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一次弱降雹过程的雷达产品特征及识别方法
引用本文:支树林,汤达章.一次弱降雹过程的雷达产品特征及识别方法[J].气象与减灾研究,2008,31(2):36-42.
作者姓名:支树林  汤达章
作者单位:1. 南京信息工程大学大气科学学院,江苏,南京,210044;江西省气象台,江西,南昌,330046
2. 南京信息工程大学大气科学学院,江苏,南京,210044
基金项目:国家自然科学基金 , 江西省气象局资助项目
摘    要:首先分析了多普勒雷达垂直累积液态含水量(VIL)产品的不足之处,并在此基础上提出了直接将雷达反射因子作空间积分的算法;然后综合利用重新计算的VIL、VIL密度和不同高度的反射率密度(VIZ),来判断和识别强对流天气;最后通过对发生在江西境内的1次弱降雹过程的分析,在日常临近预报流程的基础上,着重分析了VIZ、VIL和VIL密度等物理量的时间变化特点。分析结果表明,这些物理量除了可以准确判断出有冰雹发生外,还可以根据其时间变化大致估算出地面降雹时间。

关 键 词:反射率密度  VIL密度  温度层  冰雹

Characteristics of Radar Products and Its Identification in a Weak Hail Event
ZHI Shu-lin,TANG Da-zhang.Characteristics of Radar Products and Its Identification in a Weak Hail Event[J].Meteorology and Disaster Reduction Research,2008,31(2):36-42.
Authors:ZHI Shu-lin  TANG Da-zhang
Institution:ZHI Shu-lin , TANG Da-zhang ( 1. Department of Atmosphere Sciences, NUIST, Nanjing 210044, China; 2. Jiangxi Provincial Meteorological Observatory, Nanchang 330046, China)
Abstract:In this paper, the shortage of VIL product on Doppler radar is expatiated,and a new algorithm with spatial integration of reflectivity value is proposed. By the combined analysis of the recalculated VIL, VIL density and reflectivity density (VIZ) at different heights, the convective weather can be recognized and distinguished. Based on the routine nowcasting flow, a weak hail event in Jiangxi is analyzed with emphasis on the change trend of those parameters as VIZ, VIL and VIL density. The result shows that not only the hail can be recognized, but also its falling time can be estimated by using those parameters.
Keywords:Reflectivity density  VIL density  Temperature layer  Hail
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