Abstract
We compute accurate maps of oceanic fluctuations affecting transient acoustic signals propagating between a source and receiver. The technological advance involves coupling the One-Way Wave Equation (OWWE) propagation model with the theory for the Differential Measure of Influence (DMI). This theory uses two finite-frequency solutions of the linear acoustic wave equation: from source to receiver and vice versa. They must obey reciprocity. OWWE satisfies reciprocity with great accuracy even at basin-scales when the field of sound speed varies horizontally and vertically. At infinite frequency, maps of the DMI collapse into infinitely thin rays. Mapping the DMI is useful for understanding measurements of the amplitude and travel time changes of sound at finite frequencies. [Work supported by ONR contracts N00014-12-C0230 and N62909-12-1-7033.]
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