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利用多通道奇异谱分析(MSSA)等多尺度分析方法,对西北太平洋海区14个站位验潮序列的年际到十年际尺度海面波动的时空特征进行探讨。结果表明:2.5a周期和4.5a周期在振幅与相位上表现出与ENSO指数波动的尺度耦合,并存在显著的由低纬向高纬的振幅、能量递减的纬向传递特征。4.5a周期和8a周期与PDO变化同样表现出一定的尺度耦合波动,高纬各站位海面波动也表现出一定的自东向西的径向传递。在空间维上,PDO作用下的传播型波动的响应范围明显小于ENSO事件,反映了二者驱动机制的差异。该海区约在1973年和1998年左右发生过两次明显的海面波动转型,并与太平洋年代际涛动(PDO)存在一定关联。
Using multichannel analysis of multichannel singular spectrum analysis (MSSA) and other multiscale analysis methods, the spatio-temporal characteristics of annual sea-level fluctuations in the tidal range of 14 stations over the western North Pacific Ocean are discussed. The results show that the 2.5a cycle and the 4.5a cycle exhibit scale-like coupling with the ENSO index in amplitude and phase, and there are significant zonal and energy decreasing latitudinal transfer characteristics from low latitude to high latitude. The 4.5a cycle and the 8a cycle exhibit the same scale coupling fluctuation as the PDO change, and the fluctuation of sea surface at each station in the high latitudes also shows a certain radial transmission from east to west. In spatial dimension, the response range of the propagating fluctuation under PDO is obviously smaller than that of ENSO, reflecting the difference of the driving mechanism between the two. There were two obvious sea-level transitions that took place around 1973 and around 1998 in the area, and were associated with the Pacific Decadal Oscillation (PDO).