DOI: 10.1007/s00382-016-3360-8
Scopus记录号: 2-s2.0-84988728345
论文题名: Coherency of late Holocene European speleothem δ18O records linked to North Atlantic Ocean circulation
作者: Deininger M. ; McDermott F. ; Mudelsee M. ; Werner M. ; Frank N. ; Mangini A.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 49, 期: 2017-01-02 起始页码: 595
结束页码: 618
语种: 英语
英文关键词: ISOW
; Palaeoclimate dynamics
; Spatio-temporal coherency
; Speleothems
; Subpolar gyre
; Westerlies
英文摘要: Speleothem δ18O records provide valuable information about past continental environmental and climatic conditions, although their interpretation is often not straightforward. Here we evaluate a compilation of late Holocene speleothem δ18O records using a Monte Carlo based Principal Component Analysis (MC-PCA) method that accounts for uncertainties in individual speleothem age models and for the variable temporal resolution of each δ18O record. The MC-PCA approach permits not only the identification of temporally coherent changes in speleothem δ18O; it also facilitates their graphical depiction and evaluation of their spatial coherency. The MC-PCA method was applied to 11 Holocene speleothem δ18O records that span most of the European continent (apart from the circum-Mediterranean region). We observe a common (shared) mode of speleothem δ18O variability that suggests millennial-scale coherency and cyclicity during the last 4.5 ka. These changes are likely caused by variability in atmospheric circulation akin to that associated with the North Atlantic Oscillation, reflecting meridionally shifted westerlies. We argue that these common large-scale variations in European speleothem δ18O records are in phase with changes in the North Atlantic Ocean circulation indicated by the vigour of the Iceland Scotland Overflow Water (ISOW), the strength of the subpolar gyre (SPG) and an ocean stacked North Atlantic ice rafted debris (IRD) index. Based on a recent modelling study, we conclude that these changes in the North Atlantic circulation history may be caused by wind stress on the ocean surface driven by shifted westerlies. However, the mechanisms that ultimately force the westerlies remain unclear. © 2016, Springer-Verlag Berlin Heidelberg. 资助项目: SFI, Science Foundation Ireland
; SFI, Science Foundation Ireland
; IRCSET, Irish Research Council for Science, Engineering and Technology
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53158
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: UCD School of Earth Sciences, University College Dublin, Belfield, Dublin 4, Ireland; UCD Earth Institute, University College Dublin, Belfield, Dublin 4, Ireland; Climate Risk Analysis, Kreuzstrasse 27, Heckenbeck, Bad Gandersheim, Germany; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bussestraße 24, Bremerhaven, Germany; Institute of Environmental Physics, Heidelberg University, Im Neuenheimer Feld 229, Heidelberg, Germany
Recommended Citation:
Deininger M.,McDermott F.,Mudelsee M.,et al. Coherency of late Holocene European speleothem δ18O records linked to North Atlantic Ocean circulation[J]. Climate Dynamics,2017-01-01,49(2017-01-02)