Abstract
The backscattering cross-section during the stage of edge aggregation between two small, spherical ice particles is greater than before they make contact with each other as well as after they fuse and coalesce into a single spherical particle—especially if the aggregation and coalescence process starts from two small, spherical ice particles. Here, the possible contribution of this phenomenon to the radar bright band is studied. It is found that the backscattering cross-section of the edge-aggregated particles, in cases where the edge-aggregation direction is consistent with the direction of radar wave polarization, may be 1.5 times greater than the backscattering cross-section of an equal volume, spherical particle, though the ratio may decrease and fluctuate as the particle size increases because of resonance in large particles. Therefore, the edge aggregation of two spherical particles can effectively increase the radar reflectivity factor and promote the formation of a bright band.
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