The effects of sound‐speed variations, produced by an assumed Rossby wave, on ray geometry, travel time, and spreading loss are investigated for an ocean region such as the Sargasso Sea. A horizontally discretized sound‐speed model is used, and a bottomed source and receiver are assumed. The phase of the total acoustic field is examined, and it is found that the major effects of the Rossby wave arise through travel‐time variations. The period of the phase is that of the Rossby wave, and a formula for maximum phase variation is presented. In an example, the Eleuthera‐Bermuda area is modeled approximately, and the total‐field phase variation is examined as a function of Rossby wave propagation direction. The phase variation and period are highly sensitive to this direction, to the choice of parameter values, and to source and receiver depth.

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