2008年河南黃淮地區(qū)暴雨過程個例分析

doi:10.3969/2012jms.00**

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2008年河南黃淮地區(qū)暴雨過程個例分析
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                        10.3969/2012jms.00**
                    
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Case analysis of a heavy rainfall event between Yellow River and Huaihe River area of Henan in 2008

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摘要:

利用常規(guī)氣象資料和NCEP資料對2008年7月22日河南黃淮地區(qū)的暴雨過程進行了分析。結(jié)果表明：這次過程是在500 hPa槽前西南氣流引導(dǎo)下，高低空急流耦合區(qū)內(nèi)西南渦沿切變線移出，弱冷空氣侵入暖倒槽觸發(fā)不穩(wěn)定能量釋放造成的。垂直螺旋度計算結(jié)果顯示：中低層正垂直螺旋度中心與降水落區(qū)有很好的對應(yīng)關(guān)系，大暴雨中心位于正垂直螺旋度中心附近。濕位渦演變分析發(fā)現(xiàn)，這次過程有“干侵入”發(fā)生，暴雨區(qū)中低層對流不穩(wěn)定和對稱不穩(wěn)定共存，有利于降水增幅。水汽條件分析表明：這次過程的水汽源地在孟加拉灣和南海，主要是低層和近地層的水汽輻合。

Abstract:

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 interact 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 helicity 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 lower-level.

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胡燕平,單鐵良,殷廣亞,馬月枝,姬鴻麗.2008年河南黃淮地區(qū)暴雨過程個例分析.氣象科學(xué),2009,(6):821-826 Hu Yanping, Shan Tieliang, Yin Guangya, Ma Yuezhi, Ji Hongli. Case analysis of a heavy rainfall event between Yellow River and Huaihe River area of Henan in 2008. Journal of the Meteorological Sciences,2009,(6):821-826

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收稿日期:2008-08-29
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