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

气象与环境学报

• 论文 •    下一篇

冀南一次大到暴雪天气过程分析

宋晓辉1,2;王咏青1;寿绍文1;王爱君3;田秀霞2;李菊香2   

  1. 1. 南京信息工程大学，江苏 南京 210044;2. 邯郸市气象局，河北 邯郸 056001;3. 唐山市丰南区气象局，河北 唐山 063300
  • 收稿日期:2010-07-16 修回日期:2010-09-07 出版日期:2010-10-29 发布日期:2010-10-29

Analysis of a heavy snow process in southern Hebei province

SONG Xiao-hui1,2;WANG Yong-qing1;SHOU Shao-wen1;WANG Ai-jun3;TIAN Xiu-xia2;LI Ju-xiang2   

  1. 1. Nanjing University of Information Science & Technology, Nanjing 210044, China; 2. Handan Meteorological Bureau, Handan 056001, China; 3. Meteorological Bureau in Fengnan District of Tangshan, Tangshan 063300, China
  • Received:2010-07-16 Revised:2010-09-07 Online:2010-10-29 Published:2010-10-29

PDF (PC)

669

摘要：

利用NCEP再分析资料和常规观测资料，对2001年1月6日冀南大到暴雪过程进行分析。结果表明：偏南暖湿气流在东北南下的冷垫上爬升是降雪发生与维持的有利条件；暴雪过程以回流降雪为主，后期为西来槽降雪；暴雪发生时，有较强的上升运动和较大的水汽输送与辐合，高层辐散低层辐合，中低层正涡度的发展尤其是正涡度平流的增强为暴雪过程提供了动力条件；偏南风急流为暴雪区提供了充沛的水汽和能量；非地转湿Q矢量散度的辐合区与降雪区对应；低层高能舌的演变可以大致判断强降水出现的时间和位置；在回流降雪阶段出现对流不稳定。

关键词: 暴雪过程, 高空急流, 上升运动, 湿Q矢量

Abstract: Based on the conventional meteorological data and reanalysis data from NCEP, the heavy snow process on January 6, 2001 was analyzed. The results show that the south warm and humid airflow climbing along the southward cold air cushion is favorable to snowfall. Backflow snowfall is the main in this snow, while snowfall from west trough is the main in the late of this snow. It will have the strong ascending motion and plenty of water vapor transport and convergence when the heavy snow happens. The development of high level divergence and low level convergence together with positive vorticity in the middle and low level could provide dynamic conditions for the heavy snow, especially the concentration of positive vorticity advection. The southerly jet could afford abundant water vapor and energy for snowfall. Convergence area of ageostrophic wet Q-vector is accorded with snowfall area. Evolvement of the low level high energy tongue could determine the time and position of strong precipitation approximately. Convective instability appears at the stage of backflow snowfall.

中图分类号: