DOI: 10.1029/2018JF004655
Scopus记录号: 2-s2.0-85052448784
论文题名: Modeling Long-Term Permafrost Degradation
作者: Nicolsky D.J. ; Romanovsky V.E.
刊名: Journal of Geophysical Research: Earth Surface
ISSN: 21699003
出版年: 2018
卷: 123, 期: 8 起始页码: 1756
结束页码: 1771
语种: 英语
英文关键词: heat flux
; modeling
; permafrost
; thawing
; unfrozen liquid water
英文摘要: Permafrost, as an important part of the Cryosphere, has been strongly affected by climate warming, and a wide spread of permafrost responses to the warming is currently observed. In particular, at some locations rather slow rates of permafrost degradations are noticed. We related this behavior to the presence of unfrozen water in frozen fine-grained earth material. In this paper, we examine not-very-commonly-discussed heat flux from the ground surface into the permafrost and consequently discuss implications of the presence of unfrozen liquid water on long-term thawing of permafrost. We conducted a series of numerical experiments and demonstrated that the presence of fine-grained material with substantial unfrozen liquid water content at below 0°C temperature can significantly slow down the thawing rate and hence can increase resilience of permafrost to the warming events. This effect is highly nonlinear, and a difference between the rates of thawing in fine- and coarse-grained materials is more drastic for lower values of heat flux incoming into permafrost. For high heat flux, the difference between these rates almost disappears. As near-surface permafrost temperature increases towards 0°C and the changes in the ground temperature become less evident, the future observation networks should try to incorporate measurements of unfrozen liquid water content in the near-surface permafrost and heat flux into permafrost in addition to the existing temperature observations. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113414
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States; Earth Cryosphere Institute, Tyumen Scientific Centre SB RAS, Tyumen, Russian Federation; Department of Cryosophy, Tyumen State University, Tyumen, Russian Federation
Recommended Citation:
Nicolsky D.J.,Romanovsky V.E.. Modeling Long-Term Permafrost Degradation[J]. Journal of Geophysical Research: Earth Surface,2018-01-01,123(8)