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华东地区一次飑线过程的地闪演变特征
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南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心/中国气象局气溶胶与云降水重点开放实验室,南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心/中国气象局气溶胶与云降水重点开放实验室,南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心/中国气象局气溶胶与云降水重点开放实验室,南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心/中国气象局气溶胶与云降水重点开放实验室,南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心/中国气象局气溶胶与云降水重点开放实验室,南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心/中国气象局气溶胶与云降水重点开放实验室

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P427.3

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国家重点基础研究发展计划（973计划）;国家自然科学基金项目（面上项目，重点项目，重大项目）;中国气象科学研究院基本科研业务费专项


Evolution of the cloud-to-ground flash characteristicsduring a Squall Line in East China
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Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/ Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD)/ Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology,Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation center on Forecast and Evaluation of Meteorological Disaster (CIC-FEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology,Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation center on Forecast and Evaluation of Meteorological Disaster (CIC-FEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology,Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation center on Forecast and Evaluation of Meteorological Disaster (CIC-FEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology,Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation center on Forecast and Evaluation of Meteorological Disaster (CIC-FEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology,Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation center on Forecast and Evaluation of Meteorological Disaster (CIC-FEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology

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    摘要:

    为了深入地了解飑线的触发机制和其地闪活动演变特征，本文利用全国地闪定位资料、常规气象观测资料、雷达资料，分析了发生在安徽和江苏地区的一次飑线过程的天气背景、地闪时空分布特征及其与雷达回波之间的关系。结果表明，飑线的发生依赖于“下湿上干”的不稳定大气层结，低层的辐射逆温层加剧了不稳定能量的积累，槽前高低空急流和副热带高压带来了充足的水汽和热量，同时低涡和切变线提供动力条件。此次飑线过程中，负地闪占主导，一般集中于45~55 dBZ的强回波区，而正地闪更容易发生于强对流中心外围30~45 dBZ的次强回波区内，负地闪和正地闪的频数演变特征在飑线成熟阶段基本一致，但正地闪在对流云体减弱时却显得相对活跃。地闪活动集中于回波顶高（8~14 km）且40 dBZ回波顶高突破了0 ℃层结高度尤其是突破了-10 ℃的区域。随着对流系统的减弱负地闪更加趋向发生于强回波中心，而正地闪主要分布于回波单体之间的过渡区，对单体的对流强度要求较负地闪要低。

    Abstract:

    In order to understand the trigger mechanism of the Squall Line and its evolution characteristics of the cloud-to-ground (CG) lightning activity more thoroughly. The paper has taken a squall line process in Anhui and Jiangsu provinces as the research object by using the national lightning location data, regular weather data, Sounding data and Doppler weather radar data, which are used to analyze the weather background, the CG lightning temporal and spatial characteristics and its relationship with radar echo during this process. The results show that the occurrence of the squall line depends on the unstable atmospheric environment, sustaining high humidity in lower layer and low humidity in high layer. The inversion layer of low layer aggravates the accumulation of unstable energy and heat and vapor are transported by upper and lower jet in front of trough and subtropical high, besides the vortex and shear line provide dynamic conditions. The negative cloud-to-ground (-CG) flash is predominant at the squall line process. The frequency evolution characteristics of the positive cloud-to-ground (+CG) and -CG flash are basically consistent at the stage of squall line maturation, but positive ground-flashing is relatively active when the convective cloud is weakened. -CG flashes are generally concentrated in the intense echo region with high reflectivity (45 dBZ~55 dBZ), while the occurrence of the +CG flash is more inclined to the echo region with reflectivity (30 dBZ~45 dBZ) at theSperipherySof strong convective centers. CG lightning activity is concentrated in the area of 8~14km echo top and 40dBZ echo top height, where breaks through the height of 0 ℃ layer, especially -10 ℃. The -CG flash tends to occur at the center of the strong echo with the weakening of the convective system, while the +CG flash mainly distributes in the transition zone between the echo monomers and requires a relatively weaker convective intensity than that of the negative one.

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郭凤霞,刘祖培,鲍敏,等. 华东地区一次飑线过程的地闪演变特征[J]. 科学技术与工程, 2017, 17(25): .
Guo Feng Xia, Liu Zu Pei, Bao Min, et al. Evolution of the cloud-to-ground flash characteristicsduring a Squall Line in East China[J]. Science Technology and Engineering,2017,17(25).

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  • 收稿日期:2017-01-13
  • 最后修改日期:2017-04-13
  • 录用日期:2017-05-05
  • 在线发布日期: 2017-09-13
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