Monitoring and process analysis of permafrost creep and failure in changing temperature regimes

温度变化情况下永久冻土蠕变和破坏的监测和过程分析

• 批准号: 53470047
• 负责人: Dr. Isabelle Gärtner-Roer
• 金额: --
• 依托单位: Geographisches Institut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/53470047?language=en
• 关键词: Monitoring; process; analysis; permafrost; creep

The aim of this project is the quantification and analysis of process rates in high mountain permafrost regions in order to describe sensitive indicators for climatic changes within the geosystem. Therefore, distinct landforms representing the occurrence of permafrost conditions (such as rockglaciers and frozen talus slopes) are monitored in different regions of the European Alps over a period of several decades by the application of remote sensing and geodetic methods. The resulting kinematics (horizontal and vertical displacements) as well as spatio-temporal variations thereof are considered in terms of rheology. Distinct changes in process rates or landform failures – probably related to permafrost degradation - are analysed in combination with data on surface and subsurface temperatures, internal structures (e.g., ice content, unfrozen water content), rockwall retreat rates as well as simulations from regional scale climate models. The landforms sensitivity (coupling of atmosphere, surface and underground in terms of temperature fluxes) will be described and interpreted under consideration of the rheological response (kinematics) of the regarded landforms. The contribution of this project to the Bündel “Sensitivity of mountain permafrost to climate change (SPCC)” will be the quantification of ongoing process rates at different sites in the Alps and the analysis of spatio-temporal changes, which allows for the determination of the geosystems reaction to climatic change (sensitivity) and the characterisation of geomorphological indicators.

该项目的目的是定量和分析高山永久冻土区的过程速率，以描述地质系统内气候变化的敏感指标。因此，在几十年的时间里，通过应用遥感和大地测量方法，对欧洲阿尔卑斯山不同地区代表永久冻土条件出现的不同地貌（如岩石冰川和冻结的岩屑坡）进行了监测。由此产生的运动学（水平和垂直位移），以及其时空变化被认为是在流变学。过程速率或地形破坏的明显变化--可能与永久冻土退化有关--结合地表和地下温度、内部结构（例如，冰含量，未冻水含量），岩壁退缩率以及区域尺度气候模型的模拟。地形的敏感性（耦合大气，地面和地下的温度通量）将被描述和解释考虑的流变学响应（运动学）的有关地形。 该项目对Bündel“山区永久冻土对气候变化的敏感性”的贡献将是量化阿尔卑斯山不同地点的持续过程速率和分析时空变化，从而能够确定地理系统对气候变化的反应（敏感性）和地貌指标的特征。