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 ›› 2017, Vol. 33 ›› Issue (1): 12-18.doi: 10.3969/j.issn.1673-503X.2017.01.002

• 论文 • 上一篇    下一篇

辽宁地区一次暴雪过程低涡增强机制分析

田莉1, 阎琦1, 陆井龙1, 陈妮娜2   

  1. 1. 辽宁省气象台, 辽宁 沈阳 110166;
    2. 辽宁省气象灾害监测预警中心, 辽宁 沈阳 110166
  • 收稿日期:2015-09-09 修回日期:2016-04-14 出版日期:2017-02-28 发布日期:2017-02-28
  • 通讯作者: 阎琦,E-mail:yq.mete@163.com。 E-mail:yq.mete@163.com
  • 作者简介:田莉,女,1985年生,工程师,主要从事短期天气预报研究,E-mail:tianli_2015@sina.com。
  • 基金资助:
    辽宁省科技厅农业攻关及成果产业化项目(2014210003)、中国气象局预报员专项(CMAYBY2015-017、CMAYBY2016-015)、辽宁省气象局科研项目“华北气旋类暴雪形成机理研究”(201501)和辽宁省气象局乡镇预报创新团队项目共同资助。

The enhancement mechanism analysis of low vortex in a snowstorm over Liaoning province

TIAN Li1, YAN Qi1, LU Jing-long1, CHEN Ni-na2   

  1. 1. Liaoning Meteorological Observatory, Shenyang 110016, China;
    2. Liaoning Meteorological Disaster Monitoring and Early Warning Centre, Shenyang 110166, China
  • Received:2015-09-09 Revised:2016-04-14 Online:2017-02-28 Published:2017-02-28

摘要: 利用常规气象观测资料和NCEP/NCAR再分析资料,对2015年2月15—17日辽宁省东北部地区一次暴雪天气过程的低涡增强机制进行了分析。结果表明:辽宁地区此次暴雪过程中850 hPa低涡增强最明显,绝对涡度平流项是高层正涡度变率的主要强迫项,散度项则是低层正涡度变率的主要强迫项;500 hPa冷平流增强强迫高层正涡度变率发展,造成涡度在垂直方向上分布不均匀,差动涡度平流增大,垂直上升运动加强,低层辐合加强,使低层涡度增强,低层低涡系统发展,低层低涡系统发展使干冷的西北气流、东北气流和来自黄海北部的东南暖湿气流在辽宁中部地区汇合,降雪加强。

关键词: 暴雪, 低涡, 涡度变率, 散度

Abstract: Based on conventional meteorological observational data and NCEP/NCAR (National Centers for Environmental Prediction/National Center for Atmospheric Research) reanalysis data,the enhancement mechanism of the low vortex in a snowstorm from February 15 to 17,2015 over the northeast of Liaoning province is analyzed.The results show the enhancement of low vortex at 850 hPa is the most obvious during the snowstorm event.The absolute vorticity advection term is the major forcing source for the positive vorticity tendency in the upper levels,and the divergence term is the main forcing source for the positive vorticity variability in the lower levels.The enhancement of cold advection at 500 hPa forces the development of positive vorticity variability in the upper levels,resulting in the heterogeneous vertical distribution of vorticity,the increasing differential vorticity advection,the enhancement of vertical ascending motion,and the strong convergence in lower levels.The development of low vortex system in the lower levels results in the convergence of dry and cold northwesterly and northeasterly flows and warm and wet southeasterly flows from the north Yellow Sea over the central region of Liaoning province,which strengthens the snowfall.

Key words: Snowstorm, Low vortex, Vorticity variability, Divergence

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