a diversifying next generation into the geosciencesThis 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.
冰川、湖泊、河流和固体地球相互作用,重塑了地表环境。这适用于苏必利尔湖盆地,这个盆地是11亿年前在地壳上形成的一个裂口,从那以后就有了山脉、湖泊、冰川、河流和人类居民。过去和现在的湖泊水位变化是对古代冰盖退缩的反应,冰盖对地球表面的减轻导致我们的地壳弯曲,下面的地幔流动。该项目采用多学科的方法来更好地理解这片大陆景观的形成。研究小组正在重建苏必利尔湖盆地的地质历史如何影响地表的持续隆起和倾斜,以及包括河流侵蚀在内的地表过程。水位下降刺激河流向下切割沉积物和岩石,而水位上升淹没河口,造成砾石和沙子的沉积。绘制苏必利尔湖盆地周围河流的三维模式,因为它们穿过从软泥到硬岩石的各种材料,对于理解侵蚀过程至关重要。此外,测定与过去止水冰川有关的地貌的年代,并利用计算机模型模拟它们的动态,将提高科学家预测地球现有冰盖命运的能力。土著Ojibwe合作伙伴将在研究中提供咨询,并分享有关土地和湖泊的知识。通过与Superior远足径协会的合作,项目团队将通过向公众提供该地区及其自然历史的科学知识来增加户外娱乐活动。最后,研究小组正在自我检查其方法和实践,以学习如何更好地包括和支持即将到来的几代地球科学家。通过苏必利尔湖流域的联系,本研究回答了关于河流切割、(冰川)景观和湖泊景观演变、水终止冰川不稳定性和冰川均衡调整等基本问题。苏必利尔湖提供了一个独特的适合的测试平台来推进这些知识领域,并了解他们的反馈。苏必利尔湖的同步基准面下降触发了河流切口和裂缝点在无数岩性上的传播,为侵蚀力学提供了复制的自然实验。项目小组将传统的冰川地质方法与最先进的地形分析相结合,绘制湖泊水位演变图以及冰川和河流过程域的范围。冰川均衡调整改变并记录了古湖泊岸线和溢洪道,详细的三维固体地球结构地震成像和广泛的现代全球导航卫星系统数据可以进一步约束古湖泊岸线和溢洪道。这些数据被用于深入探讨海洋冰盖不稳定性的机制和反馈,这对于理解海洋终端出口冰川和冰盖的响应和敏感性至关重要。研究团队正在与当地的非营利组织和政府组织合作,分享苏必利尔湖地区的故事,整合土著知识,并建立一个包容性的实地研究项目,其目标是邀请多元化的下一代进入地球科学领域。该奖项反映了美国国家科学基金会的法定使命,并通过使用基金会的知识价值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

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Jerry Mitrovica其他文献

Jerry Mitrovica的其他文献

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{{ truncateString('Jerry Mitrovica', 18)}}的其他基金

Collaborative Research: P2C2--Constraints on Last Interglacial and Late Holocene Global Mean Sea Level and Fingerprinting Polar Ice Mass Flux from Broadly Distributed Coastal Caves
合作研究:P2C2——对末次间冰期和晚全新世全球平均海平面的约束以及广泛分布的沿海洞穴的极地冰质量通量指纹识别
  • 批准号:
    2202698
  • 财政年份:
    2022
  • 资助金额:
    $ 21.72万
  • 项目类别:
    Standard Grant
Collaborative Research: Imaging the 3D Viscosity Structure of the Antarctic Mantle with Existing Observations from GPS and Relative Sea Level
合作研究:利用 GPS 和相对海平面的现有观测结果对南极地幔的 3D 粘度结构进行成像
  • 批准号:
    2142593
  • 财政年份:
    2022
  • 资助金额:
    $ 21.72万
  • 项目类别:
    Standard Grant
Collaborative Research: Constraining West Antarctic Ice Sheet Elevation during the last Interglacial
合作研究:限制末次间冰期期间南极西部冰盖的海拔
  • 批准号:
    1744927
  • 财政年份:
    2018
  • 资助金额:
    $ 21.72万
  • 项目类别:
    Continuing Grant
Collaborative Research: P2C2 - Reconstructing rates and sources of sea-level change over the last ~150 thousand years from a new coral database
合作研究:P2C2 - 从新的珊瑚数据库重建过去约 15 万年海平面变化的速率和来源
  • 批准号:
    1702684
  • 财政年份:
    2017
  • 资助金额:
    $ 21.72万
  • 项目类别:
    Standard Grant
CSEDI Collaborative Research: Anelastic properties of the Earth from seismic to tidal timescale
CSEDI 合作研究:从地震到潮汐时间尺度的地球滞弹性特性
  • 批准号:
    1464033
  • 财政年份:
    2015
  • 资助金额:
    $ 21.72万
  • 项目类别:
    Continuing Grant
Collaborative research: Sea-level variability during the Common Era
合作研究:公元元年海平面变化
  • 批准号:
    1458907
  • 财政年份:
    2015
  • 资助金额:
    $ 21.72万
  • 项目类别:
    Standard Grant
Collaborative research: Sea-level responses to sediment erosion and deposition over the past 3 million years
合作研究:过去 300 万年海平面对沉积物侵蚀和沉积的响应
  • 批准号:
    1527351
  • 财政年份:
    2015
  • 资助金额:
    $ 21.72万
  • 项目类别:
    Continuing Grant
Collaborative Research: The impact of time-dependent mantle rheology and 3-D structure on models and observations of Glacial Isostatic Adjustment
合作研究:随时间变化的地幔流变学和三维结构对冰川均衡调整模型和观测的影响
  • 批准号:
    1315368
  • 财政年份:
    2013
  • 资助金额:
    $ 21.72万
  • 项目类别:
    Continuing Grant
Studies of Mantle Dynamics and Evolution
地幔动力学和演化研究
  • 批准号:
    1215061
  • 财政年份:
    2012
  • 资助金额:
    $ 21.72万
  • 项目类别:
    Continuing Grant
Collaborative Research: P2C2 -- Statistical estimation of past ice sheet volumes from paleo-sea level records
合作研究:P2C2——根据古海平面记录对过去冰盖体积的统计估计
  • 批准号:
    1203414
  • 财政年份:
    2012
  • 资助金额:
    $ 21.72万
  • 项目类别:
    Standard Grant

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Collaborative Research: Holocene biogeochemical evolution of Earth's largest lake system
合作研究:地球最大湖泊系统的全新世生物地球化学演化
  • 批准号:
    2336132
  • 财政年份:
    2024
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Collaborative Research: Connecting the Past, Present, and Future Climate of the Lake Victoria Basin using High-Resolution Coupled Modeling
合作研究:使用高分辨率耦合建模连接维多利亚湖盆地的过去、现在和未来气候
  • 批准号:
    2323649
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    2024
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    $ 21.72万
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Collaborative Research: Connecting the Past, Present, and Future Climate of the Lake Victoria Basin using High-Resolution Coupled Modeling
合作研究:使用高分辨率耦合建模连接维多利亚湖盆地的过去、现在和未来气候
  • 批准号:
    2323648
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Collaborative Research: Holocene biogeochemical evolution of Earth's largest lake system
合作研究:地球最大湖泊系统的全新世生物地球化学演化
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