The state and fate of mountain permafrost and implications for debris supply in glacierised catchments

山区永久冻土的状况和命运以及对冰川流域碎片供应的影响

• 批准号: 2743519
• 金额: --
• 依托单位: Northumbria University
• 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-2743519
• 关键词: state; fate; mountain; permafrost; implications

Climate warming is pronounced is many mountainous regions, which is causing degradation of high altitude permafrost. In turn, permafrost degradation reduces slope stability, with implications for the magnitude and frequency of mass movements which can pose a hazard to life and play a key role in landscape evolution, particularly of the mountain cryosphere. Global permafrost zonation models provide a spatially extensive overview of the state of permafrost for a given reference period and can inform more detailed regional- and local-scale analysis, e.g. for providing broad-scale cryospheric context for mass movement inventories. Catchment-scale analysis using satellite- and ground-based observation and analysis can provide additional granularity which is key for developing a detailed understanding of cryospheric state, exploring links to geomorphic processes, and for informing catchment management plans (both from water resources and hazard management perspectives).The objectives of this project are:1 To update an existing global permafrost zonation model using climate reanalysis data and to simulate future permafrost zonation using Representative Concentration Pathway (RCP) trajectories;2 Use a land surface model to obtain higher spatiotemporal resolution estimates of permafrost degradation in select glacierised catchments (includes fieldwork component).3 Explore the implications of permafrost degradation and other preparatory and triggering factors for the continuous (e.g. small rockfalls) or episodic (e.g. rock avalanches) delivery of debris to glacierised catchments.

许多山区气候变暖十分明显，导致高海拔永久冻土退化。反过来，永久冻土退化会降低边坡稳定性，从而影响质量运动的幅度和频率，这可能对生命造成危害，并在景观演变中发挥关键作用，特别是山区冰冻圈。全球永久冻土区带模型提供了给定参考时期永久冻土状态的空间广泛概述，并且可以为更详细的区域和地方尺度分析提供信息，例如为大规模运动清单提供大范围的冰冻圈背景。使用卫星和地面观测和分析进行流域规模分析可以提供额外的粒度，这对于详细了解冰冻圈状态、探索与地貌过程的联系以及为流域管理计划（包括水资源和灾害管理）提供信息至关重要该项目的目标是：1 使用气候再分析数据更新现有的全球永久冻土带模型，并使用代表性浓度路径 (RCP) 模拟未来的永久冻土带。轨迹；2 使用地表模型获得选定冰川流域永久冻土退化的更高时空分辨率估计（包括实地工作部分）。3 探索永久冻土退化和其他准备和触发因素对连续（例如小型落石）或间歇性的影响（例如岩崩）将碎片运送到冰川流域。