Abstract
During the spring of 2009, 275‐Hz signals were transmitted over a distance of nearly 200 km from an axial source to a vertical line array with 30 elements. The source transmitted a 100‐Hz bandwidth signal every 5 min over a period of several days. This time interval is fast enough to capture the slightly slower changes in the ocean acoustic sound channel which are due to internal waves. The internal waves cause a loss of coherence over time, frequency, and space. The unique sampling of this experiment allows us to examine all three domains at once. The time coherence has not been captured in this detail in any previous experiment. Loss of coherence in these domains cause the received signal to have variations in time of arrival, phase, and intensity. These signal variations are measurable over both geometric and non‐geometric arrivals.
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