易笑园,张义军,王红艳,董昊,张楠,徐姝. 2013. 线状中尺度对流系统内多个强降水单体的结构演变及闪电活动特征[J]. 气象学报, 71(6):1035-1046, doi:10.11676/qxxb2013.094
线状中尺度对流系统内多个强降水单体的结构演变及闪电活动特征
Characteristics of the evolution of the severe rainfall cells structure in the Leading Line Meso-scale Convective System and the lightning activity
投稿时间:2013-03-28  修订日期:2013-08-22
DOI:10.11676/qxxb2013.094
中文关键词:  线状中尺度对流系统  γ中尺度对流单体  结构演变  雷达参量  闪电活动
英文关键词:LL-MCS  γ-mesoscale convective cell  Structure evolution  Radar parameter  Lightning activity
基金项目:公益性行业(气象)专项(GYHY201006005);国家自然科学基金(41275044、41030960);灾害天气国家重点实验室开放课题(2013LASW-09);中国气象局预报员专项(CMATG2009YB04)。
作者单位
易笑园 天津市气象台, 天津, 300074
中国气象科学研究院灾害天气国家重点实验室, 北京, 100081 
张义军 中国气象科学研究院灾害天气国家重点实验室, 北京, 100081 
王红艳 中国气象科学研究院灾害天气国家重点实验室, 北京, 100081 
董昊 天津市气象台, 天津, 300074 
张楠 天津市气象台, 天津, 300074 
徐姝 天津市气象台, 天津, 300074 
摘要点击次数: 3062
全文下载次数: 3025
中文摘要:
      利用多普勒雷达、SAFIR3000三维闪电定位系统和气象自动站等观测资料,以线状中尺度对流系统内多个γ中尺度强降水单体为研究对象,揭示了单体之间、单体与β中尺度线状对流系统的多种相互关系,设计多种雷达参量对单体的结构演变进行定量化描述,进一步建立了对流单体结构演变与闪电活动的相互关系。得到以下结论:(1)线状中尺度对流系统内顺义、房山、固安、宝坻对流单体分别造成了1 h降雨23、50、27、70 mm,在其演变过程中,顺义单体被另一个单体追逐、供给,房山单体包括2个更小单体的合并过程,而固安、宝坻单体的初生和发展与线状中尺度对流系统是被喂养、吞食的关系。(2)设计的雷达参量V40(40 dBz强回波核的体积大小)、V40UP-6(6 km高度以上40 dBz强回波核的体积大小)、SET11(回波顶在11 km处的回波范围大小)量化描述了单体的三维结构演变特征,Fic(云闪频数)和Fcg(地闪频数)与上述雷达参量关系密切,如与V40UP-6的相关系数为0.63—0.97;而FicFcg更敏感地呼应单体结构的变化。(3)固安单体在成熟阶段,主正电荷区(即辐射点最大密集区所处的地方)维持在较低位置,远低于其他单体在成熟阶段主正电荷区的高度。(4)在对流单体合并后,FicFcg增大且主正电荷区明显抬升、闪电频数陡增对应降水强度增大、闪电频数峰值超前于降雨强度极值等特征,对灾害天气的预警具有积极意义。
英文摘要:
      The data from the Doppler radar, SAFIR3000 lightning location system and high-density automatic meteorological stations observations are used to design a variety of radar quantitative parameters and analyze the evolution of cells structures, the lightning activity and electrical vertical structure of the severe rainfall cells structure in a Leading Line Meso-scale Convective System (LL-MCS). The relationship between convective cells and β-mesoscale LL-MCS is revealed. The conclusions are as follows. At first, the four cells (Gu'an in Hebei, Shunyi and Fangshan in Beijing, Baodi in Tianjin) in the single squall respectively brought rainfalls of about 23 mm, 50 mm, 27 mm and 70 mm in one hour. In the Fangshan cell, two smaller monomers were merged. The cell of Shunyi was followed by the other cell. In the Gu'an and Baodi cell, their development is related to LL-MCS by feeding and swallowing. Secondly, V40 (40 dBz echo volume range), V40UP-6 (40 dBz echo volume above the height of 6 km), SET11 (echo area range at 11 km level) could describe the 3D quantitative structure change of a cell, and Fcg (CG lightning frequency) and Fic (IC flash frequency) were closely related to the radar parameters, such as its correlation coefficient with V40UP-6 being between 0.63 and 0.97. The flash frequency of IC was more sensitive than CG to echo structure change. Thirdly, the height of the radiant point maximum concentration area in the Gu'an cell was below 6 km, which was far lower than the other cells at the same stage. At last, the feature of lightning frequency of CG and lightning frequency of IC increased with the main positive charge area significantly lifted after the merger of convective cells, and the characteristics of the lightning frequency increase showing relationship with the rainfall intensity increasing as well as the lightning frequency peak leading the maximum of rainfall intensity have positive significance for warning of disaster weather.
HTML   查看全文   查看/发表评论  下载PDF阅读器
分享按钮