DOI: 10.1016/j.quascirev.2015.04.010
Scopus记录号: 2-s2.0-84929394794
论文题名: Identifying coherent patterns of environmental change between multiple, multivariate records: an application to four 1000-year diatom records from Victoria, Australia
作者: Tyler J.J. ; Mills K. ; Barr C. ; Sniderman J.M.K. ; Gell P.A. ; Karoly D.J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 119 起始页码: 94
结束页码: 105
语种: 英语
英文关键词: Climate change
; Holocene
; Ordination
; Palaeoecology
; Synthesis
Scopus关键词: Ecology
; Lakes
; Orthogonal functions
; Sediments
; Site selection
; Synthesis (chemical)
; Detrended correspondence analysis
; Empirical Orthogonal Function
; Environmental change
; Holocenes
; Ordination
; Palaeoecology
; South-eastern Australia
; Victoria , Australia
; Climate change
; climate change
; climate variation
; correlation
; data set
; diatom
; Holocene
; lacustrine deposit
; nonlinearity
; ordination
; paleoecology
; signal
; Australia
; Victoria [Australia]
; Bacillariophyta
英文摘要: Empirical orthogonal functions (EOFs) of indirect archives of environmental change are increasingly used to identify coherent trends between palaeoclimate records, to separate externally forced patterns from locally driven idiosyncrasies. Lake sediments are particularly suited to such syntheses: they are abundant in most landscapes and record a wide array of information, yet local complexities often conceal or confuse the climate signal recorded at individual sites. Lake sediment parameters usually exhibit non-linear, multivariate and indirect responses to climate, therefore identifying coherent patterns between two or more lake records presents a complex challenge. Ideally, the selection of representative variables should be non-subjective and inclusive of as many different variables as possible, allowing for unexpected correlations between sites. In order to meet such demands, we propose a two-tier ordination procedure whereby site-specific (local) ordinations, obtained using Detrended Correspondence Analysis (DCA), are nested within a second, regional EOF. Using the local DCAs as representative variables allows the retention of a larger fraction of variance from each site, removes any subjectivity from variable selection and retains the potential for observing multiple, coherent signals from within and between each dataset. We explore this potential using four decadally resolved diatom records from volcanic lakes in Western Victoria, Australia. The records span the 1000 years prior to European settlement in CE 1803. Our analyses reveal at least two coherent patterns of ecological change that are manifest in each of the four datasets, patterns which may have been overlooked by a single-variable, empirical orthogonal function approach. This intra-site coherency provides a valuable step towards understanding multi-decadal hydroclimate variability in southeastern Australia. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59920
Appears in Collections: 过去全球变化的重建
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作者单位: School of Earth Sciences, University of Melbourne, Australia; Water Research Network, Federation University, Australia; Department of Earth Sciences, University of Adelaide, Australia; British Geological Survey, Keyworth, Nottingham, United Kingdom; Department of Geography, Loughborough University, United Kingdom; School of Geography, Environment and Population, University of Adelaide, Australia
Recommended Citation:
Tyler J.J.,Mills K.,Barr C.,et al. Identifying coherent patterns of environmental change between multiple, multivariate records: an application to four 1000-year diatom records from Victoria, Australia[J]. Quaternary Science Reviews,2015-01-01,119