Abstract
A special type of mesoscale eddy, called intrathermocline eddy or eddy lens (EL), has been studied intensively in oceanography over the past decades. The special features of the EL are (1) the deep warm core (near the sound channel axis), (2) the strong anomalies of sound speed (can be as large as 10–15 m/s), and (3) the long lifetime. The significant impact on acoustic wave propagation of EL due to these features is the ‘‘double channel’’ effect. In this paper, mode couplings caused by the ‘‘double channel’’ induced by EL is investigated. For ocean acoustic tomographic interest, modal travel time and modal dispersion are calculated by using the modal spectrum of the PE field (MOSPEF) method. Numerical simulation for a 57-Hz pulse with 10-Hz bandwidth is conducted. [Work supported by NOAA.]
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