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据1962~1980年逐月平均表面似风应力资料,用调和分析及功率谱分析等方法分析了热带西太平洋表面风场的季节变化和年际变化。结果表明,该海区表面风场的季节变化,主要与热带辐合带(ITCZ)的季节位移有关,其年际变化则有明显的与埃尔尼漆南方涛动现象(ENSO)相对应的变化。且表面风场通常比ENSO有超前的异常变化。文中还初步探讨了表面风场变化对海洋次表层热结构的影响.结果表明,表面风应力涡度引起的埃克曼抽吸作用(Ekmanpumping)可近似解释该海区温跃层深度的平均季节变化。该海域赤道附近表面纬向风应力的变化与西太平洋暖水区体积变化之间有较密切的关系。
According to the monthly average wind-induced wind stress data from 1962 to 1980, the seasonal variation and interannual variation of the surface wind field over the western tropical Pacific are analyzed by harmonic analysis and power spectrum analysis. The results show that the seasonal variation of the surface wind field in the sea area is mainly related to the seasonal displacement of the ITCZ, and the interannual variation has obvious changes corresponding to the El Ni 漆 Southern Oscillation (ENSO) . And the surface wind field usually has an anomalous change ahead of ENSO. In the paper, the influence of surface wind on the subsurface thermal structure is also discussed. The results show that Ekman pumping caused by surface wind vorticity can explain the average seasonal variation of the thermocline depth in this sea area. There is a close relationship between the change of zonal wind stress near the equator and the volume change of the western Pacific warm water.