doi:  10.3878/j.issn.1006-9895.1704.17102
西北太平洋地区热带气旋闪电活动的气候学特征及其与气旋强度变化的关系

Climatological Characteristics of Lightning Activity within Tropical Cyclones and Its Relationship to Cyclone Intensity Change over the Northwest Pacific
摘要点击 49  全文点击 58  投稿时间:2017-01-04  
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基金:  国家重点基础研究发展计划(973计划)项目2014CB441401,国家自然科学基金项目41475002
中文关键词:  热带气旋  时空分布  热带气旋强度  强度变化
英文关键词:  Tropical cyclones  Spatial and temporal distribution  Tropical cyclone intensity  Intensity change
        
作者中文名作者英文名单位
王芳WANG Fang中国科学院大气物理研究所中层大气和全球环境探测重点实验室, 北京 100029;中国科学院大学, 北京 100049;浙江省气象安全技术中心, 杭州 310008
郄秀书QIE Xiushu中国科学院大气物理研究所中层大气和全球环境探测重点实验室, 北京 100029;中国科学院大学, 北京 100049
崔雪东CUI Xuedong浙江省气象安全技术中心, 杭州 310008
引用:王芳,郄秀书,崔雪东.2017.西北太平洋地区热带气旋闪电活动的气候学特征及其与气旋强度变化的关系[J].大气科学,6(6):1167-1176,doi:10.3878/j.issn.1006-9895.1704.17102.
Citation:WANG Fang,QIE Xiushu,CUI Xuedong.2017.Climatological Characteristics of Lightning Activity within Tropical Cyclones and Its Relationship to Cyclone Intensity Change over the Northwest Pacific[J].Chinese Journal of Atmospheric Sciences (in Chinese),6(6):1167-1176,doi:10.3878/j.issn.1006-9895.1704.17102.
中文摘要:
      利用2005~2014年全球闪电定位网(WWLLN)资料和中国气象局提供的热带气旋(Tropical Cyclone,TC)位置和强度资料,分析了近10年西北太平洋地区228个TC中的闪电时空分布特征及其与气旋强度变化的关系。结果表明:TC闪电活动年际变化呈震荡分布,夏半年闪电活动比冬半年强,闪电频数日变化呈单峰分布,峰值出现在12:00(地方时,下同),谷值出现在06:00。闪电密度呈三圈分布结构,内核区和外雨带区闪电密度较高,内雨带区最低;闪电密度空间不对称分布,最高值出现在TC南侧。TC强度改变时,内核区闪电密度随TC不同强度等级的分布与外雨带区不同。TC内核区闪电活动较外雨带区强,内核区和外雨带区的闪电密度最大值分别出现在TC快速增强和强度一般变化时;快速增强过程一般发生在中等强度的TC中,而快速减弱过程一般发生在强度较强的TC中。TC快速增强前后,内核区闪电活动变化比全部TC闪电和外雨带区明显,表明内核闪电活动较全部TC闪电和外雨带区闪电能更好的指示TC的快速增强。
Abstract:
      The spatial and temporal distribution of lightning activity and its relationship with tropical cyclone (TC) intensity change for 228 TCs over the Northwest Pacific are studied using 10 years (2005-2014) of time series data provided by the WWLLN (World-Wide Lightning Location Network) along with TC position and intensity data from China Meteorological Administration. The average flash rate shows an oscillatory variation from 2005 to 2014, and TC flash rate in the summer half year is higher than that in the winter half year. The average flash rate increases in the morning and decreases obviously in the night with the maximum at 1200 LT (local time) and the minimum at 0600 LT. TCs exhibit three distinct regions of electrical activity, with higher flash density in both the inner core and outer rainband and the minimum in the inner rainband. The azimuthal distribution of flash density is asymmetric, and the highest flash density appears to the south of the TC center. Lightning activity at six TC intensity levels in the inner core is different from that in the outer rainband when the TC intensity changes. Lightning activity in the inner core is more active than in the outer rainband, and the highest flash density appears in rapid intensification (RI) cases and average intensity change (AIC) cases for the inner core and outer rainband, respectively. Lightning for RI cases often occurs in medium intensity TCs, while rapid weakening (RW) cases are at strong TCs. For RI cases, flash density changes with time are more evident in the inner core than in the outer rainband and the whole TC region, which indicates that lightning activity in the inner core could be a better indicator for short-term RI forecast.
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