当前位置： 首页»科研成果» 2014 李建平与合作者在CLIMATE DYNAMICS上发表论文 全球院

A delayed oscillator model for the quasi-periodic multidecadal variability of the NAO

 

Cheng Sun^1,2 Jianping Li^1,3 Fei-Fei Jin⁴

 

1 College of Global Change and Earth System Science (GCESS), Beijing Normal University, Beijing 100875, China

2 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China

3 Joint Center for Global Change Studies, Beijing 100875, China

4 Department of Meteorology, University of Hawaii at Manoa, Honolulu, HI 96822, USA

 

ABSTRACT

Wavelet analysis of the annual North Atlantic Oscillation (NAO) index back to 1659 reveals a significant frequency band at about 60 years. Recent NAO decadal variations, including the increasing trend during 1960–1990 and decreasing trend since the mid-1990s, can be well explained by the approximate 60-year cycle. This quasi60-year oscillation of the NAO is realistically reproduced in a long-term control simulation with version 4 of the Community Climate System Model, and the possible mechanisms are further investigated. The positive NAO forces the strengthening of the Atlantic meridional overturning circulation (AMOC) and induces a basin-wide uniform sea surface temperature (SST) warming that corresponds to the Atlantic multidecadal oscillation (AMO). The SST field exhibits a delayed response to the preceding enhanced AMOC, and shows a pattern similar to the North Atlantic tripole (NAT), with SST warming in the northern North Atlantic and cooling in the southern part. This SST pattern (negative NAT phase) may lead to an atmospheric response that resembles the negative NAO phase, and subsequently the oscillation proceeds, but in the opposite sense. Based on these mechanisms, a simple delayed oscillator model is established to explain the quasi-periodic multidecadal variability of the NAO. The magnitude of the NAO forcing of the AMOC/AMO and the time delay of the AMOC/AMO feedback are two key parameters of the delayed oscillator. For a given set of parameters, the quasi 60-year cycle of the NAO can be well predicted. This delayed oscillator model is useful for understanding of the oscillatory mechanism of

the NAO, which has significant potential for decadal predictions as well as the interpretation of proxy data records.

 

KEY WORDS: North Atlantic Oscillation, Atlantic multidecadal variability, Atlantic meridional overturning circulation, Delayed oscillator model

 

PUBLISHED BY: Clim Dyn., 2015, online, DOI:10.1007/s00382-014-2459-z

 

SOURCE: http://link.springer.com/article/10.1007/s00382-014-2459-z