热带太平洋风应力距平场的主振荡型分析

利用FSU（Florida State University）风应力逐月资料，运用POP方法，分析了热带太平洋地区风应力异常场结构与ENSO的联系。结果显示：纬向风应力有35、47和57月周期的传播型振荡；经向风应力有28和38月周期的传播型振荡。得到纬向、经向风应力传播型与ENSO振荡的耦合关系。同时指出，对El Nino／La Nina这样的大尺度海气相互作用现象的时空演变，应注重多种振荡混合的作用，而不应只分析单一模态的作用。风应力异常的局地振荡对El Nino／La Nina的影响也不应忽视。

POP Analysis of Wind Stress Anomalies in the Tropical Pacific Ocean

Based on the FSU(Florida State University)monthly analysis data of wind stress,typical wind stress patterns associated with the El Nino/La Nina are determined with the technique of POP(Principal Oscillation Pattern) analysis.The results show that the oscillations of zonal/meridional wind stresses have the periods of 35,47,57 months/28,38 months,respectively.We also found the coupled relations between zonal/meridional wind stress propagating patterns and ENSO oscillations.It is suggestive that the explanation,simulation and prediction of El Nino/La Nina spatial/temporal evolution should not be based on a single eigenmode but on their interaction,with emphasis on the fact that superimposition and phase locking are important factors for the event cycle.Finally,the authors suggest that the local oscillation is worthy of consideration too.