北太平洋海温变化的年代际模及其演变特征

Interdecadal Modes of Sea Surface Temperature in the North Pacific Ocean and Its Evolution

用近百年的海温 (SST)资料 ,分析研究了北太平洋海温的年代际变化特征及其基本形势 (模态 )。结果表明 ,它主要存在准 7～ 1 0年周期和准 2 5～ 35年周期两类年代际变化 ;这两类年代际变化又都有类似的形势 (模态 ) ,但却与所谓“类ENSO模”明显不同。同时 ,两个年代际模都有呈西北—东南向振荡和沿海盆作顺时针旋转的共存活动 (演变 )特征。

The feature and basic patterns of interdecadal variation of sea surface temperature (SST) in the North Pacific are studied by using about 100 years SST data from Hadley Center. The results show that there are two kinds of interdecadal variations, i e ., 7～10 years period and 25～35 years period variations. These two modes have similar pattern, but it is different from the 'ENSO\|like mode' obviously. The analyses show further that the NW\|SE oscillation and the clockwise rotation are coexistent feature of these interdecadal modes.