A study of the relationship of zonal wind oscillation between East Australia and northwestern Pacific tropical area

The spectral analysis of zonal wind at two stations in East Australia has been studied. It is confirmed that the oscillation with period between 40-50 days and 21-25 days do exist at both high and low levels. These oscillations are closely related with that of zonal wind with the same period over the Truk Island of the northwestern Pacific. The oscillation with a 40-50 day period over East Australia is 8-11 days earlier than that over the NW Pacific. But the oscillation with a 21-25 day period over the NW Pacific is about 3 days earlier than that over East Australia.