持續(xù)拉伸型中尺度對(duì)流系統(tǒng)發(fā)生發(fā)展與江蘇暴雨分析

doi:10.3969/2013jms.0022

首頁 > 過刊瀏覽>2013年第33卷第5期 >561-569. DOI:10.3969/2013jms.0022

持續(xù)拉伸型中尺度對(duì)流系統(tǒng)發(fā)生發(fā)展與江蘇暴雨分析
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                        10.3969/2013jms.0022
                    
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基金項(xiàng)目:江蘇省重大科技支撐與自主創(chuàng)新示范工程項(xiàng)目(BE2008618)

Analysis on persistent elongated convective systems and torrential rains in Jiangsu

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利用自動(dòng)氣象站、衛(wèi)星探測(cè)資料,NCEP/NCAR 1°×1°再分析資料等,從環(huán)流特征,動(dòng)力、熱力和水汽條件等對(duì)發(fā)生在江蘇地區(qū)的兩次梅汛期大暴雨過程的中尺度對(duì)流云團(tuán)的發(fā)生、發(fā)展進(jìn)行了分析。結(jié)果表明:這兩次中尺度對(duì)流云團(tuán)中均存在持續(xù)伸長(zhǎng)型的中尺度對(duì)流系統(tǒng)(PECS),大暴雨區(qū)與T_BB<-70 ℃區(qū)域有較好的對(duì)應(yīng)關(guān)系,有利的環(huán)境場(chǎng)形成的高空輻散、低空輻合和強(qiáng)烈的上升運(yùn)動(dòng)是PECS發(fā)生發(fā)展的重要條件。PECS云團(tuán)處于200 hPa高空急流入口區(qū)右側(cè)、西南低空急流左側(cè)(切變線南側(cè)),呈西南—東北向線狀排列,低層暖濕不穩(wěn)定氣流誘發(fā)中尺度云團(tuán)的產(chǎn)生,氣旋性渦度場(chǎng)對(duì)積云對(duì)流活動(dòng)具有組織和增強(qiáng)作用。當(dāng)正渦度向垂直方向發(fā)展時(shí),附近產(chǎn)生強(qiáng)烈的垂直上升運(yùn)動(dòng),對(duì)應(yīng)著中尺度PECS云團(tuán)的強(qiáng)烈發(fā)展。強(qiáng)烈的對(duì)流不穩(wěn)定有利于中尺度對(duì)流系統(tǒng)的發(fā)展,也有利于觸發(fā)暴雨產(chǎn)生。

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By using intensive observation data from automatic meteorological stations, NCEP/NCAR global 1°× 1° reanalysis data,satellite sounding data, etc, the genesis and evolution of the meso-scale convective cloud clusters which lead to the two torrential rains in the central of Jiangsu are analyzed in this paper. The result shows there exists persistent elongated meso-scale convective system (PECS) in the two meso-scale convective cloud clusters. Torrential rain areas tend to match with the areas with TBB below -70 ℃, and the lower the TBB is, the stronger the precipitation is; the high-level divergence, low-level convergence and strong ascending motion provide favourable important conditions for the meso-scale PECS growth. The PECS cloud clusters are located in the right side of the entrance of the jet stream at 200 hPa, and in the left side of the jet stream in lower layer (the south of the shear line), along the direction from southwest to northeast. The instable warm moist current in lower layer triggers the genesis of meso-β PECS cloud clusters,and the cyclonic vorticity builds up the cumulus convective activity. Moreover, the accumulation of vapor and instable energy are the important power source of the meso-scale PECS cloud clusters. The strong development of meso-scale PECS cloud cluster is caused by the strong vertical motion because of the vertical development of the vertical vortex nearby. The stratified instability of atmosphere helps develop meso-scale convective system and leads to torrential rain.

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張雪蓉,濮梅娟,李曉容,覃丹宇,張備.持續(xù)拉伸型中尺度對(duì)流系統(tǒng)發(fā)生發(fā)展與江蘇暴雨分析.氣象科學(xué),2013,33(5):561-569 ZHANG Xuerong, PU Meijuan, LI Xiaorong, QIN Danyu, ZHANG Bei. Analysis on persistent elongated convective systems and torrential rains in Jiangsu. Journal of the Meteorological Sciences,2013,33(5):561-569

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收稿日期:2012-03-14
最后修改日期:2012-12-12
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在線發(fā)布日期: 2013-10-31
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