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doi:  10.12013/qxyjzyj2017-034
2017年3月江苏北部一次雷雨大风天气过程分析

Analysis on a disastrous thunderstorm and gale case in the north of Jiangsu Province
摘要点击 316  全文点击 241  投稿时间:2017-06-14  修订日期:2017-09-05
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基金:  江苏省气象局预报员专项项目(编号:JSYBY201612);江苏省气象局青年科研基金项目(编号:Q201708);连云港市科技局项目(编号:SH1013);连云港市气象局科技计划项目(编号:LG201604)
中文关键词:  雷雨大风,冷空气,环流形势,温度直减率,水汽条件
英文关键词:  thunderstorm and gale  cold air  circulation situation  temperature lapse rate  moisture condition
           
作者中文名作者英文名单位
刘瑞翔Liu Ruixiang连云港市气象局
郝玲Hao Ling连云港市气象局
姚雷Yao Lei连云港市气象局
朱敏华Zhu Minhua连云港市气象局
引用:刘瑞翔,郝玲,姚雷,朱敏华.2017,2017年3月江苏北部一次雷雨大风天气过程分析[J].气象与减灾研究,40(3):223-230
中文摘要:
      利用多种常规观测资料和NCEP/NCAR再分析资料,分析了2017年3月1日江苏北部出现的一次罕见冷空气雷雨大风天气过程的发生背景、地面要素和云团演变特征,同时从大气动力、热力和水汽条件出发分析了午后对流的成因。结果表明:此次过程发生前,江苏地区位于高空槽前,对流层中低层有冷式切变线伴随两股冷空气南下,受江苏省北部地面气旋阻挡,冷空气在上游堆积,当气旋东移入海冷空气爆发式南下时,造成严重的大风灾害。此次过程中,对流层中高层大气降温而低层回温使大气温度直减率增大,为对流发生提供不稳定条件,但水汽输送主要集中在低层,且高层大气无明显抽吸作用,导致此次过程未发生强对流性降水,主要以大风灾害性天气为主。
Abstract:
      A rare thunderstorm and gale case occurred in the northern part of Jiangsu province on 1 March 2017, which caused serious meteorological disaster. Based on multiple kinds of conventional meteorological data, the variation characteristics of meteorological factors and cloud evolution were discussed,and the background of atmospheric circulation and causes of convection were investigated using NCEP/NCAR reanalysis data. The results indicated that before the convection occurred, Jiangsu was in front of the trough at 500 hPa, and two strands of cold air moved southward with shear line in the middle and lower atmosphere. The southward cold air was blocked by a surface cyclone in northeast Jiangsu province and accumulated in Hetao region.As the cumulated cold air burst southward while the surface cyclone moved to the east, a gust front was recognized by the doppler radar of Yancheng. Lapse rate increased when the temperature of lower troposphere rose while that of mid and high troposphere decreased, which provided instability condition for the convection. The moisture amassed at the bottom of atmosphere and the divergence at high altitude was weak, thus no heavy rain occurred.
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