Guan Li, Dai Jianhua, Yuan Zhaohong, Tao Lan, Yin Chunguang, Zou Lanjun. 2022. Research on dual-polarimetric radar KDP foot and ZDR arc recognition and application. Acta Meteorologica Sinica, 80(4):578-591. DOI: 10.11676/qxxb2022.047
Citation: Guan Li, Dai Jianhua, Yuan Zhaohong, Tao Lan, Yin Chunguang, Zou Lanjun. 2022. Research on dual-polarimetric radar KDP foot and ZDR arc recognition and application. Acta Meteorologica Sinica, 80(4):578-591. DOI: 10.11676/qxxb2022.047

Research on dual-polarimetric radar KDP foot and ZDR arc recognition and application

  • Differential reflectivity ( Z_\mathrmD\mathrmR ) arc is known as an arc-shaped region of high differential reflectivity along the inflow edge of the forward flank, while a down shear elongated K_\mathrmD\mathrmP maximum near the echo centerline of the storm is known as K_\mathrmD\mathrmP foot. The Z_\mathrmD\mathrmR arc and the clear horizontal separation between the areas of Z_\mathrmD\mathrmR arc and K_\mathrmD\mathrmP foot have been confirmed to be the signatures of hydrometeor size sorting within their forward flank regions in supercell storms. Recent studies have indicated that Z_\mathrmD\mathrmR arc and Z_\mathrmD\mathrmR arc- K_\mathrmD\mathrmP foot separation signatures insupercell storms may be related to environmental storm-relative helicity and low-level shear. Based on the conception model and machine learning, the recognition algorithm for K_\mathrmD\mathrmP foot and Z_\mathrmD\mathrmR arc is designed, and the separation and angle of Z_\mathrmD\mathrmR arc and K_\mathrmD\mathrmP foot are then calculated. The recognition effect and quantitative calculation are examined using S band polarimetric radar and auto weather station observations of four supercell storms occurred in East China. The results show that the recognition method introduced in this study can identity Z_\mathrmD\mathrmR arc and K_\mathrmD\mathrmP foot correctly, the variation of Z_\mathrmD\mathrmR arc- K_\mathrmD\mathrmP foot centroid distance and separation angle can indicate the occurrence of extreme gust.
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