气候变化领域集成服务门户(CCPortal): Absence of Age-Related Trends in Stable Oxygen Isotope Ratios From Oak Tree Rings

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DOI	10.1029/2019GB006195
	Absence of Age-Related Trends in Stable Oxygen Isotope Ratios From Oak Tree Rings
	Duffy J.E.; McCarroll D.; Loader N.J.; Young G.H.F.; Davies D.; Miles D.; Bronk Ramsey C.
发表日期	2019
ISSN	0886-6236
EISSN	1944-9224
起始页码	841
结束页码	848
卷号	33 期号:7
英文摘要	The potential for age-related trends in the stable oxygen isotope ratios of latewood alpha cellulose was investigated in samples of living oak trees and historic building timbers from the UK. When the series are examined individually, it is clear that the strongest trends in individual trees and timbers reflect concurrent trends in climate. Nonclimatic trends are very small and represent random noise that can be removed by averaging. If the same data are analyzed using the more conventional approach of aligning the series by ring number and fitting a regression line, so that the magnitude of the age trend is based on the slope of the mean and the statistical significance on the correlation coefficient, the results are very different. We demonstrate that this conventional approach regularly produces spurious age trends with grossly inflated probabilities, because of offsets in the mean values of series of different length. We conclude that there is no need to detrend stable oxygen isotope series from individual trees or timbers of oak from the UK and that to do so would remove important climatic information. Long isotope chronologies can safely be constructed by combining data from multiple individual trees, or by pooling material from trees prior to chemical treatment and isotopic measurement. Age-related trends may occur in other species or in other regions, but where they have been identified using the conventional “slope of the mean” approach they should be reassessed using the “mean of the slope” approach. ©2019. The Authors.
英文关键词	age trends; dendrochronology; paleoclimate; Quercus; UK
语种	英语
scopus关键词	age structure; cellulose; climate effect; dendrochronology; historic building; oxygen isotope; paleoclimate; stable isotope; tree ring; trend analysis; United Kingdom; Quercus
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129755
作者单位	Department of Geography, Swansea University, Swansea, United Kingdom; Research Laboratory for Archaeology and the History of Art, Oxford University, Oxford, United Kingdom
推荐引用方式 GB/T 7714	Duffy J.E.,McCarroll D.,Loader N.J.,et al. Absence of Age-Related Trends in Stable Oxygen Isotope Ratios From Oak Tree Rings[J],2019,33(7).
APA	Duffy J.E..,McCarroll D..,Loader N.J..,Young G.H.F..,Davies D..,...&Bronk Ramsey C..(2019).Absence of Age-Related Trends in Stable Oxygen Isotope Ratios From Oak Tree Rings.Global Biogeochemical Cycles,33(7).
MLA	Duffy J.E.,et al."Absence of Age-Related Trends in Stable Oxygen Isotope Ratios From Oak Tree Rings".Global Biogeochemical Cycles 33.7(2019).