DOI: 10.5194/tc-14-1437-2020
论文题名: Ground subsidence and heave over permafrost: Hourly time series reveal interannual, seasonal and shorter-term movement caused by freezing, thawing and water movement
作者: Gruber S.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 4 起始页码: 1437
结束页码: 1447
语种: 英语
英文关键词: climate change
; freeze-thaw cycle
; freezing
; ground-based measurement
; heave
; infiltration
; permafrost
; precipitation (climatology)
; satellite data
; seasonal variation
; subsidence
英文摘要: Heave and subsidence of the ground surface can offer insight into processes of heat and mass transfer in freezing and thawing soils. Additionally, subsidence is an important metric for monitoring and understanding the transformation of permafrost landscapes under climate change. Corresponding ground observations, however, are sparse and episodic. A simple tilt-arm apparatus with logging inclinometer has been developed to measure heave and subsidence of the ground surface with hourly resolution and millimeter accuracy. This contribution reports data from the first two winters and the first full summer, measured at three sites with contrasting organic and frost-susceptible soils in warm permafrost. The patterns of surface movement differ significantly between sites and from a prediction based on the Stefan equation and observed ground temperature. The data are rich in features of heave and subsidence that are several days to several weeks long and that may help elucidate processes in the ground. For example, late-winter heave followed by thawing and subsidence, as reported in earlier literature and hypothesized to be caused by infiltration and refreezing of water into permeable frozen ground, has been detected. An early-winter peak in heave, followed by brief subsidence, is discernible in a previous publication but so far has not been interpreted. An effect of precipitation on changes in surface elevation can be inferred with confidence. These results highlight the potential of ground-based observation of subsidence and heave as an enabler of progress in process understanding, modeling and interpretation of remotely sensed data. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164471
Appears in Collections: 气候变化与战略
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作者单位: Department of Geography and Environmental Studies, Carleton University, Ottawa, ON K1S 5B6, Canada
Recommended Citation:
Gruber S.. Ground subsidence and heave over permafrost: Hourly time series reveal interannual, seasonal and shorter-term movement caused by freezing, thawing and water movement[J]. Cryosphere,2020-01-01,14(4)