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揭示了1968～2002年期间西北太平洋夏季平均海表温度在20世纪80年代后期经历了一次年代际变化,该年代际变化表现为西北太平洋(100°~180°E,0°~40°N)夏季海表温度经验正交分析的第一模态由频繁的负位相转变为强的正位相,该模态解释了总方差的30.5%.在1968~1987年期间,海表温度第一模态的负位相盛行(平均偏差为?0.586),相应地,负的海表温度异常占据了日本以南的西北太平洋和中国边缘海区;而1988~2002年期间,海表温度第一模态显示出强的正极性(平均偏差为0.781),因此正的海表温度异常出现在西北太平洋.伴随着夏季海表温度的年代际变化,中国南部和东南部夏季平均降水量的增加超过了40mm,达到了0.05统计显著性水平.
The results show that the mean summer surface temperature over the Northwest Pacific experienced a decadal change in the late 1980s from 1968 to 2002. The interdecadal variation of the Northwest Pacific was observed in the western North Pacific (100 ° -180 ° E, 0 ° -40 ° N) The first mode of empirical orthogonal analysis of summer sea surface temperature transforms from frequent negative phase to strong positive phase, which accounts for 30.5% of the total variance. During 1968 ~ 1987, the first mode of sea surface temperature (Average deviation is? 0.586). Correspondingly, the negative anomalies of the sea surface temperature occupy the northwestern Pacific and the marginal seas of China south of Japan. From 1988 to 2002, the first mode of sea surface temperature showed Strong positive polarity (average deviation 0.781), positive positive sea surface temperature anomalies appear in the northwestern Pacific.With the decadal variation of summer sea surface temperature, the average summer rainfall in southern and southeastern China increased by more than 40 mm 0.05 statistical significance level.