Abstract
Acoustic modal features associated with oceanic mesoscale eddy are the basic measurements for remote sensing and inferring mesoscale eddy by using modal ocean acoustic tomography (MOAT) [Shang, J. Acoust. Soc. Am. 85, 1531–1537 (1989)]. In this talk, modal travel time perturbation caused by mesoscale eddy has been calculated by three different methods and comparison has been made. Since the linear inverse is one of the conventional inverse schemes, the nonlinearity of modal travel time perturbation has been investigated for different eddy parameters as well as different frequencies. In order to determine the validity of using the adiabatic mode theory to MOAT, some interesting results of mode coupling caused by mesoscale eddy will also be presented in this talk. [Work supported by NOAA and ONR.]
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