J4 ›› 2011, Vol. 29 ›› Issue (1): 62-68.

• 论文 • 上一篇    下一篇

河北省廊坊市一次初冬雨转暴雪天气过程分析

王清川1,2寿绍文1霍东升2
  

  1. 1.南京信息工程大学大气科学学院,江苏南京210044;   2.河北省廊坊市气象局,河北廊坊065000.
  • 收稿日期:2010-10-28 修回日期:2010-11-01 出版日期:2011-03-31 发布日期:2011-03-31
  • 作者简介:王清川(1978-),男,工程师,主要从事短期天气预报和气候研究.E-mail:hblfwqc@163.com
  • 基金资助:

    国家自然科学青年基金“中国降水日变化的数值模拟及误差分析”(40805041)资助

Analysis on Causes of a Rain to Heavy Snowstorm in Early Winter in Langfang of Hebei Province

WANG Qingchuan1,2,SHOU Shaowen1,HUO Dongsheng2   

  1. 1.College of Atmospheric Sciences,Nanjing University of Information Science and Technology,Nanjing 210044,China; 2.Langfang Meteorological Bureau of Hebei Province,Langfang 065000,China.
  • Received:2010-10-28 Revised:2010-11-01 Online:2011-03-31 Published:2011-03-31

摘要:

利用Micaps常规资料、新一代多普勒雷达资料、自动站资料,对2009年10月31日至11月1日河北省廊坊市出现的一次雨转大到暴雪天气过程的环流背景、物理量场和雷达资料进行综合分析。结果表明:500 hPa西来低槽、700 hPa和850 hPa切变、地面倒槽等影响系统共同作用造成了廊坊市大到暴雪天气,此次降水过程是一次比较典型的华北回流降水天气过程。低空从渤海海面的水汽输送是造成本次大到暴雪天气降水过程的重要水汽源。底层强烈的辐合造成了较强的上升速度,导致强降雪发生。暖平流高度和回波顶高度的抬升可作为降雪增强的判据之一。北京多普勒天气雷达上0℃层亮带高度迅速下降后1~2 h内,即可以推断廊坊降水相态将由雨转为雪。

关键词: 暴雪, 天气形势, 物理量分析, 多普勒雷达

Abstract:

Based on the conventional data of Micaps and Doppler radar data,the rain to heavy snowfall event occurred in Langfang from 31 October to 1 November 2009 has been analyzed.The results show that the major influencing system of this heavy snowfall was the 500 hPa trough,wind shear line at the level of 700 hPa and 850 hPa,the inverse trough at ground level.And this snowstorm weather was a typical backflow over north China process.Vapor transportation from Bohai was the important source of steam for this snowfall.The strong convergence at the lower level resulted in strong ascending motion.The rise of the height of warm advection and echo tops would be one of criterions for snow enhancement.According to the echo characteristics of Doppler radar in Beijing,after 1-2 hours of the height of the 0℃layer bright band decreases quickly,it could be concluded that rainfall weather would change into snowfall weather in Langfang of Hebei Province.

Key words: snowstorm, weather situation, physical quantity analysis, doppler radar

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