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.

气候变暖在许多山区是明显的，这是造成高海拔多年冻土退化。永久冻土退化反过来又降低了斜坡的稳定性，影响到质量运动的幅度和频率，这可能对生命构成危险，并在景观演变中发挥关键作用，特别是山区冰冻圈。全球冻土带模型提供了一个给定参考期内冻土状态的空间广泛概览，并可为更详细的区域和地方尺度分析提供信息，例如为物质运动清单提供大尺度冰冻圈背景。利用卫星和地面观测和分析进行的流域尺度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提供信息至关重要（从水资源和灾害管理的角度）。1利用气候再分析数据更新现有的全球冻土带模型，并利用代表性的浓度路径（RCP）的轨迹;2使用陆地表面模型，以获得更高的时空分辨率的估计永久冻土退化在选定的冰川流域（包括实地考察的组成部分）。3探讨永久冻土退化和其他准备和触发因素的影响，连续（如小落石）或偶发（如岩石雪崩）交付碎片冰川流域。