Activities of low-frequency waves in the tropical atmosphere and enso |
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Authors: | Li Guilong Li Chongyin |
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Institution: | LASG, Institute of Atmospheric Physics, CAS, Beijing 100080,LASG, Institute of Atmospheric Physics, CAS, Beijing 100080 |
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Abstract: | ENSO, particularly the occurrence of ENSO is still an important research object in climatic variation. Using the ECMWF data, the relationship between ENSO and the activities of low-frequency waves in the tropical atmosphere is analyzed in this paper. It is shown that the occurrence of ENSO is closely related to the intraseasonal oscillation and the quasi-stationary waves (the period > 90 days) in the tropical atmosphere. Associated with the occurrence of El Nino event, the kinetic energy of low-frequency waves has obvious variation: the kinetic energy of atmospheric intraseasonal (30–60 days) oscillation (ISO) decreases abruptly and the kinetic energy of quasi-stationary waves increases abruptly. Moreover, the ISO and quasi-stationary waves propagate eastward clearly corresponding to El Nino; but they clearly propagate westward in La Nina cases. |
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Keywords: | Intrascasonal oscillation El Nine / Southern Oscillation Quasi-stationary wave |
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