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暴雨灾害  2018, Vol. 37 Issue (5): 410-420    DOI: 10.3969/j.issn.1004-9045.2018.05.003
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2018年1月底至2月初贵州低温雨雪天气成因初探
甘文强1, 蓝伟2, 杜小玲1, 朱文达1, 齐大鹏1, 唐磊1, 胡亚文3
1. 贵州省气象台, 贵阳 550002;
2. 贵州省气象局, 贵阳 550002;
3. 贵州省盘州市气象局, 盘州 553537
Tentative analysis on the cause of a low-temperature, freezing rain and snow event in Guizhou between the end of January and the beginning of February in 2018
GAN Wenqiang1, LAN Wei2, DU Xiaoling1, ZHU Wenda1, QI Dapeng1, TANG Lei1, HU Yawen3
1. Guizhou Meteorological Observatory, Guiyang 550002;
2. Guizhou Meteorological Bureau, Guiyang 550002;
3. Panzhou Meteorological station of Guizhou Province, Panzhou 553537
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摘要 2018年1月24日夜间至2月5日贵州出现低温雨雪天气。通过分析其特点,将该过程分为三个阶段,即中东部冻雨主导期、中西部弱雨雪期和中西部降雪发展期。本文利用常规观测资料和美国国家环境预报中心(NCEP)FNL 1°×1°再分析资料,对这一阶段的低温雨雪天气成因开展了分析,并基于观测要素统计结果构建上述三个阶段的探空模型。结果表明:(1)在三个阶段,亚洲中高纬度表现出不同的环流形势,分别出现了乌山阻塞形势、横槽转竖、两槽一脊形势;(2)4次强冷空气影响及静止锋西推是贵州自东向西出现低温雨雪天气的重要原因;(3)前期暖层与高湿区、后期冷区与高湿区的温湿特征造成不同相态降水,29日前有效降水促进了结冰较快增长;(4)三个阶段探空模型显示,不同相态降水均是静止锋后冷气团一侧锋面降水造成的结果,温度层结、湿层高度、逆温梯度、云顶温度、逆温底温度与地面温度对不同降水相态的形成具有重要影响。
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甘文强
蓝伟
杜小玲
朱文达
齐大鹏
唐磊
胡亚文
关键词低温   降雪   冻雨   静止锋   降水相态   探空模型   贵州     
Abstract: A low-temperature, freezing rain and snow event occurred in Guizhou from the nocturnal of 21 January to 5 February in 2018. This event can be divided into three stages, namely, freezing rain-predominated period in central and eastern Guizhou, light rain and snow period in central and western Guizhou, and snowfall-developing period in central and western Guizhou. Using datasets of conventional observations and NCEP FNL reanalysis grid data with 1°×1° resolution, we have conducted a causality analysis on the low-temperature, freezing rain and snow during the three stages of this event, and established three sounding models for freezing rain, weak rain and snow, and snow based on statistics of the observations. The main results are as follow. (1) In the three stages, there are different circulation patterns in the middle-high latitudes, i.e., emerging the Ural blocking high, the meridianal revising of the zonal trough and the two troughs and one ridge pattern, respectively. (2) The influence of four strong cold air processes and the westward movement of the stationary front are the important reasons that low-temperature, freezing rain and snow weather happened from east to west of Guizhou. (3) The precipitation phase is in coherence with the different temperature and humidity characteristics of being warm and humid before and cold and humid after this event, and the efficient precipitation promotes the rapid growth of ice before 29 January 2018. (4) Sounding models in the three stages show that all the different phased precipitation is caused by frontal precipitation occurred in the side of the cold air mass behind the stationary front. Many factors, such as temperature stratification, the height of the wet layer, the inversion gradient, the temperature of the cloud top, the temperature at the inversion bottom and the ground temperature, have important influence on the formation of different precipitation phases.
Key wordslow-temperature   snow   freezing rain   stationary front   precipitation phase   sounding model   Guizhou   
收稿日期: 2018-02-11;
基金资助:

贵州省重大业务专项(黔气科合ZD[2016]01号);国家自然科学基金项目(41565001)

通讯作者: 杜小玲,主要从事天气预报及冻雨、暴雨等极端天气研究。E-mail:13985141480@163.com   
作者简介: 甘文强,主要从事天气预报及服务工作。E-mail:qxjgkz@sina.com
引用本文:   
甘文强, 蓝伟, 杜小玲,等 .2018. 2018年1月底至2月初贵州低温雨雪天气成因初探[J]. 暴雨灾害, 37(5): 410-420.
GAN Wen-Qiang, 蓝Wei , DU Xiao-Ling, et al .2018. Tentative analysis on the cause of a low-temperature, freezing rain and snow event in Guizhou between the end of January and the beginning of February in 2018[J]. Torrential Rain and Disasters, 37(5): 410-420.
 
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