@article{GUAN2022, 
author = {Li GUAN and Jianhua DAI and Zhaohong YUAN and Lan TAO and Chunguang YIN and Lanjun ZOU},
title = {Research on dual-polarimetric radar KDP foot and ZDR arc recognition and application},
year = {2022},
journal = {Acta Meteorologica Sinica},
volume = {80},
number = {4},
pages = {578-591},
keywords = {ZDR arc, KDP foot, Centroid distance, Separation angle},
url = {https://www.sciopen.com/article/10.11676/qxxb2022.047},
doi = {10.11676/qxxb2022.047},
abstract = {Differential reflectivity (ZDR) 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 KDP maximum near the echo centerline of the storm is known as KDP foot. The ZDR arc and the clear horizontal separation between the areas of ZDR arc and KDP 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 ZDR arc and ZDR arc-KDP 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 KDP foot and ZDR arc is designed, and the separation and angle of ZDR arc and KDP 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 ZDR arc and KDP foot correctly, the variation of ZDR arc-KDP foot centroid distance and separation angle can indicate the occurrence of extreme gust.}
}