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THE EXCITING MECHANISM OF TROPICAL INTRASEASONAL OSCILLATION TO EL NINO EVENT

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  • The data analyses indicated that the occurrence of EL Nino event is closely related to intraseasonal oscillation (ISO) in the tropical atmosphere: The intraseasonal oscillation is very strong in tile tropics (particularly over the equatorial western Pacific) prior to the occurrence of El Nino; But the ISO is evidently reduced and the quasistationary system is enhanced after the outbreak of El Nino. A simple air-sea coupled model study shows that the periodical self-excited oscillation can be produced in the air-sea-coupled system, but the pattern is different from the observed ENSO mode. When there is external (atmospheric) forcing with interannual time scale, a coupled mode, which looks like the ENSO mode, will be excited in the air-sea system. Synthesizing the results in data analyses and the theoretical investigation. the mechanism of ISO in the tropical atmosphere exciting the El Nino event can be suggested : The interannual anomalies (variations) of the tropical ISO play an important role in the exciting El Nino event through the air-sea interaction.
  • [1] Barren T N.. Latif M Kirk C, Rocckner G, 1991.On ENSO physic, J. Clinrale, 4: 48-515.
    [2] Battistic G, Sarackik L. Understanding and predicting ENSO. Reviews of Geophysics. U.S. National Report to IUGG(1991-1994), 1367-1376
    [3] Battisti D.A. Hirst A.C. 1989. Interannual variability in a tropical atmosphere-ocean model: intluence of the basic state ocean geometry and nonlinearity, J Atmos. Sci., 46:1687-1712.
    [4] Gill A E. 1980Some simple solution of heat induced tropical circulation, Q.J.R. Meteor. Soc.. 106: 447-462.
    [5] Latif. M. Barrett T P, Cane M A et al.1994. A review of ENSO prediction studies, Climate Dvnarnics, 9: 167-179.
    [6] Lau. K M. Peng L.1986. The 40-50 day oscillation and the El Nino/Southern Oscillation:A new perspective.Bull..amer Afeleor Soc,67: 533-534.
    [7] Li Chongym. Zhou Yaping, 1994. Relationship between intrascasonal oscillation in the tropical atmosphere and ENSO, Chinese Journal of Geophvsics, 37: 213-224.
    [8] Li Chongyin. Li Guilong, 1991. Energy variations of tropical atmospheric systems associated to the occurrence of El/Nino, Chinese Science Bulletin, 40: 1866-1870.
    [9] Li Chongyin. 1995. Introduction to Climate Dynamics (in Chinese), Beijing: China Meteorological Press. 461.
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Li Chongyin, Liao Qinghai. THE EXCITING MECHANISM OF TROPICAL INTRASEASONAL OSCILLATION TO EL NINO EVENT [J]. Journal of Tropical Meteorology, 1998, 4(2): 113-121.
Li Chongyin, Liao Qinghai. THE EXCITING MECHANISM OF TROPICAL INTRASEASONAL OSCILLATION TO EL NINO EVENT [J]. Journal of Tropical Meteorology, 1998, 4(2): 113-121.
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Manuscript History

Manuscript received: 17 March 1997
Manuscript revised: 23 June 1997
通讯作者: 陈斌, bchen63@163.com
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THE EXCITING MECHANISM OF TROPICAL INTRASEASONAL OSCILLATION TO EL NINO EVENT

Abstract: The data analyses indicated that the occurrence of EL Nino event is closely related to intraseasonal oscillation (ISO) in the tropical atmosphere: The intraseasonal oscillation is very strong in tile tropics (particularly over the equatorial western Pacific) prior to the occurrence of El Nino; But the ISO is evidently reduced and the quasistationary system is enhanced after the outbreak of El Nino. A simple air-sea coupled model study shows that the periodical self-excited oscillation can be produced in the air-sea-coupled system, but the pattern is different from the observed ENSO mode. When there is external (atmospheric) forcing with interannual time scale, a coupled mode, which looks like the ENSO mode, will be excited in the air-sea system. Synthesizing the results in data analyses and the theoretical investigation. the mechanism of ISO in the tropical atmosphere exciting the El Nino event can be suggested : The interannual anomalies (variations) of the tropical ISO play an important role in the exciting El Nino event through the air-sea interaction.

Li Chongyin, Liao Qinghai. THE EXCITING MECHANISM OF TROPICAL INTRASEASONAL OSCILLATION TO EL NINO EVENT [J]. Journal of Tropical Meteorology, 1998, 4(2): 113-121.
Citation: Li Chongyin, Liao Qinghai. THE EXCITING MECHANISM OF TROPICAL INTRASEASONAL OSCILLATION TO EL NINO EVENT [J]. Journal of Tropical Meteorology, 1998, 4(2): 113-121.
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