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《ACTA METEOROLOGICA SINICA》 1996-06
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NUMERICAL SIMULATION OF THE ENSO CYCLE PART Ⅱ:──VARIABILITY AND TIME SCALE SELECTION MECHANISM

Yang Xiuqun (Department of Aimos pheric Sciences, Nanjing University Nanjing, Nanjing, 210093)Xie Qian (Institute of Meteordegy, P. L. A. Air force, Nanjing, 211101)  
By using a tropical Pacific coupled air-sea model with an oceanic surface boundary layer and atmospheric internal convergence feedback effect, after a long time integration of 30 years, key features of the observed multiple time scale variability of ENSO cycle have been successfully simulated. Based on the simulated results a nonlinear analog model for understanding the formation of the principal period of ENSO cycle has been established and a possible time scale selection mechanism for ENSO cycle has also been proposed. It is reported that, 1)similar to the observational facts, model ENSO cycle is truely a three time scale processes, i. e. the principal 3 ─ 4 year lower-frequency (LF) oscillation, quasi-biennial (QB) oscillation explaining the variance of 10% - 20% and annual cycle (AC); 2 ) the LF mode with 3-4 year principal period is a self-sustaining oscillation of nonlinear system. Its time scale selection results from a process of decreasing frequency and intensifying amplitude in the warm state of the QB mode, i. e. the fundamental intrinsic mode of the linear system,via the nonlinear mechanism,in which the single-way atmospheric convergence feedback appears to be mostly important to the process; 3)although the annual cycle process can not essentially influence the formation of ENSO cycle,it can notably fix the phase and modulate the amplitude. Resultantly, the individual warm/cold events in ENSO cycle appear to be partly locked to the annual cycle,and also exhibit obvious irregularity both in amplitude and in lasting time. Therefore, ENSO variability or ENSO cycle is truely due to a nonlinear interaction of multiple time scales among the LF,QB and Ac modes , in which the QB mode is a fundamental mode. The time scale selection mechanism presented in this paper is more objective to approach real world ENSO process, because it can explain not only formation of the ENSO principal period but also the spectrum of ENSO variability.
【Fund】: 国家攀登项目 国家自然科学基金
【CateGory Index】: P435
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【References】
Chinese Journal Full-text Database 1 Hits
1 Yang Xiuqun(Dept. of Atmospheric Sciences. Nanjing University. Nanjing 210008)Xie Qian(Dept. of Meteorology. Air Force Institute of Meteorology. Nanjing 211101)Huang Shiong(Dept. of Atmospherc Sciences. Nanjing University. Nanjing 210008);NSO CYCLE IN A TROPICAL COUPLED OCEAN-ATMOSPHERE ANOMALY MODEL AND ITS FORMATION MECHANISM[J];Scientia Meteorologica Sinica;1995-04
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Chinese Journal Full-text Database 3 Hits
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3 Yang Xiuqun(Department of Atmospheric Sciences. Nanjing University, Nanjing 210093)Xie Qian(Air Force Institute of Meteorology. Nanjing, 211101 );NUMERICAL SIMULATION OF THE ENSO CYCLE──Ⅰ: EVOLUTION OF HORIZONTAL STRUCTURES[J];ACTA METEOROLOGICA SINICA;1996-01
【Co-citations】
Chinese Journal Full-text Database 6 Hits
1 ZHANG Li-feng~(1,3), HE Jin-hai~1 ,XU Jian-ping~(2,3),SUN Chao-hui~(2,3) (1. Nanjing Institute of Meteorology ,Nanjing 210044,China; 2. Second Institute of Oceanograghy , SOA , Hangzhou 310012 , China ; 3. Laboratory of Ocean Dynamic Processes and Satellite Oceanograghy , SOA , Hangzhou 310012 , China);Characteristic analysis of East Asia atmospheric circulation in summers of abnormal years of the Western Pacific Warm Pool[J];Donghai Marine Science;2005-01
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3 Yang Xiuqun(Dept. of Atmospheric Sciences. Nanjing University. Nanjing 210008)Xie Qian(Dept. of Meteorology. Air Force Institute of Meteorology. Nanjing 211101)Huang Shiong(Dept. of Atmospherc Sciences. Nanjing University. Nanjing 210008);NSO CYCLE IN A TROPICAL COUPLED OCEAN-ATMOSPHERE ANOMALY MODEL AND ITS FORMATION MECHANISM[J];Scientia Meteorologica Sinica;1995-04
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5 YUE Cai-jun1,LU Wei-song2,LI Qing-quan3,LIANG Xu-dong1,DUAN Yi-hong1(1.Shanghai Typhoon Institute,Shanghai 200030,China;2.Nanjing University of Information Science & Technology,Nanjing 210044,China;3.National Climate Center,Beijing 100081,China);THE ADVANCES ON THE RESEARCH OF ZEBIAK-CANE OCEAN-ATMOSPHERE COUPLED MODEL[J];Journal of Tropical Meteorology;2004-06
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Chinese Journal Full-text Database 2 Hits
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Chinese Journal Full-text Database 1 Hits
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