2011年江蘇南部?jī)蓤?chǎng)大暴雨對(duì)比分析

doi:10.3969/2014jms.0019

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2011年江蘇南部?jī)蓤?chǎng)大暴雨對(duì)比分析
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                        10.3969/2014jms.0019
                    
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基金項(xiàng)目:中國(guó)氣象局預(yù)報(bào)員專項(xiàng)(CMAYBY2014-024);公益性行業(yè)(氣象)科研專項(xiàng)(GYHY201306008;GYHY201506006;GYHY201306010);江蘇省氣象科研開放基金項(xiàng)目(KZ201407,KZ201102)

Comparative analysis on two torrential rains in southern Jiangsu of 2011

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利用高分辨率的加密氣象自動(dòng)站資料、FY2D衛(wèi)星資料、多普勒雷達(dá)資料、常規(guī)觀測(cè)資料以及6 h 1次的NCEP再分析資料等,對(duì)2011年6月18日和2011年7月18日江蘇地區(qū)分別發(fā)生在梅雨期開始階段和結(jié)束階段的兩場(chǎng)暴雨進(jìn)行中尺度天氣系統(tǒng)演變和雷達(dá)回波參數(shù)等特征的對(duì)比分析。結(jié)果表明:(1)6月18日的天氣形勢(shì)是典型的梅雨期降水形勢(shì),在梅雨鋒附近產(chǎn)生了區(qū)域性暴雨。水汽輸送主要是對(duì)流層中低層的西南暖濕氣流。7月18日的局地暴雨則是出現(xiàn)在低壓倒槽頂端右側(cè)的偏東氣流中。(2)兩次暴雨過程強(qiáng)降水發(fā)生前都存在對(duì)流層低層輻合快速增強(qiáng)的過程。7月18日暴雨強(qiáng)降水發(fā)生前散度值下降則更為迅速。(3)兩次暴雨過程中強(qiáng)降水區(qū)都出現(xiàn)在地面輻合系統(tǒng)附近的東北氣流中,且隨著地面輻合系統(tǒng)移動(dòng)。(4)兩次暴雨過程都出現(xiàn)了T_BB低于-62℃的強(qiáng)對(duì)流云團(tuán)。(5)6月18日,與多個(gè)線性排列的"逆風(fēng)區(qū)"對(duì)應(yīng)的強(qiáng)回波中心形成了"列車效應(yīng)";7月18日,對(duì)流回波帶上單體不斷流入,在低空急流左前端合并成團(tuán)狀強(qiáng)對(duì)流區(qū),分別是形成兩次暴雨的重要原因。

Abstract:

By using auto-weather station network data with high resolution, FY2D satellite data,Doppler radar data and 6 h NECP reanalysis data, the comparison analysis on the mesoscale weather system evolution and radar echo parameters of two torrential rain events occurred in Jiangsu on June 18 and July 18,2011 was conducted . The results show that:(1) the weather situation on June 18 was the typical Meiyu precipitation, which represented the regional torrential rain occurring near the Meiyu front. The southwest warm and wet airflow provided the water vapor transportation. The local torrential rain on July 18 appeared in the east airflow on the right side of inverted trough. (2) The convergence in lower troposphere increased quickly before the two rainstorm processes and divergence value on July 18 declined more rapidly. (3) Heavy rain areas were both in northeast air flow near the surface convergence system, and moved together with the convergence system. (4) The strong convective cloud with <-62℃ T_BB appeared in two rainstorm processes. (5) On June 18, the "train effect" was formed by strong echo center corresponding to plurality of linearly arranged "inverse wind regions", and on July 18, the continously flowing monomers in convection echo belt merged into the cluster of convection zone in the left front of low level, these two factors were the important reasons causing the torrential rain.

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王嘯華,鄭媛媛,徐芬,李楊,侯俊.2011年江蘇南部?jī)蓤?chǎng)大暴雨對(duì)比分析.氣象科學(xué),2015,35(4):497-505 WANG Xiaohua, ZHENG Yuanyuan, XU Fen, LI Yang, HOU Jun. Comparative analysis on two torrential rains in southern Jiangsu of 2011. Journal of the Meteorological Sciences,2015,35(4):497-505

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收稿日期:2013-12-12
最后修改日期:2014-04-15
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在線發(fā)布日期: 2015-09-11
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