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暴雨灾害
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暴雨灾害  2019, Vol. 38 Issue (2): 169-176    DOI: 10.3969/j.issn.1004-9045.2019.02.009
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2018年初豫南特大暴雪过程的特征与成因分析
崔慧慧1, 苏爱芳2
1. 河南省郑州市气象台, 郑州 450005;
2. 河南省气象台, 郑州 450003
Analysis on characteristics and causes of a heavy snowstorm event in southern Henan in the beginning of January 2018
CUI Huihui1, SU Aifang2
1. Zhengzhou Meteorological Observatory, Zhengzhou 450005;
2. Henan Meteorological Observatory, Zhengzhou 450003
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摘要 利用常规观测资料及NCEP/NCAR 1°×1°逐6 h再分析资料,分析了2018年初豫南特大暴雪过程的特征与成因。结果表明:此次特大暴雪过程发生在500 hPa乌拉尔山以东地区阻塞高压稳定维持和中、高纬地区多支短波槽东移并同位相叠加的环流背景下,具有持续时间长、过程降雪量大、降雪强度大、积雪深等特征;强降雪阶段,对流层低层豫南地区同时存在两个水汽来源,一是700 hPa西南急流对孟加拉湾水汽的输送,二是850 hPa东南气流对东海南部水汽的输送;低层较强的水汽输送及辐合、贯穿整个对流层的湿层、维持较高的比湿和整层可降水量对暴雪的形成与持续有一定的指示意义;低空冷垫有利于逆温层之上西南暖湿气流在其上爬升,低空垂直风切变的变化对降雪强度变化有较好的指示意义;高空急流先于低空西南急流而建立,高空急流轴南压使得低空急流发展北上,高低空急流耦合激发次级环流圈上升支,为暴雪发生发展提供了强烈的上升运动;对流层低层700 hPa与850 hPa持续强烈锋生,有利于暴雪加强和持续。
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崔慧慧
苏爱芳
关键词特大暴雪   短波槽   水汽输送   急流   锋生     
Abstract: Based on conventional observation data and NCEP/NCAR 6-hour reanalysis data with 1°×1° resolution, we analyzed the characteristics and causes of a heavy snowstorm event in southern Henan in the beginning of January 2018. The results show that this event, which is characterized by long duration, more total snowfall, large precipitation intensity and deep snow cover, occurred under a circulation environment of the stable maintenance of blocking high in eastern part of Ural Mountains in 500 hPa with multiple short wave troughs moving westward and superposing in same phase in the mid- and high- latitudes. During the severe snowfall period of this event, there are two sources supplying water vapor to southern Henan in the lower troposphere, i.e., the water vapor transported by 700 hPa southwest jet from the Bay of Bengal and by 850 hPa southeast airflow from the south of the East China Sea, respectively. The intensive transportion and convergence of water vapor in the low-level, the wet layer through whole troposphere and the continuance of high specific humidity and whole layer precipitable water are of good indicative for the origination and continuance of snowstorm. The cold cushion in the low-level is helpful for southwest warm and wet airflow climbing above the inversion layer, and the variation of vertical wind shear in the low-level is a better indication for the change of snowfall intensity. The establishment of the high-level jet stream precedes that of southwesterly low-level jet. The southward movement of high-level jet axis makes the low-level jet develop northward, and the coupling of the high-level jet and the low-level jet stimulates the ascending branch of the secondary circulation, which provides the intensive ascending movement for the occurrence and development of snowstorm. The frontogenesis in 700 hPa and 850 hPa in the lower troposphere is conducive to the strengthening and continuation of snowstorm.
Key wordsheavy snowstorm   short wave trough   water vapor transport   jet   frontogenesis   
收稿日期: 2018-10-10;
基金资助:

中国气象局预报员专项(CMAYBY2016-042)

通讯作者: 苏爱芳,主要从事短期天气预报技术与方法研究。E-mail:afsu011@sohu.com   
作者简介: 崔慧慧,主要从事短期天气预报业务及研究工作。E-mail:huihuismile2008@126.com
引用本文:   
崔慧慧, 苏爱芳 .2019. 2018年初豫南特大暴雪过程的特征与成因分析[J]. 暴雨灾害, 38(2): 169-176.
CUI Hui-Hui, SU Ai-Fang .2019. Analysis on characteristics and causes of a heavy snowstorm event in southern Henan in the beginning of January 2018[J]. Torrential Rain and Disasters, 38(2): 169-176.
 
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