The results of sound propagation through the warm mesoscale eddy in the region of Kuroshio in the Northwest Pacific are presented. This eddy was located inside the frontal zone separating cold subarctic and warm subtropical waters. The eddy core lied at a point about 39°N, 149°E. Horizontal size of the eddy was about 350 km, vertical size was about 600 m. Such eddies are called synoptic or mesoscale eddies. Continuous acoustic signals at the frequencies of 232 Hz and 696 Hz were emitted by the sources towed at the depth of 100 m along different traces in accordance with removal from the receiver point to the maximum distance of about 430 km. Signals were received using the drifting system fitted with hydrophones at different depth from 100 m to 1000 m. One of the receiving systems was located in the core of the eddy, another out of the core. In addition, the measurements of acoustic signals were obtained at different received points at the distance of about 430 km when the power acoustic source changed its depth from 100 m to 800 m. The influence of such eddies on sound propagation was shown. The results of experimental measurements were compared with the calculations of the acoustic field.
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