Abstract
The results of acoustic tomographic monitoring of the coherent structures in the lower atmosphere and the effects of these structures on the acoustic signal parameters (travel time, duration and direction of propagation) are studied. From the measurements of acoustic travel time fluctuations (periods 1 min-1h) by a net of distanced receivers the temporal fluctuations of the effective sound speed are retrieved along different ray paths connecting a pulse source and the receivers. By using a coherence analysis of the fluctuations near spatially distanced ray turning points, the internal wave-associated fluctuations are filtered and their spatial characteristics (coherences, horizontal translation velocities, and spatial scales) are obtained. A possible explanation of the presence of the dominant periods in the observed mesoscale variations of the acoustic parameters, wind shears and turbulent fluxes of momentum near ground is done.
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