“10.7”安慶特大暴雨及中尺度低渦結(jié)構(gòu)的數(shù)值模擬與分析

doi:10.3969/2012jms.00**

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“10.7”安慶特大暴雨及中尺度低渦結(jié)構(gòu)的數(shù)值模擬與分析
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                        10.3969/2012jms.00**
                    
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基金項(xiàng)目:公益性行業(yè)科研專項(xiàng)(GYHY200906011);國家自然科學(xué)基金項(xiàng)目(40921160382,40905021)

Analysis of mesoscale convective systems in a heavy rain event in Anqing

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采用常規(guī)氣象觀測(cè)、地面加密降水資料、FY-2E衛(wèi)星逐時(shí)T_BB資料以及WRFV3.3高分辨率模式輸出資料,對(duì)2010年7月12—13日安慶罕見特大暴雨過程的中尺度對(duì)流系統(tǒng)的發(fā)生發(fā)展、結(jié)構(gòu)特征及形成原因進(jìn)行了綜合分析。WRFV3.3中尺度非靜力模式很好地模擬了此次切變線暴雨的雨帶走向、幾個(gè)暴雨中心的位置和強(qiáng)度,以及中尺度對(duì)流系統(tǒng)的整個(gè)發(fā)展過程。分析結(jié)果表明:此次特大暴雨是在高層200 hPa強(qiáng)大的南亞高壓穩(wěn)定少動(dòng),中層500 hPa的短波槽的生成、轉(zhuǎn)向和發(fā)展與副高的維持,低層的700 hPa和850 hPa中尺度低渦、切變線以及地面梅雨鋒擾動(dòng)的共同作用下造成的;700 hPa低渦、切變線以及沿切變線相繼生成和強(qiáng)烈發(fā)展的β中尺度對(duì)流系統(tǒng)是這次特大暴雨的直接制造者。細(xì)網(wǎng)格模擬結(jié)果揭示,安慶特大暴雨與850 hPa上的β中尺度對(duì)流系統(tǒng)(MβCS)的生成和強(qiáng)烈發(fā)展直接相關(guān)。該MβCS具有明顯的動(dòng)力—熱力結(jié)構(gòu)特征,顯示:強(qiáng)上升運(yùn)動(dòng)與飽和氣柱的耦合,強(qiáng)散度柱與強(qiáng)渦柱的耦合發(fā)展,強(qiáng)上升運(yùn)動(dòng)與位勢(shì)不穩(wěn)定的耦合發(fā)展,濕靜力不穩(wěn)定與濕對(duì)稱不穩(wěn)定共存。

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An analysis of the mesoscale convective system (MCS) in a heavy rain event on 12 to 13 July 2010 was performed by using the routine and intensive observational data and FY-2E satellite TBB(black body temperature equivalent) on the basis of successful simulation. The heavy rainfall was well simulated, the band character of simulated precipitation was quite similar to the observed one, and the formation,development and evolution of MCS was numerically simulated by using non-hydrostatic version WRFV3.3. The results show that the stable South Asia high at 200 hPa, the short wave trough at 500 hPa,the subtropical high, the mesoscale vortex at 700 hPa and 850 hPa, the shear line and the perturbation of Meiyu front; the vortex at 700 hPa and low vortex with shear line at 700 hPa as well as with successive generation and intensive development of meso-β scale convective systems(MβCS) along the shear line were the direct causes that led to the rarely torrential rain in Anqing. The simulated results by using fine grid revealed that the extraordinarily heavy rainfall in Anqing was in direct relationship with the genesis and intensive development of a MβCS at 850 hPa. This MβCS had obvious dynamic-thermodynamic structural feature: the extremely intensive ascendant motion was intercoupled with saturated air column; the forced intensive divergence column and intensive vorticity column were coupled and developed; the extremely intensive ascendant motion and geopotential instability were coupled and developed; the moist static instability coexisted with the moist symmetric instability.

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王華文,姜勇強(qiáng),陳中一,萬家杰.“10.7”安慶特大暴雨及中尺度低渦結(jié)構(gòu)的數(shù)值模擬與分析.氣象科學(xué),2011,(s1):7-15 WANG Huawen, JIANG Yongqiang, CHEN Zhongyi, WAN Jiajie. Analysis of mesoscale convective systems in a heavy rain event in Anqing. Journal of the Meteorological Sciences,2011,(s1):7-15

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收稿日期:2011-11-02
最后修改日期:2012-02-17
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在線發(fā)布日期: 2012-09-25
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