Analysis of sound channel distribution characteristics in the Japan Sea based on WOA23
This paper is based on the WOA23 thermohaline profile dataset,and utilizes empirical formulas for sound velocity to calculate the sound speed profile in the Japan Sea.According to the characteristics of sound speed profile and sound speed gradient,the characteristic information of surface sound channel and SOFAR channel in the Japan Sea is diagnosed and extracted,and then study the regional distributions and seasonal characteristics of the surface sound channel and the SOFAR channel.The results indicate that surface sound channels in the Japan Sea are significantly influenced by seasonal variation and exhibit distinct regional distribution characteristics.During the spring and summer,there is almost no surface channel in the entire region.However,during the fall and winter,surface sound channels are substantially generated,which are primarily distributed in the sea area near the eastern border of East Korea Bay and the Japan Sea.Compared with the fall,the distribution area of the surface sound channel decreases at the north and south ends during the winter.However,the distribution area of the surface acoustic channel in the East Korea Bay and the sea area between 40°N and 50°N further expands.In fall,the thickness of the surface channel is basically less than 40 m,while in winter,the thickness of the surface sound channel increases as a whole,especially in the sea area between 44°N and 50°N,where most of the surface sound channel thickness exceeds 100 m.The seasonal variation of the surface channel gradient is relatively small,except for the surface sound channel near the Tartary Strait in autumn,where the gradient is greater than 0.2 s-1.For the majority of the surface sound channels,the gradient is less than 0.05 s-1.Compared to the surface sound channel,the SOFAR channel is less affected by seasonal variations and exhibits a more stable sound channel effect.Moreover,the depth of the axis is generally shallower than 450 m,and the sound speed along the channel axis ranges from 1 456 to 1 468 m·s-1,gradually decreasing from southeast to northwest.
NETL
NSTL
万方数据
