Abstract
Experimental studies of atmospheric acoustic propagation have included monitoring the level of a 27.7‐Hz source at a distance of 770 m. Two of the extended duration experiments consisted of recording SPL at 1‐min intervals for 75 h over dry ground (Oct. 1988), and for 144 h over frozen, snow‐covered ground (March 1989). Comprehensive surface layer micrometeorological measurements, including monitoring the turbulent momentum, heat, and moisture fluxes adjacent to the path, as well as continuous Doppler sodar measurements of the boundary layer wind profiles, were made. These measurements are used to reconstruct the time‐dependent “along path” sound speed profiles. Interpretation of the acoustic data includes comparisons with theoretical predictions from a fast field program (FFP).
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