资源环境科技发展态势分析平台

As a potentially effective technology for particle removal, acoustic agglomeration technology has been tested for airport defogging and weather modification. Small-scale experiments and simulation studies have shown that acoustic waves can accelerate agglomeration of droplets and aerosol particles, but this has not been confirmed by large-scale field experiments and observations. In this study, field experiments were conducted in a high-altitude and non-interference environment to investigate cloud and precipitation interference by low-frequency acoustic waves. Field tests were carried out in the source region of the Yellow River (SRYR) from July 21, 2019 to November 20, 2019. Macro- and micro- physical characteristics of cloud and precipitation in the stratiform and convective precipitation system were monitored by disdrometer, micro rain radar, and microwave radiometer. The results showed sensitivity of microphysical parameters of rain rate (R), radar reflectivity factor (Z), liquid water content (L_wc) and height of cloud base (H_c) to acoustic operation. Of these, values of R, Z, and L_wc became larger under the action of acoustic waves, and H_c values became lower with acoustic operation. Spectral parameters λ against μ, Z against R, and L_wc against R at different sampling altitudes and for different precipitation systems follow a quadratic function, power function, and linear function, respectively. The results of this study should be instructive for further efforts to study and develop atmospheric interference technology with low-frequency strong acoustic waves.