Abstract
Thirty days of pulse response data collected in the August 1983 Straits of Florida acoustic reciprocal transmission experiment have been used to determine temperature and current by various inversion methods. Relative travel time data were tracked from the late peak and leading edge of unresolvable pulse responses using the centroid and the threshold-cross-time methods. From results of ray model and broad band PE model simulations, the measured travel time variations for the late peak and the leading edge were related to the modeled travel time variations of the latest arrival, which travels along the flattest ray path, and the earliest arrival, which travels along the steepest ray path. Various inversion methods, both linear and nonlinear, have been discussed and applied. Sum and difference of the experimental reciprocal travel times for the late peak and leading edge were linearly inverted to obtain the temperature and the current in the lowest layer and the upper layer of ocean. The travel time data were used in the linear and the nonlinear inversions to estimate the temperature or the sound speed profiles. Results show that the inverted temperatures, or sound speed, and current are consistent with the direct measurements.