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气象:2020,46(11):1427-1439
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SC型双偏振雷达在江南南部一次对流性天气过程中的应用分析
赖晨,支树林,李婕,杨钢
(江西省大气探测技术中心,南昌 330096;江西省气象台,南昌 330096;江西省吉安市气象局,吉安 343000)
Application of SC Dual-Polarization Radar to a Convective Weather Case in South to Yangtze River
LAI Chen,ZHI Shulin,LI Jie,YANG Gang
(Jiangxi Atmospheric Detection Technology Center, Nanchang 330096;Jiangxi Meteorological Observatory, Nanchang 330096;Ji’an Meteorological Office of Jiangxi Province, Ji’an 343000)
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投稿时间:2019-07-26    修订日期:2020-07-20
中文摘要: 2019年3月21日发生在江南南部地区的区域性对流天气灾害种类多,强度强,范围广,也是江西吉安SC型多普勒雷达进行双偏振改造后遇到的首次区域性强对流过程。利用其探测资料,分析了双偏振雷达参量的分布与演变特征,并与地闪等观测资料进行对比,探究了其在短时强降水和风雹天气中的不同特征,结果发现:此次过程中,发生短时强降水期间,低仰角的水平反射率ZH和差分反射率ZDR会出现增大,且比地面分钟级雨量开始增大的时间显著超前,而地闪频数的增大要更超前,比ZH和ZDR开始增大的时间分别早6 min和5~10 min;差分相移率KDP峰值出现时间滞后于闪电频数峰值约15 min,反映出此次过程中这些特征有助于预测地面雨强的演变趋势。在风雹过程中,ZH开始增加的时刻超前于地面降雹时刻约15 min,其他偏振量的提前时间更早;同时,冰雹发生时地闪频数迅速增大,这些特征在此次过程中对冰雹的预报具有很好的指示作用。此外还探究了由ZH得到的冰相粒子降水含量M与降雹时间的关系,发现前者提前于后者15 min出现激增,且高度越高,M峰值就出现得越早,因此可为提前预报出地面降雹的可能时刻提供参考。
Abstract:On 21 March 2019, a large-scale convective weather disaster occurred in the southern part of the south to Yangtze River, 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. Based on the radar detection data, the distribution and evolution characteristics of the dual-polarized radar parameters were analyzed, and compared with the observation data of cloud-to-ground flashes (CGs). Besides, the differences in performance characteristics between short-time severe rain and hailstorm were 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 angles 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 KDP lags behind lightning for about 15 min, which could help to predict the evolution trend of ground rain intensity in this process. During the hailstrom process, the moment when ZH begins to increase is about 15 min before the ground sag, and the other polarizations advance even earlier. At the same time, CGs increase rapidly when hail occurs. These characteristics have a good indication for hail predictions in this process. In addition, this paper also explores the relationship between the precipitation value M of ice particles and hail. It was found that it surges 15 min ahead of falling to the ground, and the higher the altitude, the earlier the M peak appears. This could provide reference for predicting the possibility moment of hail.
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基金项目:中国气象局预报员专项项目(CMAYBY2019-058)资助
引用文本:
赖晨,支树林,李婕,杨钢,2020.SC型双偏振雷达在江南南部一次对流性天气过程中的应用分析[J].气象,46(11):1427-1439.
LAI Chen,ZHI Shulin,LI Jie,YANG Gang,2020.Application of SC Dual-Polarization Radar to a Convective Weather Case in South to Yangtze River[J].Meteor Mon,46(11):1427-1439.