Stability of marine basins in the Antarctic Peninsula Ice Sheet from remote sensing

南极半岛冰盖海洋盆地的遥感稳定性

• 批准号: 2890087
• 金额: --
• 依托单位: University of Edinburgh
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2890087
• 关键词: Stability; marine; basins; Antarctic; Peninsula

This project will assess the current and future stability of marine ice-sheet basins that collectively underlie Ellsworth Land, the region that connects the West Antarctic and Antarctic Peninsula Ice Sheets. It is well known that marine ice-sheets basins, defined as the parts of the ice sheets that are grounded below sea level, are particularly vulnerable to retreat and therefore have significant potential to contribute to future global sea-level rise (DeConto and Pollard, 2016; Mercer, 1978), and these processes are much studied in West Antarctica's Amundsen Sea Embayment (Bingham et al., 2017; Scambos et al., 2017). Despite some studies over the last decade also drawing attention to West Antarctica's Ellsworth Land also being vulnerable to marine ice-sheet instability (Bingham et al., 2012) and currently showing signs of this being underway (Hogg et al., 2017; Wouters et al., 2015), the region remains relatively data-poor for good estimates of its future retreat rates and sea-level contributions. Addressing this fundamental knowledge gap and elucidating the dangers to near-future sea-level rise posed by potential retreat of ice from Ellsworth Land form the focus of this project. Aim, objectives and methods of the proposed research The main aim of the project is to assess the near-term (200 years into the future) stability of the Ellsworth Land marine basin lying between West Antarctica and the Antarctic Peninsula. This comprises the following objectives: 1. To compile for Ellsworth Land time series of contemporary glaciological change (changes to ice-surface velocity, surface elevation and the grounding line) from Earth Observation datasets; 2. To track englacial horizons (treated as isochrones, or surfaces of equal age) across Ellsworth Land, and thereby place age constraints on its deep ice, using age constraints from adjacent layer-tracking and links to West Antarctica's ice core age-depth profiles - with the ultimate aim of constraining what is the oldest ice in the region, and hence give clues to its past stability; 3. To explore the application of machine-learning methods for tracking englacial layers in geophysical data and/or compiling time series of contemporary changes from Earth Observation data.

该项目将评估共同位于埃尔斯沃思地下面的海洋冰盖盆地目前和未来的稳定性，埃尔斯沃思地是连接南极西部和南极半岛冰盖的地区。众所周知，海洋冰盖盆地（定义为冰盖在海平面以下的部分）特别容易退缩，因此有可能导致未来全球海平面上升（DeConto和Pollard，2016年;美世，1978年），这些过程在西南极洲的阿蒙森海湾进行了大量研究（Bingham等人，2017; Scambos等人，2017年）。尽管过去十年的一些研究也引起了人们对南极洲西部埃尔斯沃思地的注意，但它也容易受到海洋冰盖不稳定性的影响（Bingham等人，2012）并且目前显示出正在进行的迹象（Hogg等人，2017; Wouters等人，2015年），该地区仍然相对缺乏数据，无法很好地估计其未来的退缩率和海平面的贡献。解决这个基本的知识差距，并阐明从埃尔斯沃思土地冰的潜在撤退所构成的危险，不久的将来海平面上升形成了这个项目的重点。该项目的主要目的是评估位于西南极洲和南极半岛之间的埃尔斯沃思陆地海洋盆地的近期（未来200年）稳定性。这包括以下目标：1.从地球观测数据集中为埃尔斯沃思地编制当代冰川变化（冰面速度，表面高程和接地线的变化）的时间序列; 2。追踪埃尔斯沃思地的内冰层位（被视为等时线，或相等年龄的表面），从而对其深层冰施加年龄限制，使用来自相邻层追踪的年龄限制和与南极洲西部冰芯年龄深度剖面的链接-最终目的是限制该地区最古老的冰，从而提供其过去稳定性的线索; 3.探索应用机器学习方法跟踪地球物理数据中的冰川层和（或）根据地球观测数据汇编当代变化的时间序列。