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| Ensemble Simulations of a Nonlinear Barotropic Model for the North Atlantic Oscillation |
| ZHANG Dong-Bin,JIN Fei-Fei,LI Jian-Ping,DING Rui-Qiang |
| LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;Graduate University of Chinese Academy of Sciences, Beijing 100049, China,Department of Meteorology, University of Hawaii at Manoa, Honolulu, Hi 96822, USA,LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China,LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China |
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Abstract A numerical ensemble-mean approach was employed to solve a nonlinear barotropic model with stochastic basic flows to analyze the nonlinear effects in the formation of the North Atlantic Oscillation (NAO). The nonlinear response to external forcing was more similar to the NAO mode than the linear response was, indicating the importance of nonlinearity. With increasing external forcing and enhanced low-frequency anomalies, the effect of nonlinearity increased. Therefore, for strong NAO events, nonlinearity should be considered.
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Received: 26 August 2010
Revised: 04 September 2010
Accepted: 04 September 2010
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