Arid
DOI10.1016/j.revpalbo.2015.12.006
Evaluation of a modern-analogue methodology for reconstructing Australian palaeoclimate from pollen
Herbert, Annika V.1; Harrison, Sandy P.1,2,3
通讯作者Herbert, Annika V.
来源期刊REVIEW OF PALAEOBOTANY AND PALYNOLOGY
ISSN0034-6667
EISSN1879-0615
出版年2016
卷号226页码:65-77
英文摘要

Quantitative palaeoclimate reconstructions are widely used to evaluate climate model performance. Here, as part of an effort to provide such a data set for Australia, we examine the impact of analytical decisions and sampling assumptions on modern-analogue reconstructions using a continent-wide pollen data set. There is a high degree of correlation between temperature variables in the modern climate of Australia, but there is sufficient orthogonality in the variations of precipitation, summer and winter temperature and plant-available moisture to allow independent reconstructions of these four variables to be made. The method of analogue selection does not affect the reconstructions, although bootstrap resampling provides a more reliable technique for obtaining robust measures of uncertainty. The number of analogues used affects the quality of the reconstructions: the most robust reconstructions are obtained using 5 analogues. The quality of reconstructions based on post-1850 CE pollen samples differ little from those using samples from between 1450 and 1849 CE, showing that European post settlement modification of vegetation has no impact on the fidelity of the reconstructions although it substantially increases the availability of potential analogues. Reconstructions based on core top samples are more realistic than those using surface samples, but only using core top samples would substantially reduce the number of available analogues and therefore increases the uncertainty of the reconstructions. Spatial and/or temporal averaging of pollen assemblages prior to analysis negatively affects the subsequent reconstructions for some variables and increases the associated uncertainties. In addition, the quality of the reconstructions is affected by the degree of spatial smoothing of the original climate data, with the best reconstructions obtained using climate data from a 0.5 resolution grid, which corresponds to the typical size of the pollen catchment This study provides a methodology that can be used to provide reliable palaeoclimate reconstructions for Australia, which will fill in a major gap in the data sets used to evaluate climate models. (C) 2016 The Authors. Published by Elsevier B.V.


英文关键词Climate reconstructions Modern analogue technique Pollen surface samples Bioclimatic variables Human impact Palaeoclimate benchmarking
类型Article
语种英语
国家Australia ; England
收录类别SCI-E
WOS记录号WOS:000371369700007
WOS关键词LAST GLACIAL MAXIMUM ; C-14 YR BP ; QUANTITATIVE RECONSTRUCTION ; LATE QUATERNARY ; NORTH-AMERICA ; SOURCE AREA ; TEMPERATURE VARIABILITY ; CLIMATIC-CHANGE ; MOSS CUSHIONS ; ARID ZONE
WOS类目Plant Sciences ; Paleontology
WOS研究方向Plant Sciences ; Paleontology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/196057
作者单位1.Macquarie Univ, Dept Biol Sci, N Ryde, NSW 2109, Australia;
2.Univ Reading, Ctr Climate Change, Reading RG6 6AB, Berks, England;
3.Univ Reading, SAGES, Reading RG6 6AB, Berks, England
推荐引用方式
GB/T 7714
Herbert, Annika V.,Harrison, Sandy P.. Evaluation of a modern-analogue methodology for reconstructing Australian palaeoclimate from pollen[J],2016,226:65-77.
APA Herbert, Annika V.,&Harrison, Sandy P..(2016).Evaluation of a modern-analogue methodology for reconstructing Australian palaeoclimate from pollen.REVIEW OF PALAEOBOTANY AND PALYNOLOGY,226,65-77.
MLA Herbert, Annika V.,et al."Evaluation of a modern-analogue methodology for reconstructing Australian palaeoclimate from pollen".REVIEW OF PALAEOBOTANY AND PALYNOLOGY 226(2016):65-77.
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