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Laboratory of Ocean Dynamic Processes and Satellite Oceanography of State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Institute of Fluid Dynamics, Zhejiang University, Hangzhou 310027, China1. Laboratory of Ocean Dynamic Processes and Satellite Oceanography of State Oceanic Administration, Hangzhou 310012, China
2.
Laboratory of Ocean Dynamic Processes and Satellite Oceanography of State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
3.
Institute of Fluid Dynamics, Zhejiang University, Hangzhou 310027, China
The sound velocity field in a sea area near the Ry ky-gunt is stuidied by accessing generalized digital environm entalmodel data base.The distribution rules about the depth corresponding to the minmial sound velocity value are analyzed particularly.Profile a long the Guntu A rchipelago and profile across Amami-shot are studied to find out the above characteristic variations of them.There are series of conclusions.First,there is a sea area about the north of the Hangzhou Bay coaswtise area where the minmial sound velocity value always appears on the sea sur-face in winter,spring and autumn and steady surface sound channel exists.Along the coast of Zhejiag and Fujian Province,China,in the range of 30 m topography isoline,the minmial sound velocity value appears on the sea surface in summer.Second,seawater mixed very strongly and ascendant flow stood out in the 130 km range of the eastern Okinawa-shot.It lead to that the minmial sound velocity depth value in winter and summer is 400 m greater than that in spring and autumn.
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