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Composite investigation is performed of global dynamic characteristics of >3—4-year period low-frequency oscillation in ENSO variability of air-sea coupling in the context of monthly mean wind andSSTA.Evidence suggests that the horizontal(vertical)anomaly circulation at tropical latitudes(equatorial)exhibits their evolution to be,in substance,a kind of low-frequency wave slowly travel-ling eastward,featured by wave number 2 moving along the equator and zonal wind swiftly decayingoff the equator in relation to divergence/convergence:the time that the low-frequency wave takes tomove around the equator in its halfway is precisely the period of the ENSO low-frequency component(LFC)(approximately 4 years);the ocean also displays corresponding response to the component.
Composite investigation is performed of global dynamic characteristics of> 3-4-year period low-frequency oscillation in ENSO variability of air-sea coupling in the context of monthly mean wind andSSTA. Evidence suggests that the horizontal (vertical) anomaly circulation at tropical latitudes (equatorial) exhibits their evolution to be, in substance, a kind of low-frequency wave slowly travel-ling eastward, featured by wave number 2 moving along the equator and zonal wind swiftly decaying off the equator in relation to divergence / convergence: the time that the low-frequency wave takes tomove around the equator in its halfway is precisely the period of the ENSO low-frequency component (LFC) (approximately 4 years); the ocean also displays corresponding to the component.