Abstract
This work presents a measurement system designed to capture the humidity profile in the near-surface (up to 100 m) atmospheric boundary layer. The sensor array combines a portable static array of humidity sensors as well as GPS-synchronized pressure, temperature, and humidity sensors mounted to an unmanned aerial vehicle. These humidity measurements support an ongoing effort that is investigating the influence of humidity profile on acoustic ducting phenomena. These measurements will inform sensitivity studies using a numerical model being developed in a parallel effort. Preliminary measurements are presented for a range of experimental conditions such as foreshore or littoral, freshwater wetland, and dry coastal plain. The aim of this overall effort is an improved numerical model of acoustic refraction and attenuation over moderate to long distances above a sea surface that accounts for sea state as well as boundary layer wind, temperature, and humidity profiles.
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