Variation of sea surface temperature in North Pacific Ocean since early 1980s

Based on the sea surface temperature(SST) in the North Pacific Ocean from 1979.1 to 2006.12 a detailed analysis is made by means of the statistic methods such as unitary linearity regression method and power spectrum.The results show that 1) There are seven regions over that SST changes remarkably: near Japanese sea,east of the Chinese mainland,the middle of Pacific Ocean near 30oN,the middle of Pacific Ocean near 45oN,west of Coast Range in North America,west of Mexico and the Middle and East Equatorial Pacific.2) SST over the west and middle of Pacific Ocean is increasing,most quickly over Japanese sea and east of the Chinese mainland.Except for the center of SST the increase in winter is over east of the Chinese mainland;the others are all in summer and autumn,especially since the early 1990s.The SST over west of Coast Range and the Middle and East Equatorial Pacific decrease,but more slowly.3) The Middle and East Equatorial Pacific possesses the variation periods of 5a and 3.5a while there is about 5-6a and 14a periodicity over the middle of Pacific Ocean near 30oN.4) Years of both maximum and minimum SST are consistent with that of El Nino and La Nino in most regions except the mid-latitude Pacific where the maximum appears in the late 1990s and early 2000s and minimum appears in years of El Nino.