Airborne Insects as Potential Sources of Acoustic Reflectivity

J. R. Riley Natural Resources Institute Radar Unit, Great Malvern, United Kingdom

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A. S. Edwards Natural Resources Institute Radar Unit, Great Malvern, United Kingdom

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Abstract

Laboratory measurements of the acoustic backscattering cross sections of a variety of insects at 3.4 kHz are reported. The authors argue from these data, and from what is known (from radar studies) about insect concentrations in the lower atmosphere, that acoustic returns from insects may seriously contaminate sodar data. They suggest that this possibility should be carefully considered when interpreting backscatter coefficient data acquired in acoustic sounding experiments.

Corresponding author address: Dr. J. R. Riley, NRI Radar Unit, North Site, Leigh Sinton Rd., Great Malvern, Worcestershire WR14 ILL, United Kingdom.

Email: joe.riley@nri.org

Abstract

Laboratory measurements of the acoustic backscattering cross sections of a variety of insects at 3.4 kHz are reported. The authors argue from these data, and from what is known (from radar studies) about insect concentrations in the lower atmosphere, that acoustic returns from insects may seriously contaminate sodar data. They suggest that this possibility should be carefully considered when interpreting backscatter coefficient data acquired in acoustic sounding experiments.

Corresponding author address: Dr. J. R. Riley, NRI Radar Unit, North Site, Leigh Sinton Rd., Great Malvern, Worcestershire WR14 ILL, United Kingdom.

Email: joe.riley@nri.org

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