主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

气象与环境学报 ›› 2023, Vol. 39 ›› Issue (6): 10-17.doi: 10.3969/j.issn.1673-503X.2023.06.002

• 论文 • 上一篇    下一篇

2021年11月6—9日辽宁省极端暴雪过程诊断分析

赵婷婷1(),孟鑫2,高凌峰3,周泽文1,刘海龙1,高晶1   

  1. 1. 辽阳市气象局, 辽宁辽阳 111000
    2. 丹东市气象局, 辽宁丹东 118000
    3. 雄安新区气象局, 河北雄安新区 071700
  • 收稿日期:2023-02-09 出版日期:2023-12-28 发布日期:2024-01-27
  • 作者简介:赵婷婷, 女, 1989年生, 工程师, 主要从事中短期天气预报工作, E-mail: zhaott08@163.com
  • 基金资助:
    中国气象局沈阳大气环境研究所东北冷涡研究开放重点实验开发课题(2020SYIAE09)

Diagnosis and analysis of the extreme blizzard in Liaoning province from 6 to 9, November, 2021

Tingting ZHAO1(),Xin MENG2,Lingfeng GAO3,Zewen ZHOU1,Hailong LIU1,Jing GAO1   

  1. 1. Liaoyang Meteorological Service, Liaoyang 111000, China
    2. Dandong Meteorological Service, Dandong 118000, China
    3. Xiong'an Meteorological Service, Xiong'an 071700, China
  • Received:2023-02-09 Online:2023-12-28 Published:2024-01-27

摘要:

选用常规气象观测资料和NCEP 1°×1°再分析资料, 对2021年11月6—9日辽宁省极端暴雪过程进行天气形势和物理量诊断分析。结果表明: 此次极端暴雪过程主要受东北冷涡和强气旋共同影响, 最大降雪量为80.8 mm, 有20个站最大积雪深度超过30 cm。导致极端暴雪的主要原因是持续时间较长的强水汽输送和水汽辐合, 最大值分别为18 g·hPa-1·s-1·cm-1和-7×10-5 g·hPa-1·cm-2·s-1; 异常偏强的低层辐合、高层辐散产生的强上升运动, 中心值达到-3.0 Pa·s-1, 对极端性暴雪预报有指示作用。斜压强迫和850 hPa强烈的水平锋生是此次极端降雪发生发展的重要机制。湿位涡MPV1>0且MPV2 < 0的配置表明, 气旋性涡度及对称不稳定性的增大为暴雪过程的发生提供了有利条件。

关键词: 东北冷涡, 水汽辐合, 上升运动, 斜压性, 湿位涡

Abstract:

Using the conventional meteorological observational data and 1°×1° reanalysis data from the NCEP (National Centers for Environmental Prediction), the weather situation and physical quantity diagnosis and analysis of the extreme blizzard process in Liaoning province from 6 to 9, November, 2021 were carried out.The results show that the extreme blizzard process is mainly affected by the Northeast cold vortex and strong cyclone, the maximum snowfall is 80.8 mm, and the maximum snow depth measured at 20 stations exceeds 30 cm.The main cause of extreme blizzard is the long duration of strong water vapor transport and water vapor convergence, with the maximum values of 18 g·hPa-1·s-1·cm-1 and -7×10-5 g·hPa-1·cm-2·s-1, respectively.The strong ascending motion produced by abnormally strong convergence at the low level and divergence at the high level, with a central value of -3.0 Pa·s-1, is indicative of an extreme blizzard forecast.The baroclinic forcing and strong horizontal frontogenesis at 850 hPa are important mechanisms for the occurrence and development of this extreme snowfall event.The configuration of the moist potential vortex, with MPV1>0 and MPV2 < 0 indicates that the increase of cyclonic vorticity and symmetric instability provides favorable conditions for the occurrence of the blizzard process.

Key words: Northeast cold vortex, Water vapor convergence, Upward motion, Baroclinicity, Moist potential vortex

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