DOI: 10.5194/cp-9-2459-2013
Scopus记录号: 2-s2.0-84887736166
论文题名: Multivariate statistic and time series analyses of grain-Size data in quaternary sediments of Lake El'gygytgyn, NE Russia
作者: Francke A. ; Wennrich V. ; Sauerbrey M. ; Juschus O. ; Melles M. ; Brigham-Grette J.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 6 起始页码: 2459
结束页码: 2470
语种: 英语
Scopus关键词: breccia
; eccentricity
; grain size
; lacustrine deposit
; meteorite
; multivariate analysis
; obliquity
; principal component analysis
; Quaternary
; research program
; sediment property
; teleconnection
; time series analysis
; Chukchi
; Elgygytgyn Lake
; Russian Federation
英文摘要: Lake El'gygytgyn, located in the Far East Russian Arctic, was formed by a meteorite impact about 3.58 Ma ago. In 2009, the International Continental Scientific Drilling Program (ICDP) at Lake El'gygytgyn obtained a continuous sediment sequence of the lacustrine deposits and the upper part of the impact breccia. Here, we present grain-size data of the past 2.6 Ma. General downcore grain-size variations yield coarser sediments during warm periods and finer ones during cold periods. According to principal component analysis (PCA), the climate-dependent variations in grain-size distributions mainly occur in the coarse silt and very fine silt fraction. During interglacial periods, accumulation of coarser material in the lake center is caused by redistribution of clastic material by a wind-induced current pattern during the ice-free period. Sediment supply to the lake is triggered by the thickness of the active layer in the catchment and the availability of water as a transport medium. During glacial periods, sedimentation at Lake El'gygytgyn is hampered by the occurrence of a perennial ice cover, with sedimentation being restricted to seasonal moats and vertical conduits through the ice. Thus, the summer temperature predominantly triggers transport of coarse material into the lake center. Time series analysis that was carried out to gain insight into the frequency of the grain-size data showed variations predominately on 98.5, 40.6, and 22.9 kyr oscillations, which correspond to Milankovitch's eccentricity, obliquity and precession bands. Variations in the relative power of these three oscillation bands during the Quaternary suggest that sedimentation processes at Lake El'gygytgyn are dominated by environmental variations caused by global glacial-interglacial variations (eccentricity, obliquity), and local insolation forcing and/or latitudinal teleconnections (precession), respectively. ©Author(s) 2013. 资助项目: NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49349
Appears in Collections: 气候变化与战略
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Recommended Citation:
Francke A.,Wennrich V.,Sauerbrey M.,et al. Multivariate statistic and time series analyses of grain-Size data in quaternary sediments of Lake El'gygytgyn, NE Russia[J]. Climate of the Past,2013-01-01,9(6)