太平洋海浪场时空特征分析

Spatial-temporal variation analysis of sea wave field in the Pacific Ocean

为了深入了解太平洋海浪场特别是涌浪场的时空分布特征，利用44a（1958～2001年）ERA．40海浪再分析资料对南、北太平洋风浪和涌浪的波高和波向进行了统计分析，结果表明：北太平洋海浪场比南太平洋具有更明显的季节变化特征，四季中南太平洋涌浪均有明显的越赤道北传过程。南、北半球西风带海浪波高随时间呈线性增长趋势，且涌浪分别存在2．4～3．7a和2．9a左右的显著周期，风浪和混合浪波高存在6．5a和5．2a的共同周期。

The seasonal characteristics of wave field in the Pacific Ocean from the year 1958 to 2001 were analyzed with ERA-40 wave data obtained from ECMWF. The seasonal variations of significant wave height and wave di- rection in the north Pacific Ocean were more salient than those in the south Pacific Ocean. The wave height grew linearly with trend line of linear regression between the westerlies of the southern and northern hemispheres. According to the spectral analysis of swell and the overall significant wave height in the Pacific Ocean, the northern and southern hemispheres changed periodically and had equal cycle lengths. The cycle lengths were about 6.5 years and 5.2 years, about 2.4-3.7 years and 2.9 years （wind sea） in the southern and northern hemispheres, respectively.