SUMMER TIME CHARACTERISTICS AND CORRELATION OF THE EXTRATROPICAL 500 HPA GEOPOTENTIAL HEIGHT FIELD AND SEA SURFACE TEMPERATURE

The R otated Principle Component (RPC) technic was employed to analyze the spatialand temporal characteristics of the summer time geopotential height field at 500 hPa and the sea surface temperature anomaly (SSTA) in the Northern Hemisphere by using the 40 a observation data ranging from 1949 to 1988.Their correlation was also studied by using cross correlation technic. Results form these study show that,the majoranomaly patterns of the summer time 500 hPa geopotential height are the subtropical (ST) pattern,the polarand American (PA) pattern,the four wave (FW) pattern,and the three wave (TW) pattern.The major spatial patterns of the summer time SST A over the North Pacific are the easter nequatorial Pacific (EEP),the Bay of Alaska (BAL),the central tropical Pacific (CTP), and the northern North Pacific (NNP) patterns.Whereas those over the North Atlantic are the equatorial Atlantic (EAL),the Caribbean Sea (CAR),the eastern North Atlantic (ENA),and the central North Atlantic (CNA) patterns.