摘要
利用NCEP再分析资料、昆明多普勒天气雷达和地面加密自动站资料,分析2016年4月19日傍晚出现在昆明地区的雷暴大风天气过程的中尺度特征.结果表明:弱南支槽与切变线配合,高低空急流耦合作用及动量下传共同造成了此次地面雷暴大风天气;层结不稳定,地面辐合线等为其提供了良好的环境条件.本次为飑线过程,存在后侧弱回波区,明显的速度模糊,低层速度大值区、高层辐散、低层辐合、"牛眼"型结构及深厚的中层径向辐合(MARC)等特征,均对提前预报预警地面大风有很好的指示性.地面大风与飑线、地面中尺度辐合线和辐散区密切相关,根据地面辐合线可提前1 h左右预警飑线.
Based on the NCEP reanalysis data, Doppler radar data in Kunming and intensive network of automatic weather station,the mesoseale characteristics of thunderstorm gale event occurred in Kunming on 19 April 2016 has been analyzed.The results show that the thunderstorm gale event was caused by weak southern branch wave and shear line with high-low layer jet coupling, and momentum transmission, unstable stratification and the surface convergence line contributed to the development of the storm. This event was influenced by the squall line, the weak echo region behind squall line were quite clear, the velocity ambiguity, the large velocity area and convergence in the low level,divergence in the upper level ,＂ NiuYan＂ type structure, and deep midaltitude ra- dial convergence （MARC） could be studied in indicating ground wind.The ground wind was closely related with the squall line, surface mesoscale convergence line and divergence, according to the surface convergence line, squall line could be warning early about an hour.
作者
杨芳园
杨素雨
周稀
邹灵宇
段燕楠
潘娅婷
李晓鹏
YANG Fang-yuan;YANG Su-yu;ZHOU Xi;ZOU Ling-yu;DUAN Yan-nan;PAN Ya-ting;LI Xiao-peng(Meteorological Observatory of Kunming, Kunming 650034, China;Meteorological Observatory of Yunnan Province, Kunming 650034, China)
出处
《云南大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第4期716-725,共10页
Journal of Yunnan University(Natural Sciences Edition)
基金
云南省气象局科研项目(TQ201603)
云南省气象局重点项目(TQ201701)
云南省科技厅应用基础项目(2014FB165)
关键词
雷暴大风
雷达回波
速度模糊
地面流场
thunderstorm gale
radar echo
velocity ambiguity
surface flow field
