南海海底地势复杂,海域内跃层分布有其特殊性,研究声速跃层分布形态对海上军事活动和海洋战场建设有重要影响。利用50 a(1958~2007年)SODA (simple ocean data assimilation)月平均资料,采用垂直梯度法分别求得3种类型声速跃层的特征值。结果表明：冬季,3种类型声速跃层范围全年最小,厚度最薄,强度最弱；夏季,主跃层、双跃层范围全年最大,厚度最厚,深度大都较浅,强度最强。春秋季跃层的示性特征介于冬夏之间,秋季比春季变化明显。%The distribution of the sound velocity spring layer has important influence on military activities and ocean battlefield construction. The distribution form of the Sound velocity spring layer has its particularity due to the complicated seafloor topography in the South China Sea (SCS). Based on the monthly data of simple ocean data assimilation (SODA) during the past 50 years (1958-2007), the eigenvalue of three types of sound velocity spring layers in the SCS was calculated by using the vertical gradient method. The results show that all the three types of spring layers had maximum range, and minimum thickness and intensity values in winter. On the contrary, the main spring layers and double spring layers were vastest, shallowest, thickest and strongest in summer. The characteristics of three spring layers in autumn changed significantly than that in spring.
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