Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018WR024488 |
Taliks: A Tipping Point in Discontinuous Permafrost Degradation in Peatlands | |
Devoie, Elise G.1; Craig, James R.1; Connon, Ryan F.2; Quinton, William L.2 | |
2019-11-25 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2019 |
文章类型 | Article;Early Access |
语种 | 英语 |
国家 | Canada |
英文摘要 | 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. |
英文关键词 | talik permafrost thaw thermal modeling freeze-thaw discontinuous permafrost peatland |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000498357300001 |
WOS关键词 | ACTIVE-LAYER ; NORTHWEST-TERRITORIES ; COLD REGIONS ; HYDRAULIC CONDUCTIVITY ; GROUNDWATER-FLOW ; ENERGY-TRANSPORT ; WATER-BALANCE ; HEAT-TRANSFER ; SCOTTY CREEK ; HYDROLOGY |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/223928 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Waterloo, Dept Civil & Environm Engn, Waterloo, ON, Canada; 2.Wilfrid Laurier Univ, Cold Reg Res Ctr, Waterloo, ON, Canada |
推荐引用方式 GB/T 7714 | Devoie, Elise G.,Craig, James R.,Connon, Ryan F.,et al. Taliks: A Tipping Point in Discontinuous Permafrost Degradation in Peatlands[J]. WATER RESOURCES RESEARCH,2019. |
APA | Devoie, Elise G.,Craig, James R.,Connon, Ryan F.,&Quinton, William L..(2019).Taliks: A Tipping Point in Discontinuous Permafrost Degradation in Peatlands.WATER RESOURCES RESEARCH. |
MLA | Devoie, Elise G.,et al."Taliks: A Tipping Point in Discontinuous Permafrost Degradation in Peatlands".WATER RESOURCES RESEARCH (2019). |
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