大连地区2009年12月29～30日寒潮天气过程分析

利用常规天气资料和数值预报产品,应用天气分析和诊断分析方法,对大连南部地区2009年12月29～30日出现的寒潮天气进行分析。结果表明,在前期升温的基础上,有强冷空气在蒙古国堆积并经乌兰巴托、二连浩特,侵袭大连地区造成的;寒潮过程亚洲中高纬环流形势为＂一脊一槽＂型,动力机制为高空旋转低压槽与强锋区,促使寒潮暴发的流场为＂低槽旋转型＂;冷空气暴发后,大连地区上空由强盛的冷平流控制,地面冷高压进入关键区并达到寒潮强度,但由于寒潮发生的环流偏南、影响系统及冷空气移动较快,因此,大连南部地区,旅顺、大连、金州三站出现寒潮。在此基础上,总结出大连地区寒潮天气的预报着眼点。

Analysis of the Cold Wave Weather Process in Dalian during December 29th-30th of 2009

Based on the daily observation data and numerical forecast products,using synoptic and diagnostic analysis methods,a cold wave process during December 29th-30th of 2009 was analyzed in south of Dalian.The results showed that,based on the warming strongly before the twice cold wave,strong cold air was accumulated in Mongolia and after Ulan Bator,Erenhot and broke out in Dalian.The circulation pattern showed a trough and a ridge at middle and high latitudes in Asia,dynamic mechanism was an upper rotating low-...