刁秀广,郭飞燕. 2021. 2019年8月16日诸城超级单体风暴双偏振参量结构特征分析[J]. 气象学报, (0):-, doi:10.11676/qxxb2021.010
2019年8月16日诸城超级单体风暴双偏振参量结构特征分析
Analysis of the Polarimetric Signatures in Zhucheng Supercell Thunderstorm on 16 August 2019
投稿时间:2020-08-27  修订日期:2020-10-26
DOI:10.11676/qxxb2021.010
中文关键词:  超级单体  双偏振参量  ZDR柱  KDP柱
英文关键词:supercell  Polarimetric Signature  ZDR columns  KDP columns
基金项目:
作者单位E-mail
刁秀广 山东省气象台 radardxg@126.com 
郭飞燕  guofeiyan01@163.com 
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中文摘要:
      利用青岛S波段双偏振多普勒天气雷达资料和常规观测资料以及区域自动站气象资料,对2019年8月16日发生在山东省诸城市的一次长寿命超级单体风暴双偏振结构特征进行了分析。结果表明:超级单体风暴发生在东北冷涡和地面中尺度辐合线共同作用背景之下,CAPE偏弱,但垂直风切变非常强,这种配置也利于超级单体风暴的形成与维持。诸城超级单体风暴持续3h左右并伴有深厚持久的中气旋,旺盛阶段DBZM、C-VIL、HT和TOP平均值分别为74.1dBZ、67. 9 kg·m-2、6.3km和11.3km。偏振特征分析表明,风暴低层60dBZ以上回波区对应偏小的ZDR、小的CC和大的KD P,湿(或干)冰雹和液态雨滴共存。此外,低层入流缺口附近有明显ZDR弧存在。风暴中层强上升气流区内有明显的BWER,其顶部达到7km左右。BWER内CC较小,其外围有明显的ZDR环和CC环,ZDR环部达到-10℃层高度。0℃层高度之上存在深厚的ZDR柱和KDP柱,顶部都达到-20℃层高度,ZDR柱位于BWER东侧,KDP柱位于BWER西侧。 -10℃~-20℃层高度之间,ZDR柱对应强的Z(35~60dBZ)和小的KDP,表明含有少数偏大的液态或湿冰粒子,而KDP柱对应更强的Z(55~72dBZ)和小的ZDR,表明含有一定数量的小的液态或(和)湿冰粒子及大的冰雹粒子。风暴低层强反射率核后侧径向上如果出现显著ZDR负值区,可作为特大冰雹(直径≥50mm)的识别依据。风暴低层强反射率核对应异常大的KDP值,表明含有浓度较高的液态雨滴和包有水膜的冰雹粒子。
英文摘要:
      Using Qingdao dual-polarization CINRAD/SA data, conventional observation data and regional automatic station meteorological data, the polarimetric radar signatures of a supercell storm occurred in Zhucheng, Shandong Province on 16 August 2019 are analyzed. The results show that: the supercell storm occurred under the background of the interaction of the northeast cold vortex and the surface mesoscale convergence line. The Cape was weak, but the vertical wind shear between 0 and 6 km was very strong, this configuration was also conducive to the formation and maintenance of supercell storms. The average values of DBZM, C-VIL, HT and TOP of Zhucheng supercell storm, which lasted about 3 hours and accompanied by deep and persistent mesocyclone , were 74.1 DBZ, 67.9 kg·m-2, 6.3 km and 11.3 km respectively in the vigorous stage. The echo area above 60dBZ in the lower layer of the storm had smaller ZDR, smaller CC and larger KDP ,this polarization signatures indicated that a certain number of wet (or dry) hail and liquid raindrops exist at the same time. In addition, obvious ZDR arcs near the inflow gap in the lower layer of the storm were found. The bounded weak echo region (BWER) was detected in the strong updraft area in the middle layer of the storm, and the top of BWER reached about 7km. The ZDR and CC rings around the BWER were observed in the middle layer , and the top of ZDR ring reached the -10℃ layer height. The deep ZDR and KDP columns above the 0℃ layer height were observed in the vicinity of the main rotating updraft with their tops reaching the -20℃ layer height. The ZDR column was located to the east of the BWER and the KDP column was located to the west of the BWER. The ZDR column between 10℃ and - 20℃ layer height corresponded to strong Z(35~60dBZ) and small KDP, indicating that there are a few large liquid or (and)wet ice particles, while the KDP column corresponded to stronger Z(55~72dBZ) and small ZDR, indicating that there are a number of small liquid or (and) small wet ice particles and large ice particles. If there are significant negative ZDR values in the radial direction behind the strong reflectivity core at the lower layer of the storm, it can be used as the identification basis for extremely large hail (diameter≥50mm). The strong reflectivity core at the lower layer of the storm corresponded to an abnormally large KDP value, indicated that it contained hail particles covered with water film and high concentration of liquid raindrops.
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