Collaborative Research: Multidisciplinary Analysis of Antarctic Blue Ice Moraine Formation and their Potential as Climate Archives over Multiple Glacial Cycles

合作研究：南极蓝冰碛形成及其作为多个冰川周期气候档案的潜力的多学科分析

• 批准号: 1443433
• 负责人: Kathy Licht
• 金额: $ 25.17万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-01 至 2020-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1443433&HistoricalAwards=false
• 关键词: Collaborative; Research; Multidisciplinary; Analysis; Antarctic

Licht/1443433Sediments deposited by the Antarctic ice sheet are an archive of its history with time and help geologists to determine how the remote interior of the ice sheet has changed over the past several hundred thousand years. This project will focus on the formation and dynamics of moraines (accumulations of dirt and rocks that are incorporated in the glacier surface or have been pushed along by the glacier as it moves) near the blue ice area of Mt. Achernar in the central Transantarctic Mountains in Antarctica.. The study will improve basic understanding of the formation of these moraines. Fieldwork at the site will focus on imaging the internal structure of the moraine to determine the processes by which it, and others like it, form over time. Additional analyses will include measurements of ice flow and collection of rock samples to determine the timing of debris deposition and the changes in the sources of sediments from deep within the Antarctic continent. The project will provide both graduate and undergraduate students training in paleoclimate studies, geology, and numerical modeling approaches. The broader impacts of the proposed work include hands on training in the Earth Sciences for graduate and undergraduate students, collaboration with colleagues in New Zealand and Sweden to provide an international research experience for students from the US, and three educational modules to be delivered by student researchers regarding Antarctica's role in global environments. The research is societally relevant and multidisciplinary and the topics are ideal for sharing with the public. All research findings will be made publicly available to others via timely publication in high-impact, peer-reviewed journals and all data will be submitted to the National Snow and Ice Data Center, and excess samples will be provided to the U.S. Polar Rock Repository.Direct observations of ice sheet history from the margins of Antarctica's polar plateau are essential for testing numerical ice sheet models, and the laterally extensive, blue-ice moraines of the Mt. Achernar Moraine complex in the central Transantarctic Mountains contain a unique and nearly untapped direct, quasi-continuous record of ice sheet change over multiple glacial cycles. The project objectives include improved understanding of processes and rates of blue ice moraine formation, as well as identifying the topographic, glaciological, and climatic controls on their evolution. Data to be collected with fieldwork in Antarctica include: imaging of internal ice structure with ground-penetrating radar, measurement of ice flow velocity and direction with a global positioning system (GPS) array, analysis of debris concentration and composition in glacier ice, state-of-the-art cosmogenic multi-nuclide analyses to determine exposure ages of moraine debris, mapping of trimlines and provenance analysis. Numerical model simulations, constrained by field data, will be used to evaluate the factors influencing changes in glacier flow that potentially impact the accumulation of the moraine debris. All together, the new data and modeling efforts will improve conceptual models of blue ice moraine formation, and thereby make them a more valuable proxy for developing a better understanding of the history of the ice sheet.

由南极冰盖沉积的LICHT/1443433SEDIMENT是其历史的档案，并帮助地质学家确定冰盖的偏远内部在过去几十万年内如何变化。 该项目将着重于冰ora的形成和动力学（在冰川表面掺入的泥土和岩石的积累​​，或者在冰川移动时已将其推动），附近是南方中部中部跨北极山脉山的蓝冰区域。该站点的现场工作将集中于成像冰ora的内部结构，以确定随着时间的推移形成的过程以及其他类似的过程。 其他分析将包括测量冰流和岩石样品的收集，以确定碎屑沉积的时机以及来自南极大陆深处沉积物来源的变化。该项目将提供研究生和本科生在古气候研究，地质和数值建模方法方面的培训。拟议工作的更广泛的影响包括在地球科学中为研究生和本科生培训，与新西兰和瑞典的同事合作，为来自美国的学生提供国际研究经验，以及学生研究人员就南极洲在全球环境中的作用提供三个教育模块。该研究具有社会相关性和多学科，主题是与公众共享的理想选择。 All research findings will be made publicly available to others via timely publication in high-impact, peer-reviewed journals and all data will be submitted to the National Snow and Ice Data Center, and excess samples will be provided to the U.S. Polar Rock Repository.Direct observations of ice sheet history from the margins of Antarctica's polar plateau are essential for testing numerical ice sheet models, and the laterally extensive, blue-ice moraines of the中央横向山脉中的Achernar Moraine配合物在多个冰川循环上发生了独特且几乎没有开发的直接，准确的冰盖变化记录。 项目目标包括对蓝冰形成的过程和速率的提高理解，以及在其演变上识别地形，冰川学和气候控制。 Data to be collected with fieldwork in Antarctica include: imaging of internal ice structure with ground-penetrating radar, measurement of ice flow velocity and direction with a global positioning system (GPS) array, analysis of debris concentration and composition in glacier ice, state-of-the-art cosmogenic multi-nuclide analyses to determine exposure ages of moraine debris, mapping of trimlines and provenance analysis. 受现场数据约束的数值模型模拟将用于评估影响冰川流动变化的因素，从而可能影响冰ora碎片的积累。 总的来说，新的数据和建模工作将改善蓝冰冰ora形成的概念模型，从而使它们成为更好地理解冰盖历史的更有价值的代理。

项目成果

Formation and evolution of an extensive blue ice moraine in central Transantarctic Mountains, Antarctica

南极洲中部横贯南极山脉广泛的蓝色冰碛的形成和演化

• DOI: 10.1017/jog.2019.83
• 发表时间: 2020
• 期刊: Journal of Glaciology
• 影响因子: 3.4
• 作者: Kassab, Christine M.;Licht, Kathy J.;Petersson, Rickard;Lindbäck, Katrin;Graly, Joseph A.;Kaplan, Michael R.
• 通讯作者: Kaplan, Michael R.

Chemical weathering signatures from Mt. Achernar Moraine, Central Transantarctic Mountains I: Subglacial sediments compared with underlying rock

• DOI: 10.1016/j.gca.2020.06.005
• 发表时间: 2020-08
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: J. Graly;K. Licht;N. Bader;D. Bish

Warm-based basal sediment entrainment and far-field Pleistocene origin evidenced in central Transantarctic blue ice through stable isotopes and internal structures

通过稳定同位素和内部结构在跨南极蓝冰中部证实了暖基基底沉积物夹带和远场更新世起源

• DOI: 10.1017/jog.2018.4
• 发表时间: 2018
• 期刊: Journal of Glaciology
• 影响因子: 3.4
• 作者: GRALY, JOSEPH A.;LICHT, KATHY J.;KASSAB, CHRISTINE M.;BIRD, BROXTON W.;KAPLAN, MICHAEL R.
• 通讯作者: KAPLAN, MICHAEL R.

Polar desert chronologies through quantitative measurements of salt accumulation

通过定量测量盐积累来确定极地沙漠年表

• DOI: 10.1130/g39650.1
• 发表时间: 2018
• 期刊: Geology
• 影响因子: 5.8
• 作者: Graly, Joseph A.;Licht, Kathy J.;Druschel, Gregory K.;Kaplan, Michael R.
• 通讯作者: Kaplan, Michael R.