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安徽省南部两次冻雨天气过程对比分析<sub>*</sub>
王传辉, 姚叶青, 苗开超, 姚镇海, 刘承晓, 周建平
(安徽省公共气象服务中心)
Comparative analysis of two freezing rain processes in southern Anhui Province
Wang Chuanhui, Yao Yeqing, Miao Kaichao, Yao Zhenhai, Liu Chengxiao, Zhou Jianping
(Anhui Public Meteorological Service Center,Hefei,230031)
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投稿时间:2018-07-22    修订日期:2019-12-27
中文摘要: 基于逐时气象观测资料和一日4次ERA-Interim再分析资料对2018年1月4-7日(第一次过程)和24-27日(第二次过程)安徽省南部两次降水过程中冻雨分布、时间演变及环流特征进行分析,结果表明:1)从冻雨发生范围上看,第一次过程只有安徽南部海拔高于400m的站点出现冻雨,低海拔地区未观测到冻雨;第二次过程出现了区域性的冻雨。2)通过自动气象观测仪器的风速突然降为0、风向固定不动可大致推测出冻雨出现时间,比人工观测到冻雨出现时间早。3)两次冻雨天气出现均是在准静止锋天气下出现的,但导致冻雨形成的机制不同。第一次过程为典型的“冰相融化”机制,第二次过程为典型的“过冷暖雨”机制。4)东亚大陆近地面冷高压使两次冻雨天气中安徽南部处在东北气流之下,其带来的冷温度平流形成近地面到地面的冷垫,而750hPa高度附近南支槽槽前暖湿气流带来暖温度平流是融化层或逆温层维持和发展主要原因。
中文关键词: 冻雨  天气过程  安徽省  环流特征
Abstract:The freezing rain distribution, time evolution and its circulation characteristics of the two precipitation processes in southern Anhui Province during day 4-day 7 and day 24-day 27 in January 2018 were analyzed based on the day by day meteorological observation data and ERA-Interim reanalysis data four times per day. Results show that: 1) The spatial range of freezing rain reflects the process during day 4-day 7 in January occurred only south of Anhui province above 400m, while it was not observed at lower altitude. Regional freezing rain occurred during day 24- day 27 in January. 2) We evaluated the time of the freezing rain approximately by the sudden drop of wind speed to 0m/s and the fixed wind direction from the automatic meteorological stations, which is earlier than human observation results. 3) The two processes appeared in the quasi static weather, but the mechanism differs. The process during day 4- day 7 in January belongs to typical "ice melting" mechanism, while the process during day 24- day 27 in January belongs to typical "super-cold warm rain" mechanism. 4) The surface cold high in the East Asian continent makes the south of Anhui under the northeastern wind during two freezing rain processes. The cold advection of the northeastern wind develops a cold cushion from near the ground to the ground, and the warm advection from the warm wet air in front of the southern branch trough near 750hPa is the main reason for the maintenance and development of the thawing or the inversion layer.
文章编号:201807220317     中图分类号:P457    文献标志码:
基金项目:安徽省气象局预报员专项(kY201607)
引用文本:
王传辉,姚叶青,苗开超,姚镇海,刘承晓,周建平,0.[en_title][J].Meteor Mon,():-.
Wang Chuanhui,Yao Yeqing,Miao Kaichao,Yao Zhenhai,Liu Chengxiao,Zhou Jianping,0.Comparative analysis of two freezing rain processes in southern Anhui Province[J].Meteor Mon,():-.