DOI: 10.1007/s00382-014-2237-y
Scopus记录号: 2-s2.0-84929703552
论文题名: Contrasting interannual and multidecadal NAO variability
作者: Woollings T. ; Franzke C. ; Hodson D.L.R. ; Dong B. ; Barnes E.A. ; Raible C.C. ; Pinto J.G.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 45, 期: 2017-01-02 起始页码: 539
结束页码: 556
语种: 英语
英文关键词: Atmosphere–ocean interaction
; Climate reconstructions
; Jet variability
; North Atlantic Oscillation
英文摘要: Decadal and longer timescale variability in the winter North Atlantic Oscillation (NAO) has considerable impact on regional climate, yet it remains unclear what fraction of this variability is potentially predictable. This study takes a new approach to this question by demonstrating clear physical differences between NAO variability on interannual-decadal (<30 year) and multidecadal (>30 year) timescales. It is shown that on the shorter timescale the NAO is dominated by variations in the latitude of the North Atlantic jet and storm track, whereas on the longer timescale it represents changes in their strength instead. NAO variability on the two timescales is associated with different dynamical behaviour in terms of eddy-mean flow interaction, Rossby wave breaking and blocking. The two timescales also exhibit different regional impacts on temperature and precipitation and different relationships to sea surface temperatures. These results are derived from linear regression analysis of the Twentieth Century and NCEP-NCAR reanalyses and of a high-resolution HiGEM General Circulation Model control simulation, with additional analysis of a long sea level pressure reconstruction. Evidence is presented for an influence of the ocean circulation on the longer timescale variability of the NAO, which is particularly clear in the model data. As well as providing new evidence of potential predictability, these findings are shown to have implications for the reconstruction and interpretation of long climate records. © 2014, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54080
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Physics, Atmospheric, Oceanic and Planetary Physics, Parks Rd, Oxford, United Kingdom; Meteorological Institute and Center for Earth System Research and Sustainability, Universität Hamburg, Hamburg, Germany; NCAS-Climate and Department of Meteorology, University of Reading, Reading, United Kingdom; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; Climate and Environmental Physics and Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland; Department of Meteorology, University of Reading, Reading, United Kingdom; Institute for Geophysics and Meteorology, University of Cologne, Cologne, Germany
Recommended Citation:
Woollings T.,Franzke C.,Hodson D.L.R.,et al. Contrasting interannual and multidecadal NAO variability[J]. Climate Dynamics,2015-01-01,45(2017-01-02)