干旱气象

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山东中部一次强对流天气的中尺度结构和闪电特征分析

朱义青赵海军庄重高安春曹张驰张品竹刘英杰   

  1. 山东省临沂市气象局,山东临沂276004
  • 出版日期:2015-10-30 发布日期:2015-10-30
  • 作者简介:朱义青(1985-),男,山东蒙阴人,工程师,从事中短期预报.E-mail:lyzhuyiqing@163.com

Mesoscale Structure and Lightning Features of a Convective Weather Process in Center of Shandong Province

HU Yiqing , ZHAO Haijun, ZHUANG Zhong, GAO Anchun,CAO Zhangchi, ZHANG Pinzhu, LIU Yingjie   

  1. Linyi Meteorological Bureau of Shandong Province,Linyi  276004, China
  • Online:2015-10-30 Published:2015-10-30

摘要:

利用常规资料、NCEP再分析资料、闪电定位资料、多普勒雷达资料、FY-2E云图资料及全球定位系统(GPS)可降水量资料对2013年7月4日山东中部出现的一次强对流天气过程进行分析,结果表明:高空短波槽东移、地面中尺度气旋系统发展和东北低压槽后干冷空气入侵,是造成本次鲁中地区强对流天气的成因;强对流发生在低层辐合、高层辐散区域并与上升气流最强区对应;负地闪密集区,对应对流有效位能(CAPE)和假相当位温高值区;地闪主要分布在云顶亮温(TBB)<-60 ℃的区域内,TBB值越低,负地闪越密集。在整个强对流发展过程中,负地闪占绝对优势;负地闪多存在于回波强度>48 dBZ和顶高≥10 km的强回波区;雷达垂直累积液态含水量(VIL)和GPS可降水量能反映出降水出现时间和降水性质,雷达VIL峰值与降水出现时间较吻合;特殊地形对降水有很大贡献。

关键词: 山东中部, 地闪, GPS, 地形

Abstract:

Based on conventional observation data, NCEP reanalysis data , lightning location data , Doppler radar data, FY-2E satellite images and Global Positioning System(GPS) precipitable water, the severe convective weather process in central part of Shandong Province on July 4, 2013 was analyzed. The results show that the eastward movement of short wave trough, development of mesoscale cyclone system and invasion of the dry and cold air masses from the back of northeast trough resulted in this strong convection weather. Strong convection appeared in low-level convergence and high-level divergence region, which corresponded to the strongest updraft area. The intensive region of negative cloud-to-ground lighting correspond to higher convection available potential energy(CAPE) and pseudo-equivalent potential temperature values. Lightning  mainly distributed in area with equivalent blackbody temperature(TBB) less than 60 ℃. The lower TBB was, the more intensive cloud to ground lighting became. During development of the strong convection, the negative cloud-to-ground lighting was predominant in the whole strong convective process. Negative cloud-to-ground lighting mainly located at the strong echo area with intensity > 48 dBZ and echo top height ≥10 km. Radar vertically integrated liquid(VIL) and GPS could reflect the precipitation time and precipitation properties. The radar VIL peak value fitted well with the time of precipitation. Special terrain had a great contribution to the precipitation.

Key words: the central of Shandong Province, cloud to ground lighting, Global Positioning System (GPS), terrain

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