CAJ | 학술논문

利用常规气象资料和NCEP资料对2008年7月22日河南黄淮地区的暴雨过程进行了分析.结果表明:这次过程是在500 hPa槽前西南气流引导下,高低空急流耦合区内西南涡沿切变线移出,弱冷空气侵入暖倒槽触发不稳定能量释放造成的.垂直螺旋度计算结果显示:中低层正垂直螺旋度中心与降水落区有很好的对应关系,大暴雨中心位于正垂直螺旋度中心附近.湿位涡演变分析发现,这次过程有"干侵入"发生,暴雨区中低层对流不稳定和对称不稳定共存,有利于降水增幅.水汽条件分析表明:这次过程的水汽源地在孟加拉湾和南海,主要是低层和近地层的水汽辐合.
이용상규기상자료화NCEP자료대2008년7월22일하남황회지구적폭우과정진행료분석.결과표명:저차과정시재500 hPa조전서남기류인도하,고저공급류우합구내서남와연절변선이출,약랭공기침입난도조촉발불은정능량석방조성적.수직라선도계산결과현시:중저층정수직라선도중심여강수락구유흔호적대응관계,대폭우중심위우정수직라선도중심부근.습위와연변분석발현,저차과정유"간침입"발생,폭우구중저층대류불은정화대칭불은정공존,유리우강수증폭.수기조건분석표명:저차과정적수기원지재맹가랍만화남해,주요시저층화근지층적수기복합.
Based on the conventional and NCEP (1°× 1°) reanalysis data, the causes of a heavy rainfall event occurred on 22 July, 2008 between Yellow River and Huaihe River area of Henan is diagnosed and analyzed. The results show that the heavy rainfall event is caused by the southwest air current in front of the trough at 500hPa, the southwest vortex moves along the lower-level shear which are located in the intersection region of the upper-level jet and the low-level jet. The cold air and the warm air inter-act between Yellow River and Huaihe River area of Henan, so the unstable energy is released and the heavy rainfall event occurs. The diagnostic results show that the movement direction and intensity transformation of the positive center of the vertical helicity at lower-level match the heavy rainfall regions quite well. The heavy rainfall center lies on the vertical helieity center. The moist potential vorticity analysis indicates that the invasion of dry-cold air from upper-level makes existing of the convectively instability with symmetric stability at lower-level in the meantime, which is advantageous to the precipitation intensity increment. The water vapor condition analysis shows that the vapors mainly come from the Bengal Bay and the South China Sea. The maximum of moisture flux locates in the lower-layer and boundary layer at low-er-level.