气候变化领域集成服务门户(CCPortal): Active layer freeze-thaw and water storage dynamics in permafrost environments inferred from InSAR

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DOI	10.1016/j.rse.2020.112007
	Active layer freeze-thaw and water storage dynamics in permafrost environments inferred from InSAR
	Chen J.; Wu Y.; O'Connor M.; Cardenas M.B.; Schaefer K.; Michaelides R.; Kling G.
发表日期	2020
ISSN	00344257
卷号	248
英文摘要	In cold regions where soils freeze and thaw annually, the ground surface deforms due to the density difference between groundwater and ground ice. Here we mapped thaw subsidence and frost heave signals over the Toolik Lake area on the North Slope of Alaska using 12 ALOS PALSAR Interferometric Synthetic Aperture Radar (InSAR) scenes (2006–2010). For the first time, we jointly analyzed InSAR observations with a large number of soil measurements collected within ~ 100 km of the Toolik Field Station. We found that the InSAR-observed deformation patterns are mainly related to soil water content and the seasonal active layer freeze-thaw (FT) cycle. We did not observe any substantial long-term subsidence trend outside the 2007 Anaktuvuk River Fire scar. This suggests that the magnitude of the maximum annual thaw subsidence did not change much outside the fire zone during the study period. The joint analysis of InSAR and field observations allows us to show that the amplitude of the seasonal thaw subsidence is proportional to the total amount of ice that has melted into liquid water at any given time. We note that topography influences the spatial distribution of soil water content, and the availability of soil water influences the type of vegetation that can grow. As a result, we found that the average seasonal thaw subsidence increases along a geomorphic-ecohydrologic transect with heath vegetation on the drier ridge-tops, tussock tundra on hillslopes, and sedge tundra at the wet lowland riparian zones. In addition, we detected a net uplift between late July and early September, mostly in the wetter riparian zone that experienced a larger seasonal thaw subsidence. Toolik Field Station in-situ records suggest that the air temperature fluctuated around or below freezing in early September during the ALOS PALSAR data acquisition times (at ~ 12 am local time). In this scenario, ice can be formed at the top of the soil, which leads to frost heave in saturated soils. Our results highlight how InSAR can improve our understanding of active layer freeze-thaw and water storage dynamics in permafrost environments. © 2020 The Authors
英文关键词	Active layer; Freeze-thaw cycle; InSAR; Permafrost; Soil water; Vegetation cover
语种	英语
scopus关键词	Data acquisition; Digital storage; Freezing; Groundwater; Ice; Landforms; Permafrost; Soil moisture; Subsidence; Synthetic aperture radar; Thawing; Topography; Vegetation; Alos palsar datum; Deformation pattern; Density difference; Field observations; Interferometric synthetic aperture radars; North Slope of Alaska; Permafrost environment; Soil water content; Soil surveys; air temperature; data acquisition; freeze-thaw cycle; frost heave; PALSAR; permafrost; riparian zone; soil water; spatial distribution; synthetic aperture radar; topography; Alaska; Anaktuvuk River; North Slope; Toolik Field Station; Toolik Lake; United States
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179181
作者单位	Department of Aerospace Engineering and Engineering Mechanics, Cockrell School of Engineering, The University of Texas at Austin, Austin, TX, United States; Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, United States; National Snow and Ice Data Center, Cooperative Institute for Research in Environmental Sciences, University of Colorado at Boulder, Boulder, CO, United States; Department of Geophysics, Colorado School of Mines, Golden, CO 80401, United States; Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI, United States
推荐引用方式 GB/T 7714	Chen J.,Wu Y.,O'Connor M.,et al. Active layer freeze-thaw and water storage dynamics in permafrost environments inferred from InSAR[J],2020,248.
APA	Chen J..,Wu Y..,O'Connor M..,Cardenas M.B..,Schaefer K..,...&Kling G..(2020).Active layer freeze-thaw and water storage dynamics in permafrost environments inferred from InSAR.Remote Sensing of Environment,248.
MLA	Chen J.,et al."Active layer freeze-thaw and water storage dynamics in permafrost environments inferred from InSAR".Remote Sensing of Environment 248(2020).