DOI: 10.5194/cp-10-209-2014
Scopus记录号: 2-s2.0-84893566852
论文题名: Biogeochemical variability during the past 3.6 million years recorded by FTIR spectroscopy in the sediment record of Lake El'gygytgyn, Far East Russian Arctic
作者: Meyer-Jacob C. ; Vogel H. ; Gebhardt A.C. ; Wennrich V. ; Melles M. ; Rosen P.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2014
卷: 10, 期: 1 起始页码: 209
结束页码: 220
语种: 英语
Scopus关键词: accumulation rate
; climate variation
; FTIR spectroscopy
; glacial-interglacial cycle
; paleoclimate
; Quaternary
; regression analysis
; Chukchi
; Elgygytgyn Lake
; Far East
; Russian Federation
英文摘要: A number of studies have shown that Fourier transform infrared spectroscopy (FTIRS) can be applied to quantitatively assess lacustrine sediment constituents. In this study, we developed calibration models based on FTIRS for the quantitative determination of biogenic silica (BSi; n Combining double low line 420; gradient: 0.9-56.5%), total organic carbon (TOC; n Combining double low line 309; gradient: 0-2.9%), and total inorganic carbon (TIC; n Combining double low line 152; gradient: 0-0.4%) in a 318 m-long sediment record with a basal age of 3.6 million years from Lake El'gygytgyn, Far East Russian Arctic. The developed partial least squares (PLS) regression models yield high cross-validated (CV) R 2CV Combining double low line 0.86-0.91 and low root mean square error of cross-validation (RMSECV) (3.1-7.0% of the gradient for the different properties). By applying these models to 6771 samples from the entire sediment record, we obtained detailed insight into bioproductivity variations in Lake El'gygytgyn throughout the middle to late Pliocene and Quaternary. High accumulation rates of BSi indicate a productivity maximum during the middle Pliocene (3.6-3.3 Ma), followed by gradually decreasing rates during the late Pliocene and Quaternary. The average BSi accumulation during the middle Pliocene was ∼3 times higher than maximum accumulation rates during the past 1.5 million years. The indicated progressive deterioration of environmental and climatic conditions in the Siberian Arctic starting at ca. 3.3 Ma is consistent with the first occurrence of glacial periods and the finally complete establishment of glacial-interglacial cycles during the Quaternary. ©Author(s) 2014. 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/49316
Appears in Collections: 气候变化与战略
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Recommended Citation:
Meyer-Jacob C.,Vogel H.,Gebhardt A.C.,et al. Biogeochemical variability during the past 3.6 million years recorded by FTIR spectroscopy in the sediment record of Lake El'gygytgyn, Far East Russian Arctic[J]. Climate of the Past,2014-01-01,10(1)