The nature and timing of deglaciation and landscape response to abrupt climate change

冰川消融的性质和时间以及对气候突变的景观响应

• 批准号: 2705373
• 金额: --
• 依托单位: Royal Holloway University of London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2705373
• 关键词: nature; timing; deglaciation; landscape; response

Glacier-fed drainage basins cover ~26% of global land surface populated by nearly one third of global population. Predicted increases in global temperatures means that understanding the potential patterns and rates of future glacier melt is a key concern. Critical information to understand rates of melt can be extracted from reconstructions of past ice masses with this project focusing on the Last Glacial Interglacial Transition (LGIT; 19 - 8 kyr BP). Reconstructions of the former British and Irish Ice Sheet have concentrated on the timing and rates of ice retreat from offshore maxima to the present-day coastline to understand deglaciation in marine terminating glaciers. However, the reconstructions have low precision (millennial scale) and do not deal with the timing of terrestrial ice retreat. Therefore, there is a need to extend our understanding of this deglaciation in both a spatial and temporal sense, particularly by developing human lifetime relevant (sub-centennial scale) reconstructions of ice retreat. This project will aim to develop robust, precise and accurate chronologies of the deglaciation of Northern Britain during the LGIT using multiple chronological tools from 3 strategically located sites. It will assess the rate of landscape response to abrupt climate change by using sedimentary ancient DNA and XRF as high resolution palaeoclimatic and palaeoenvironmental proxy data.

冰川滋养的流域覆盖了全球约 26% 的陆地表面，居住着全球近三分之一的人口。预计全球气温将上升，这意味着了解未来冰川融化的潜在模式和速度是一个关键问题。通过该项目重点关注末次冰期间冰期转变（LGIT；19 - 8 kyr BP），可以从过去冰块的重建中提取了解融化速率的关键信息。前英国和爱尔兰冰盖的重建集中于冰从近海最大值退缩到当今海岸线的时间和速率，以了解海洋终止冰川的消融作用。然而，重建精度较低（千年尺度），并且没有处理陆地冰退缩的时间。因此，有必要在空间和时间意义上扩展我们对这种冰消作用的理解，特别是通过开发与人类一生相关（亚百年尺度）的冰消退重建。该项目旨在利用来自 3 个战略地点的多种年代工具，制定 LGIT 期间英国北部冰消期的稳健、精确和准确的年表。它将利用沉积古 DNA 和 XRF 作为高分辨率古气候和古环境代理数据来评估景观对突然气候变化的响应率。