ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Analysis of the Application of SC Dual-Polarization Radar in a Convective Weather case in Southern Yangtze River
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Abstract:
On March 21 2019, convective weather disasters in large areas occurred in the southern part of the south of the Yangtze River with kinds of disasters, and it was also the first regional severe convection case encountered after the dual-polarization transformation of the Ji'an SC Doppler radar in southern Jiangxi. Using the detection data, the distribution and evolution characteristics of the dual-polarized radar parameters are analyzed, and compared with the observation data of cloud-to-ground flashes(CGs), the differences in performance characteristics between short-term heavy rain and windy-hail are explored. The results show that in this case the increase of the horizontal reflectivity Z_H and the differential reflectivity Z_DR at low elevation angle are significantly ahead of the change of ground rainfall, while the changes of CGs frequency are more advanced, over 6-min earlier than Z_H and about 5-10 min earlier than Z_DR. The peak time of KDP lags behind lightning On March 21 2019, convective weather disasters in large areas occurred in the southern part of the south of the Yangtze River with kinds of disasters, and it was also the first regional severe convection case encountered after the dual-polarization transformation of the Ji'an SC Doppler radar in southern Jiangxi. Using the detection data, the distribution and evolution characteristics of the dual-polarized radar parameters are analyzed, and compared with the observation data of cloud-to-ground flashes(CGs), the differences in performance characteristics between short-term heavy rain and windy-hail are explored. The results show that in this case the increase of the horizontal reflectivity Z_H and the differential reflectivity Z_DR at low elevation angle are significantly ahead of the change of ground rainfall, while the changes of CGs frequency are more advanced, over 6-min earlier than Z_H and about 5-10 min earlier than Z_DR. The peak time of KDP lags behind lightning for about 15 minutes, which can helps to predict the evolution trend of ground rain intensity about this process. During the windy-hail process, the moment when Z_H begins to increase is about 15 min before the ground sag, and the other polarizations advance earlier. At the same time, CGs increase rapidly when hail occur. These have a good indication for hail predictions about this process. This paper also explores the relationship between the precipitation value M of ice particles and hail. It is found that it surges 15 minutes ahead of falling to the ground, and the higher the altitude, the earlier the M peak appears, which could provide reference for predicting the possibility moment of hail.
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