Study on interannual variations of summer sea surface temperature anomaly in the North Pacific Ocean
2006
Matsuo, N.(Tokyo Univ. of Marine Science and Technology (Japan)) | Iwasaka, N.
Dominant interannual variations of summer sea surface temperature (SST) anomaly in the North Pacific are depicted by using an empirical orthogonal function analysis for the period from 1960 through 1995. The leading mode of the empirical orthogonal function (EOF) of the summer SST has mono-pole pattern with large amplitudes in the zone between 35 N and 45 N, 150 E and 150 W. Entire region of the analysis domain shows same polarity in the leading mode. Time coefficient of the leading EOF shows decadal variation; positive extreme values are found in 1960's and 1990's while negative ones are seen from 1975 through late 1980's. In the latter period the negative extremes of the time coefficients are found during El Nino event periods but in the former periods positive extremes did not always happed during La Nina or El Nino periods. We also examined relationships between the leading EOF of the summer SST and other meteorological variables and surface heat and energy fluxes based on composite analysis.
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