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Intelligent Identification of Convective Cloud Cores and Surrounding Stratiform Clouds

IOP Conference Series: Earth and Environmental Science, ISSN: 1755-1315, Vol: 831, Issue: 1
2021
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Conference Paper Description

Convective cloud cores and surrounding stratiform clouds in the same precipitation process were identified by Lagrange tracking method to reveal differences of cloud microphysical processes in areas with different development intensities in the same precipitation system. Firstly, a scale operator was introduced for post-processing of the tracking method to determine the height most appropriate for tracking in 3D data. Secondly, different identification thresholds were set according to the radar reflectivity factor. Regions with the factor greater than 40dBZ were defined as convective cloud cores, and those with the factor more than 20dBZ and less than 40dBZ as stratiform clouds around cores. Finally, analysis was conducted on their differences in the motion trajectory, duration and development range in a weather process. The results showed that changes in the duration and the areas of convective cloud cores and stratiform clouds reflected the intensity of microphysical processes in different regions; the microphysical process of the regions with short-duration but large-area convective cloud cores were more intense, while that of the regions with long-life and small-area cores developed more smoothly.

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