CAJ | 학술논문

引入垂直能量螺旋度指数（VEH）的概念并分析其物理意义,同时采用NCEP 1°×1°再分析资料和MICAPS重要天气报文资料,将该指数应用于2009年7月4—7日华北地区一次槽前型雷暴大风过程的预报中;在此基础上,利用华北地区2008—2009年夏季4次槽前型雷暴大风个例,对该指数的普适性进行验证。结果表明,该指数反映了气块在螺旋上升过程中释放不稳定能量的能力,是诊断和预报槽前型雷暴大风的有效指数;并将该指数应用于一次华北典型槽前型雷暴大风的预报中,通过对比其它指数,证明其有效;用14时的VEH指标,预报20时前的雷暴大风天气,这种天气一般在VEH超过1.4 J.m.kg-.1s-2的3～6 h之间出现。
인입수직능량라선도지수（VEH）적개념병분석기물리의의,동시채용NCEP 1°×1°재분석자료화MICAPS중요천기보문자료,장해지수응용우2009년7월4—7일화북지구일차조전형뇌폭대풍과정적예보중;재차기출상,이용화북지구2008—2009년하계4차조전형뇌폭대풍개례,대해지수적보괄성진행험증。결과표명,해지수반영료기괴재라선상승과정중석방불은정능량적능력,시진단화예보조전형뇌폭대풍적유효지수;병장해지수응용우일차화북전형조전형뇌폭대풍적예보중,통과대비기타지수,증명기유효;용14시적VEH지표,예보20시전적뇌폭대풍천기,저충천기일반재VEH초과1.4 J.m.kg-.1s-2적3～6 h지간출현。
A new concept of vertical energy helicity（VEH） index is proposed,and its physical meaning is explained.In order to prove its effect,by using the NCEP（1°×1°） reanalysis data and the important weather data of MICAPS,the vertical energy helicity index is applied to a thunderstorm in front of trough which took place in the north of China from July 4 to 7 in 2009.Further more,its universality is proved by using four cases taking place in the north of China in summer from 2008 to 2009.The result shows that the vertical energy helicity index can reflect the ability of unstable energy releasing from spiral ascending process and has better superiority in forecasting thunderstorm than other indexes.Generally,if the VEH index is larger than 1.4 J.m.kg-.1s-2at 14：00,a thunderstorm will happen within 3-6 h.