摘要
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 and SSTA.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 to move 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 and SSTA.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 to move 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.
