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渤海西部雷雨大风统计特征及对流参数指标分析
王亚男1, 刘一玮2
(1.天津市气象局,300074;2.天津)
Study Statistical Characters and Convective Indexes of Thunderstorm Wind over Western Bohai
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投稿时间:2018-07-17    修订日期:2019-05-29
中文摘要: 地面使用渤海西部海岛、平台、浮标站加密资料,高空使用北京、乐亭探空资料,对2011-2016年5-9月渤海西部海区雷雨大风统计特征和对流参数指标及阈值进行分析。结果表明:共42次过程,8-9级为主,渤海西部偏南比偏北海区过程多;6月发生最多,其次是7月,5月最少;在下午到前半夜发生最多,上午很少,6月在19-23时发生最多;主要受高空冷涡影响,其次是高空低槽,6月冷涡影响是低槽影响过程数的两倍;以线性回波影响最多,其次是阵风锋;大风发生前2h内,渤海西部降温增压,3小时变压2hpa,逐时负变温>3℃,且比上游沿岸温度高4℃/Lon以上,气压低2hpa/Lon;对渤海西部雷雨大风发生潜势具有指示意义的对流参数主要包括抬升指数、大风指数、最佳对流有效位能、强天气威胁指数和0-3km垂直风切变。
Abstract:The statistical character and convective indexes threshold of thunderstorm wind over Western Bohai are analyzed Using intensive observation datas of seven stations including islands、platforms and buoy stations in Western Bohai and sounding datas over Beijing and Laoting between May to September from 2011 to 2016.The results show that winds force of 42 process are mainly from 8 to 9 ;thunderstorm wind occur more southern than northern part of the Western Bohai Sea,mostly occur in June, secondly in July, rarely in May,mostly occur from afternoon to first half of the night, rarely occur in the morning, mostly occur from 19:00 to 23:00 in June; mostly relate cold vortex,secondly relate high-level trough, relate cold vortex twice as many as high-level trough in June, mostly relate linear radar echo, secondly relate gust front; detemperature and rise-pressure are occur 2 hours before thunderstorm wind in Western Bohai ,3h pressure change is 2hpa,1 hour negtive temperature change is more than 3℃ and sea surface temperature is higher 4℃/Lon than coastal temperature and sea surface pressure is lower 2hpa/Lon than coastal pressure; the convective indexes of thunderstorm wind over Western Bohai mainly include CAPE、DCAPE、LI、WINDEX and SRH.
文章编号:201807170315     中图分类号:    文献标志码:
基金项目:“环渤海强对流大风特征及预报指标分析”(QYXM201604)资助;
引用文本:
王亚男,刘一玮,0.[en_title][J].Meteor Mon,():-.
Wang Yanan,Liu Yiwei,0.Study Statistical Characters and Convective Indexes of Thunderstorm Wind over Western Bohai[J].Meteor Mon,():-.