DOI: 10.1002/2014GL059251
论文题名: New permafrost is forming around shrinking Arctic lakes, but will it last?
作者: Briggs M.A. ; Walvoord M.A. ; McKenzie J.M. ; Voss C.I. ; Day-Lewis F.D. ; Lane J.W.
刊名: Geophysical Research Letters
ISSN: 0094-10293
EISSN: 1944-10024
出版年: 2014
卷: 41, 期: 5 起始页码: 1585
结束页码: 1592
语种: 英语
英文关键词: Arctic
; climate change
; cold-regions
; ecological succession
; groundwater modeling
; permafrost
Scopus关键词: Climate change
; Climate models
; Ecology
; Groundwater
; Groundwater flow
; Heat transfer
; Lakes
; Shrinkage
; Thawing
; Arctic
; Climatic conditions
; cold-regions
; Ecological successions
; Groundwater modeling
; Permafrost thaws
; Soil conditions
; Variably saturated
; Permafrost
; aggradation
; climate conditions
; climate effect
; freeze-thaw cycle
; groundwater flow
; heat transfer
; lake ecosystem
; permafrost
; shrinkage
; simulation
; Alaska
; Twelvemile Lake
; United States
; Salix
英文摘要: Widespread lake shrinkage in cold regions has been linked to climate warming and permafrost thaw. Permafrost aggradation, however, has been observed within the margins of recently receded lakes, in seeming contradiction of climate warming. Here permafrost aggradation dynamics are examined at Twelvemile Lake, a retreating lake in interior Alaska. Observations reveal patches of recently formed permafrost within the dried lake margin, colocated with discrete bands of willow shrub. We test ecological succession, which alters shading, infiltration, and heat transport, as the driver of aggradation using numerical simulation of variably saturated groundwater flow and heat transport with phase change (i.e., freeze-thaw). Simulations support permafrost development under current climatic conditions, but only when net effects of vegetation on soil conditions are incorporated, thus pointing to the role of ecological succession. Furthermore, model results indicate that permafrost aggradation is transitory with further climate warming, as new permafrost thaws within seven decades. Key Points New permafrost is forming around shrinking arctic lakes Shading by willow shrubs primarily drives new permafrost formation Further climate warming thaws new permafrost within 7 decades ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84895602983&doi=10.1002%2f2014GL059251&partnerID=40&md5=6fc8837739d43ee197b557ce83414fea
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7557
Appears in Collections: 气候减缓与适应
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作者单位: Office of Groundwater, Branch of Geophysics, U.S. Geological Survey, Storrs CT, United States
Recommended Citation:
Briggs M.A.,Walvoord M.A.,McKenzie J.M.,et al. New permafrost is forming around shrinking Arctic lakes, but will it last?[J]. Geophysical Research Letters,2014-01-01,41(5).