Microphysical Characteristics of Stratiform Precipitation with Embedded Convection Based on Multisource Data

Based on the ground-based microrain radar and cloud radar, combined with aircraft observation, stratiform precipitation with embedded convection is analyzed to accurately study the cloud precipitation’s microphysical structure. Results show that: (1) The selected precipitation process is divided into stratified cloud and convective cloud. Above the zero-degree layer, especially at the height of 5–6 km, the Doppler velocity and the spectrum width of convective precipitation are greater than those of stratiform cloud precipitation. This indicates that the vertical wind of the environment and the size range of the particle occurring in convective precipitation are greater than those of stratiform precipitation. (2) At the period of convective precipitation, there is a “V” glyph gap caused by the attenuation in the radar reflectivity of the cloud and microrain radars in the time and height profiles. The attenuation of the cloud radar is greater than that of the microrain radar. The higher the height, the greater is the attenuation. (3) At the period of stratiform precipitation, near the bright band, the leap increase height of the radar reflectivity factor is 80 m higher than that of the Doppler velocity, and the leap increase height of the Doppler velocity is 20 m higher than that of the spectral width. (4) The precipitation mechanism near the 0°C layer is complex. When the negative temperature is close to 0°C, the particle morphology includes radiated dendritic ice crystals, acicular ice crystals, and cloud droplets. The Doppler velocity and the spectral width of convective cloud precipitation are greater than those of stratiform precipitation above the 0°C layer, especially at altitudes of 5 and 6 km. The vertical airflow and the scale range of small and large particles in convective precipitation are greater than those of stratiform cloud precipitation.