一次大范圍暴雨過程的診斷分析

doi:10.3969/2013jms.0089

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一次大范圍暴雨過程的診斷分析
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                        10.3969/2013jms.0089
                    
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基金項(xiàng)目:南通市社會(huì)事業(yè)科技創(chuàng)新與示范計(jì)劃(HS2011019);南通市科技計(jì)劃項(xiàng)目(S2009005)

Diagnostic analysis on a wide range rainstorm process

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用ECMWF 0.75°×0.75°, 6 h間隔再分析資料、地面加密觀測資料、Micaps資料和云圖T_BB資料, 對(duì)2012年8月20日一次大范圍暴雨過程進(jìn)行診斷分析。結(jié)果表明:本次大暴雨過程是在高層急流入口輻散和中低層的低槽切變線的耦合作用以及臺(tái)風(fēng)的間接影響使得低槽系統(tǒng)移動(dòng)緩慢和提供水汽的有利條件下產(chǎn)生的。暴雨帶中水汽主要來源于南海和東海。從等熵位渦、濕位渦和總能量分析說明這次暴雨和大暴雨是在水汽條件充沛條件下, 對(duì)流不穩(wěn)定疊加斜壓不穩(wěn)定和對(duì)稱不穩(wěn)定等共同作用下, 產(chǎn)生暴雨-大暴雨。另外, 南北兩支氣流在暴雨區(qū)強(qiáng)烈輻合(南側(cè)為上升運(yùn)動(dòng), 北側(cè)為下沉運(yùn)動(dòng))也起到了重要作用, 且總能量垂直廓線與雨團(tuán)中心對(duì)流強(qiáng)度和強(qiáng)降水時(shí)段對(duì)應(yīng)較好。低層?xùn)|海東南暖濕氣流和干冷的東北氣流對(duì)本次大范圍暴雨過程的產(chǎn)生起觸發(fā)作用。

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By using the reanalysis data with 6 h interval and 0.75°×0.75° resolution from ECMWF, ground observation data, Micaps and TBB data, a wide range rainstorm process on 20 August, 2012 was diagnostically analyzed. Results showed that the rainstorm occurred in the favourable conditions of the coupling effects combining divergence at jet extrance at high level with the trough shear line at low level, the slow movement of the trough system and the abundant water vapor for the rainstorm belt by the indirect effects of typhoon. The main source of water vapor in the rainstorm belt was from the East China Sea and the South China Sea. Analysis on isentropic potential vorticity, moist potential vorticity and total energy vertical profile showed that in the condition of abundant water vapor, the joint effects of convective instability superimposed with baroclinic instability as well as symmetric instability caused the rainstorm. Furthermore, the south and north air flow converged strongly in the heavy rain area (upward at south side; downward at north side) also played an important role. Vertical profiles of total energy quite well corresponded with the convection strength and strong precipitation periods. The southeast warm air and the dry-cold northeast airflow at low level triggered this wide range rainstorm process.

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陳鐵,羅愛文,徐為根,張樹民,李超.一次大范圍暴雨過程的診斷分析.氣象科學(xué),2015,35(3):362-369 CHEN Tie, LUO Aiwen, XU Weigen, ZHANG Shumin, LI Chao. Diagnostic analysis on a wide range rainstorm process. Journal of the Meteorological Sciences,2015,35(3):362-369

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收稿日期:2013-08-20
最后修改日期:2013-11-13
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在線發(fā)布日期: 2015-07-03
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