Source-to-sink dynamics and palaeo-environment reconstruction from a dynamically evolving glacial foreland

动态演化的冰川前陆的源-汇动态和古环境重建

• 批准号: 2440300
• 金额: --
• 依托单位: Queen's University Belfast
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2440300
• 关键词: Source; sink; dynamics; palaeo; environment

"The pathways of glacial meltwater, from surface ablation through to proglacial discharge, are a key component in understanding the role of hydrology and its influence on glacier dynamics. The trajectory and volume of this meltwater can have both long- and short-term impacts on ice velocity, which in turn play an important role in glacier mass balance regimes. This project will investigate the Breidameryokull ('Breida") glacier and its foreland in Iceland. This is a glacier that is currently experiencing rapid ice margin retreat that is well-captured in satellite records. This provides an excellent opportunity for documenting how subglacial meltwater systems transition into proglacial systems and what processes dominate during this evolution. In this project the student will be exposed to a suite of geological and geophysical methods to understand how the glacier has evolved in the past and what relevance this might have to understanding ongoing and future environmental changes. Sedimentary cores collected from a proglacial lake at Breida will be utilised in unison with the mapping of landform records that will be integrated with repeated ground-penetrating radar surveys that will be calibrated against sedimentological records. Combining these methods and considering the source-to-sink dynamics of the glacial system will provide the student with a holistic understanding of environmental changes in the study area, with the potential to upscale this understanding to other ice masses currently experiencing increases in surface meltwater production, such as analogous outlet glaciers in Greenland. This record will allow a comparison between historical and contemporary changes. These changes can be considered together to refine our understanding of different glaciological and geomorphological processes that evolve during ice margin retreat as well as the impact of an adjacent tidally-influenced water body. Such observations are crucial for helping to calibrate and test numerical Earth-system models that seek to project the implications of future environmental change in glacierised settings brought about by rising global air and ocean temperatures.The project will provide training opportunities in sediment analysis, geophysics and remote sensing applied to an accessible location. Interest in glacial processes with regard to climate change has never been greater, such that this work will have high research impact applicable to the study location and beyond."

“从表面消融到冰河排放，冰川融化的途径是理解水文学作用及其对冰川动力学的影响的关键组成部分。这种融化水的轨迹和体积长期和短期对冰速度的影响和短期对冰速度都可以在Glacier质量方面起着重要作用。冰岛的前陆。这是一个冰川，目前正在经历卫星记录中广受欢迎的快速冰缘静修处。这为记录了冰川融化系统如何过渡到冰期系统以及在此演变过程中占主导地位的哪些过程是如何过渡的。在这个项目中，学生将接触一套地质和地球物理方法，以了解冰川过去如何发展，以及这可能与理解正在进行和未来的环境变化的相关性。从布雷达（Breida）的前冰湖中收集的沉积核心将与地图记录的映射一起使用，这些记录将与重复的地面雷达雷达调查集成在一起，这些雷达雷达调查将对沉积学记录进行校准。结合这些方法并考虑冰川系统的源头动力学，将为学生提供对研究区域环境变化的全面了解，并有可能使这种理解对当前经历的其他冰块的理解提高到目前经历的冰质量，例如格陵兰岛的类似的出口冰川。该记录将允许历史变化和当代变化之间进行比较。可以考虑这些变化，以完善我们对在冰缘撤退期间进化的不同冰川学和地貌过程的理解，以及相邻潮湿影响的水体的影响。此类观察对于帮助校准和测试数值地球系统模型至关重要，这些模型旨在投影通过升高的全球空气和海洋温度带来的冰川环境中未来环境变化的含义。该项目将在沉积物分析，地球物理学以及应用于可访问的位置中提供培训机会。对冰川过程对气候变化的兴趣从未如此大，因此这项工作将对研究地点及以后的研究产生巨大的研究影响。”