范俊红,易笑园. 2019. 大范围持续暴雪过程中多种影响系统的对比分析[J]. 气象学报, ():-, doi:10.11676/qxxb2019.045
大范围持续暴雪过程中多种影响系统的对比分析
FAN Junhong YI Xiaoyuan
投稿时间:2018-07-30  修订日期:2019-01-20
DOI:10.11676/qxxb2019.045
中文关键词:  大范围持续暴雪,华北锢囚锋,江淮气旋,北路冷锋,特征对比
英文关键词:A wide range of continuous snowstorm, The North China occluded front, The Jianghuai cyclone, northly cold front, Characteristic comparison
基金项目:河北省科技厅科技支撑计划项目(14275402D,河北省暴雪预报技术研究),国家自然科学基金项目(41075030,华北锢囚锋大雪(暴雪)天气的结构特征及预报技术研究)
作者单位E-mail
范俊红 河北省气象服务中心 378307267@qq.com 
易笑园 天津市气象台 Yixy123@sina.com 
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中文摘要:
      持续48小时的大范围雨转暴雪天气先后影响了陕西、山西、北京、河北、辽宁等地,华北地区降雪量达到15—30mm。此次过程中地面影响系统复杂,有华北锢囚锋、江淮气旋、北路冷锋,[资料和方法]利用准地转理论、凝结函数法、垂直剖面分析和常规观测资料、GFS0.5°×0.5°再分析资料等,[目的]对比分析了华北锢囚锋和江淮气旋在降雪量和降水效率、水汽和动力条件、垂直结构等方面的特征和差异,并描述了多种地面影响系统的演变和相互作用。[结果和结论]结果表明:(1)在降雪量和效率上,华北锢囚锋降雪量小于江淮气旋,华北锢囚锋主要影响华北西部,降雪持续24小时,江淮气旋主要影响华北中东部,降雪持续30小时;降水前半段华北锢囚锋降水效率为0.76,江淮气旋为0.58,降水后半段两者均为1.5;(2)在水汽条件上,华北锢囚锋明显弱于江淮气旋,华北锢囚锋水汽通道在700hPa上,来自西南地区,而江淮气旋在700hPa和850hPa上,来自西南地区和东海;华北锢囚锋水汽含量中心和水汽辐合中心主要集中在近地面层锢囚锋附近,而江淮气旋在800-600hPa之间气旋北侧偏南气流里;(3)在动力条件上,华北锢囚锋明显弱于江淮气旋,华北锢囚锋南段涡度平流垂直微差项起主要作用,北段温度平流拉普拉斯项起主要作用,江淮气旋温度平流的拉普拉斯项和涡度平流的垂直微差项均起到了重要作用;(4)在垂直结构上,江淮气旋锢囚时为冷式锢囚锋,并有北路冷锋楔入其暖锋下面,强度明显强于华北锢囚锋;(5)在演变和相互作用上,江淮气旋的北上减弱了华北锢囚锋;北路冷锋对随江淮气旋北上的暖湿气流起到‘冷垫’抬升作用。
英文摘要:
      The large range of rain and snowstorm lasting 48 hours has affected Shaanxi, Shanxi, Beijing, Hebei, Liaoning successively. The snowfall in North China reaches 15 - 30mm. In this process, the ground influence system is complex, including the North China occluded front, the Jianghuai cyclone and the northly cold front. By using the quasi geostrophic theory, the condensation function method, the vertical section analysis and the conventional observation data, and the GFS0.5 * 0.5 degree reanalysis data, the characteristics and differences between the North China occluded front and Jianghuai cyclone are compared and analyzed on snowfall and snowfall efficiency, the water vapor and dynamic conditions, the vertical structure and so on, and the evolution and interaction of various ground impact systems are described as well.The results showed that: (1) in the snowfall and efficiency, the snowfall amount of North China occluded front was less than that of the Jianghuai cyclone. The North China occluded front mainly influenced the western North China, and the snowfall lasted for 24 hours. The Jianghuai cyclone mainly affected the middle and eastern North China, and the snowfall lasted for 30 hours. In the first half of precipitation,The precipitation efficiency of North China occluded front was 0.76 ,and that of the Jianghuai cyclones was 0.58,in the later half period,both of them were 1.5.(2) in the water vapor condition, the North China occluded front is obviously weaker than that of the Jianghuai cyclone. The water vapor channel of the North China occluded front comes from the southwest region on the level of 700hPa, and the Jianghuai cyclone comes from the southwest region and the East China Sea on the levels of 700hPa and 850hPa. The water vapor content and the convergence centers of the North China occluede front are mainly concentrated near the surface layer,and the Jianghuai cyclone is located between the 800-600hPa.(3) on the dynamic condition, the North China occluded front is obviously weaker than the Huaihe cyclone, and the vertical differential term of the vorticity advection in the southern part of the North China occluded front plays a major role, while in the northern part the temperature advection Laplasse term plays a major role. the vertical differential term of the vorticity advection and the Laplasse term of the temperature advection in the Jianghuai cyclone has both played an important roles.(4) On the vertical structure, the Jianghuai cyclone is a cold occluded front with the northly cold front under its warm front zone, and its intensity is stronger than that of the North China""s occluded front.(5) in the evolution and interaction, the going up north of the Jianghuai cyclone weakened the intensity of the North China occluded front, and the nothly cold front uplifted the warm and wet gas flow in the north of the Jianghuai cyclone as a "cold pad".
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