DOI: 10.1007/s00382-015-2950-1
Scopus记录号: 2-s2.0-84954349493
论文题名: The effect of the East Atlantic pattern on the precipitation δ18O-NAO relationship in Europe
作者: Comas-Bru L. ; McDermott F. ; Werner M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 47, 期: 2017-07-08 起始页码: 2059
结束页码: 2069
语种: 英语
英文关键词: East Atlantic pattern
; ECHAM5-wiso model
; GNIP database
; North Atlantic Oscillation
; Precipitation δ18O
英文摘要: The North Atlantic Oscillation (NAO) is known to influence precipitation δ18O (δ18Op) through its control on air temperature and on the trajectory of the westerly winds that carry moisture onto Europe during boreal winters. Hence, paleoclimate studies seeking to reconstruct the NAO can exploit the δ18O signal that is commonly preserved in natural archives such as stalagmites, ice cores, tree rings and lake sediments. However, such reconstructions should consider the uncertainties that arise from non-stationarities in the δ18Op-NAO relationship. Here, new insights into the causes of these temporal non-stationarities are presented for the European region using both observations (GNIP database) and the output of an isotope-enabled general circulation model (ECHAM5-wiso). The results show that, although the East Atlantic (EA) pattern is generally uncorrelated to δ18Op during the instrumental period, its polarity affects the δ18Op-NAO relationship. Non-stationarities in this relationship result from spatial shifts of the δ18Op-NAO correlated areas as a consequence of different NAO/EA combinations. These shifts are consistent with those reported previously for NAO-winter climate variables and the resulting non-stationarities mean that δ18O-based NAO reconstructions could be compromised if the balance of positive and negative NAO/EA states differs substantially in a calibration period compared with the period of interest in the past. The same approach has been followed to assess the relationships between δ18Op and both winter total precipitation and winter mean surface air temperature, with similar results. Crucially, this study also identifies regions within Europe where temporal changes in the NAO, air temperature and precipitation can be more robustly reconstructed using δ18O time series from natural archives, irrespective of concomitant changes in the EA. © 2016, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53514
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 College Dublin, Belfield, Dublin 4, Ireland; UCD Earth Institute, University College Dublin, Belfield, Dublin 4, Ireland; Division Climate Science - Paleoclimate Dynamics, Helmholtz Centre for Polar and Marine Research, Alfred Wegener Institute, Bussestr. 24, Bremerhaven, Germany
Recommended Citation:
Comas-Bru L.,McDermott F.,Werner M.. The effect of the East Atlantic pattern on the precipitation δ18O-NAO relationship in Europe[J]. Climate Dynamics,2016-01-01,47(2017-07-08)