Spatial-temporal variation analysis of sea wave field in the Pacific Ocean
太平洋海浪场时空特征分析

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 direction 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.