利用中国第5次北极科学考察CTD数据，分析了白令海夏季声速剖面结构特征。对比Chen-Millero、Delgrosso、Wilson 3种声速计算方法，其中Chen-Millero方法计算的声速值居中。将白令海夏季声速剖面结构总结为5类。其中白令海盆区域，受次表层低声速水团影响，夏季声速从表层向下先减小后增大，双跃层结构明显，南北差异较大，主声跃层位于133~200 m，强度在0.38 S-1左右，季节跃层强度约为-0.77 S-1；海盆向陆架过渡区域，声速水平变化剧烈；白令海峡以南受不同性质海流的影响，西南部声速比东南部小、跃层强，强度分别为-2.4 S-1、-2.0 S-1；9月份陆架海区表层声速开始减小，从表层向下声速先减小后增大。%Basedonthe surveying conductivity-temperature-depth (CTD) data by Chinese FifthArctic Research Expedition, the analysis of the characteristics of sound speed profiles structure in Bering Sea is conducted. By comparing three sound speed calculation methods of Chen-Millero、 Delgrosso and Wilson, the results of Chen-Millero is testified to be moderate. The sound speed profiles in Bering Sea are classified into 5 species. The Bering Sea basin is influenced by the low sound speed water mass in the subsurface layer, the sound speed value decreases first, and then increases in summer. Moreover, the double thermocline phenomena is obvious, and the difference between north and south is very apparent. Permanent thermocline exists in 133~200 m, the average intensity of which is 0.38 S-1. And the intensity of seasonal thermocline is about-0.77 S-1. In the transition zone from basin to shelf, the sound speed changes rapidly;The sound speed in the southwest of the Bering Strait is higher than in the southeast with the effects of different currents. However the intensity of thermocline is quite the contrary, which are-2.4 S-1 and-2.0 S-1, respectively. The sound speed firstly decreases in the surface layer of the shelf, and then increases downwards.
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