DOI: 10.1175/JCLI-D-14-00813.1
Scopus记录号: 2-s2.0-84949990515
论文题名: Multiple equilibria as a possible mechanism for decadal variability in the North Atlantic Ocean
作者: Born A. ; Mignot J. ; Stocker T.F.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 22 起始页码: 8907
结束页码: 8922
语种: 英语
Scopus关键词: Atmospheric temperature
; Catchments
; Climate models
; Climatology
; Dynamics
; Forecasting
; Heat flux
; Oceanography
; Stochastic systems
; Climate prediction
; Geographic location
; Gyres
; North Atlantic Ocean
; Ocean dynamics
; Stochastic models
英文摘要: Decadal climate variability in the North Atlantic has received increased attention in recent years, because modeling results suggest predictability of heat content and circulation indices several years ahead. However, determining the applicability of these results in the real world is challenging because of an incomplete understanding of the underlying mechanisms. Here, the authors show that recent attempts to reconstruct the decadal variations in one of the dominant circulation systems of the region, the subpolar gyre (SPG), are not always consistent. A coherent picture is partly recovered by a simple conceptual model solely forced by reanalyzed surface air temperatures. This confirms that surface heat flux indeed plays a leading role for this type of variability, as has been suggested in previous studies. The results further suggest that large variations in the SPG correspond to the crossing of a bifurcation point that is predicted from idealized experiments and an analytical solution of the model used herein. Performance of this conceptual model is tested against a statistical stochastic model. Hysteresis and the existence of two stable modes of the SPG circulation shape its response to forcing by atmospheric temperatures. The identification of the essential dynamics and the reduction to a minimal model of SPG variability provide a quantifiable basis and a framework for future studies on decadal climate variability and predictability. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50553
Appears in Collections: 气候变化事实与影响
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作者单位: Climate and Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland; Oeschger Centre for Climate Change Research, Bern, Switzerland; Sorbonne Universités (UPMC, Université Paris 06)-CNRS-IRD-MNHN, LOCEAN Laboratory, IPSL, Paris, France
Recommended Citation:
Born A.,Mignot J.,Stocker T.F.. Multiple equilibria as a possible mechanism for decadal variability in the North Atlantic Ocean[J]. Journal of Climate,2015-01-01,28(22)