A considerable energy variability is observed for quartets of doubly bottom-reflected signals when the acoustic path crosses the frontal zone of the Gulf Stream. The experimental curves exhibit a local increase by a factor of more than two in the energy of individual bottom-reflected signals. According to the data of numerical modeling, the position and magnitude of the energy maxima prove to be highly sensitive to the position of the frontal zone, its horizontal and vertical sizes, and the values of the horizontal sound speed gradients. A conclusion is drawn that the observed phenomenon can be used as an indicator of the position of the frontal zone and as a tool for estimating its parameters.
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