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Based on the baroclinic semi-geostrophic model,the effects of zonally symmetrical Ekman-CISK mechanism on the characteristics of 30—60-day low frequency oscillation(LFO)near theequator are investigated.It is found that the theoretical results are in good agreement with theobservational features of LFO.Besides,the planetary-scale LFO with the period of 30—60 d couldbe triggered by the Ekman-CISK mechanism,and the growth rate of perturbation with wavenumber 1 is in order of O (10~(-6)s~(-1)).The zonal propagation of LFO and the correspondinglongitudinal-height structure of physical quantities are also discussed in detail.
Based on the baroclinic semi-geostrophic model, the effects of zonally symmetrical Ekman-CISK mechanism on the characteristics of 30-60-day low frequency oscillation (LFO) near the equator are investigated. It is found that the theoretical results are in good agreement with theobservational features of LFO.Besides, the planetary-scale LFO with the period of 30-60 d couldbe triggered by the Ekman-CISK mechanism, and the growth rate of perturbation with wavenumber 1 is in order of O (10 ~ (-6) s -1). The zonal propagation of LFO and the corresponding longitudinal-height structure of physical quantities are also discussed in detail.