THE EFFECT OF THE ANOMALOUS STATE OF OCEAN AND ATMOSPHERE ON THE FREQUENCY OF TYPHOONS OVER THE WESTERN PACIFIC

It has been pointed out by analysis of data covered 33 years (from 1951 to 1983) that the effect of the anomalous thermal state of the equatorial Eastern Pacific on the frequency of typhoon over the Western Pacific is obvious. El Nino event in 1982-1983 indicated: by meridional cell, the anomalous SST (sea surface temperature) can affect the interaction between middle and low latitudes circulation, which restricted typhoon activities over the Western Pacific. In other words, when warm water occured in the equatorial Eastera Pacific, Hadley cell was intensified, which resulted in westerlies intensified and baroclinic disturbances eztends southward. As a result, subtropical high stayed in tropics and easterly flow prevailed in low latitude of Northern Hemisphere, which resulted in unfavourable situation of typhoon activities.