通过对WOA13数据库季节平均数据的分析依次得到锋区内0~1 000 m各层锋轴线的位置,对马海流锋轴线位置由表层的40°N附近随深度增加逐渐南移到39°N附近且位置的季节摆动幅度增大.利用绝对梯度方法对温度锋强度与盐度锋强度的水平分布及垂直变化进行了分析;对比了四季锋强度的差异以及差异比率,得到了不同深度不同季节锋强度强弱分布的规律.对比声速穿过锋线时的差异认为表面声速从南到北逐渐减小,锋轴线南北两侧声速差异主要集中在150 m以内,且随深度增加声速差异减小.此外,还运用BELLHOP模型对锋区内700 m以浅的声道特点以及声传播损失进行了简单分析.
By analyzed WOA13 season average data the positions of front axis at each level of 0 -1 000 m depth in- side the front zone were extracted. It showed that the Tsushima current front axis positioned by 40° N near the sur- face increased with depth moved gradually southward to the position near 39° N where the seasonal variations in- creased. By the analyses of vertical and horizontal variations of thermal front and salinity front intensities and by the comparison of velocities in the front surface and of the velocity differences, the distribution characters of front axis intensity in different depths of 4 seasons were obtained. It is found that the surface sound velocity crossing the front axis decreased gradually from south to north. The velocity differences in the south and north sides of front axis mainly concentrated in the depth less than 150 meters and the gaps decreased with the depth. Besides, the BELL-HOP model was used to analyse primarily the channel characters and the sound transmission loss in the front area to depths of 700 meters.
Journal of Oceanography In Taiwan Strait