Ocean acoustic tomography based on adiabatic mode theory

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Abstract
A new method of ocean acoustic tomography is developed on the basis of adiabatic normal‐mode theory. It is a full‐wave method suitable for low frequency in a slowly varying range‐dependent waveguide. The modal phase difference perturbations are proposed as data for inverting the sound‐speed profile perturbation for a continuous‐wave (cw) source. The modal travel time perturbations are proposed as data for a pulse source. It is shown that the ‘‘normalized depth structure,’’ as well as the ‘‘range‐averaged strength parameter’’ (defined as the product of the effective horizontal scale and the maximum sound‐speed perturbation), can be retrieved from the vertical slice modal tomography. A simulation example of inversion is presented to verify the basic ideas.

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