DOI: 10.5194/cp-10-1109-2014
Scopus记录号: 2-s2.0-84902292845
论文题名: Past freeze and thaw cycling in the margin of the El'gygytgyn crater deduced from a 141 m long permafrost record
作者: Schwamborn G. ; Meyer H. ; Schirrmeister L. ; Fedorov G.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2014
卷: 10, 期: 3 起始页码: 1109
结束页码: 1123
语种: 英语
Scopus关键词: data set
; freeze-thaw cycle
; lacustrine deposit
; mass movement
; metal
; permafrost
; precipitation (climatology)
; sediment analysis
; turbidity
; Chukchi
; Elgygytgyn Lake
; Russian Federation
英文摘要: The continuous sediment record from Lake El'gygytgyn in the northeastern Eurasian Arctic spans the last 3.6 Ma and for much of this time permafrost dynamics and lake level changes have likely played a crucial role for sediment delivery to the lake. Changes in the ground-ice hydrochemical composition (δ18O, δD, pH, electrical conductivity, Na+, Mg2+, Ca2+, K+, HCO3-, Cl-, SO4-) of a 141 m long permafrost record from the western crater plain are examined to reconstruct repeated periods of freeze and thaw at the lake edge. Stable water isotope and major ion records of ground ice in the permafrost reflect both a synsedimentary palaeo-precipitation signal preserved in the near-surface permafrost (0.0-9.1 m core depth) and a post-depositional record of thawing and refreezing in deeper layers of the core (9.1-141.0 m core depth). These lake marginal permafrost dynamics were controlled by lake level changes that episodically flooded the surfaces and induced thaw in the underlying frozen ground. During times of lake level fall these layers froze over again. At least three cycles of freeze and thaw are identified and the hydrochemical data point to a vertical and horizontal talik refreezing through time. Past permafrost thaw and freeze may have destabilised the basin slopes of Lake El'gygytgyn and this has probably promoted the release of mass movements from the lake edge to the deeper basin as known from frequently occurring turbidite layers in the lake sediment column. © Author(s) 2014. 资助项目: RAS, Russian Academy of Sciences
; RFBR, Russian Academy of Sciences
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49259
Appears in Collections: 气候变化与战略
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Recommended Citation:
Schwamborn G.,Meyer H.,Schirrmeister L.,et al. Past freeze and thaw cycling in the margin of the El'gygytgyn crater deduced from a 141 m long permafrost record[J]. Climate of the Past,2014-01-01,10(3)