Controls on high-latitude mountain permafrost distribution and sensitivity to climate change

高纬度山区多年冻土分布及其对气候变化敏感性的控制

• 批准号: RGPIN-2017-04096
• 负责人: Bonnaventure, Philip
• 金额: $ 1.97万
• 依托单位: University of Lethbridge
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=633944
• 关键词: Controls; latitude; mountain; permafrost; distribution

The goal of my research program is to examine dissimilar high-latitude mountains across a latitudinal transect to assess how changes to surface inversion (the atypical pattern of warming with elevation) frequency and magnitude may impact permafrost distribution in the warming climate of northwestern Canada. Additionally, my program aims to examine the hypothesis of elevation dependent warming (EDW), a conceptual model suggesting that the rate of future warming is expected to be amplified at high elevation relative to adjacent low elevation environments. This program will involve the training of five HQP focused on a framework to test the concept that thawing of high-latitude mountain permafrost will not follow a typical elevation or latitudinal gradient, but will rather be linked to local climate, geomorphology and vegetation, resulting in a heterogeneous pattern of thaw. My program looks to adjust the EDW hypothesis in order to be more inclusive of variable mountainous environments across Canada. Methods aim to utilize a combination of field, geomatic modelling and data analysis techniques within two broad mountainous regions including the highly continental Mackenzie Mountains and the high-latitude Ogilvie Mountains. My program focuses on the independent gathering of data in these sites using weather stations and data loggers arranged along elevational and latitudinal transects examining the impact of tree presence, valley structure relating to solar radiation, and continentality. Amalgamating these data with both reanalysis climate data and climate projections, the overall objective will be to assess the reshaping of the topo-temperature field and gauge how this reshaping will impact the spatial distribution of thaw and the potential for permafrost-related hazards.

我的研究计划的目的是检查沿纬度样带的不同高纬度山脉，以评估表面反转的变化如何变化（高升高的非典型变暖模式）频率和大小可能会影响加拿大西北部变暖气候中永久冻土分布。此外，我的计划旨在检查依赖性变暖的假设（EDW），一个概念模型表明，相对于相邻的低海拔环境，预计将来的变暖速率有望在高海拔地区放大。该计划将涉及培训五个HQP，该培训集中在一个框架上，以测试以下概念：高纬度山脉永久冻土将不会遵循典型的海拔高度或纬度梯度，但宁愿与当地气候，地貌和植被相关，从而导致杂种式的混血模式。我的计划旨在调整EDW假设，以便在加拿大更具可变的山区环境。旨在利用在两个广阔的山区内的田间，地质建模和数据分析技术组合的方法，包括高度大陆麦肯齐山脉和高纬度的Ogilvie山脉。我的计划着重于使用沿高度和纬度样带安排的气象站和数据记录仪在这些站点中独立收集数据，研究了树木存在的影响，与太阳辐射有关的山谷结构以及大陆。将这些数据与重新分析的气候数据和气候预测融合在一起，总体目标是评估托托温度场的重塑，并衡量这种重塑将如何影响解冻的空间分布以及永久冻土相关危害的潜力。