Abstract
Acoustic propagation along the Hawaii–Aleutain path of ATOC has been investigated based upon two ocean models: (1) Levitus annual mean data on a 1-deg grid and (2) Semtner–Charvin’s model of one realization (Feb.) with 1/2-deg resolution. The adiabaticity has been evaluated by using four indicators: (a) adiabatic travel time discrepancy, (b) modal repopulation, (c) modal dispersion, and (d) mode-coupling matrix. It is found that significant mode coupling takes place at the sub-Arctic front area (N-44.8°) in Semtner–Charvin’s model but not in Levitus model because Semtner–Charvin’s model gives a much stronger double channel at that area than Levitus data. [Work supported by ARPA and NOAA.]
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