期刊
WATER RESOURCES RESEARCH
卷 55, 期 11, 页码 9838-9857出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2018WR024488
关键词
talik; permafrost thaw; thermal modeling; freeze-thaw; discontinuous permafrost; peatland
资金
- Liidlii Kue First Nation
- Jean Marie River First Nation
- Government of the Northwest Territories
- Cold Regions Research Centre
- NSERC CRD
- Polar Knowledge Canada
- NSERC
- Northern Scientific Training Program
- Wilfrid Laurier University
Taliks (perennially thawed soil in a permafrost environment) are generally found beneath water bodies or wetlands, and their development and evolution in other environments is poorly documented. Sustained isolated taliks between seasonally frozen surface soils and permafrost have been observed at the Scotty Creek Research Station in the discontinuous permafrost region of the Northwest Territories, Canada. These taliks have been expanding both vertically and laterally over the past decade of monitoring. The main controls on expansion are thought to be (1) the availability of energy, determined by incoming radiation and advective heat flux, (2) the ability to transfer this energy to the freezing/thawing front, determined by the thermal conductivity (soil properties and moisture content), and (3) the presence and thickness of the snowpack. These controls are investigated using data collected in the field to inform a 1-D coupled thermodynamic freeze-thaw and unsaturated flow model. The model was successfully used to represent observed thaw rates in different parts of the landscape. It is found that high soil moisture, deeper snowpacks, and warmer or faster advective flow rates all contribute to accelerated talik growth and subsequent permafrost degradation. Simulations show that slight perturbations of available energy or soil properties, such as an increase in average surface temperature of 0.5 degrees C or a 1-cm change in snow water equivalent, can lead to talik formation, highlighting the vulnerability of this landscape to changes in climate or land cover.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据