一次廣州大暴雨的環(huán)境條件及中小尺度特征分析

doi:10.3969/2012jms.0011

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一次廣州大暴雨的環(huán)境條件及中小尺度特征分析
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                        10.3969/2012jms.0011
                    
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基金項(xiàng)目:廣東省科技廳社會(huì)發(fā)展氣象領(lǐng)域科技計(jì)劃項(xiàng)目(200907)

Analysis on environmental conditions and meso-microscale characteristics of a rainstorm in Guangzhou

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摘要:

基于常規(guī)觀測(cè)資料、NCEP1°×1°再分析資料和廣州多普勒天氣雷達(dá)資料,對(duì)2010年 5月14—15日廣州大暴雨的環(huán)境條件、散度渦度場(chǎng)和中小尺度特征等進(jìn)行了分析。結(jié)果表明:大暴雨過(guò)程中低層輻合高層輻散,促進(jìn)氣旋式渦度增加,上升運(yùn)動(dòng)增強(qiáng),反之亦然;中層波動(dòng)使得中低層輻合和中高層輻散更加深厚,進(jìn)一步增強(qiáng)上升運(yùn)動(dòng)?；浳髂吓瘽駳饬鞅鄙鲜苋趵淇諝庾钃踉趶V東省中北部地區(qū)堆積,為大暴雨提供水汽和能量。南下的弱冷空氣和日變化共同形成地面強(qiáng)能量鋒,與輻合線和低層切變線組成強(qiáng)有力的觸發(fā)抬升機(jī)制。大暴雨期間多普勒天氣雷達(dá)及時(shí)捕捉到逆風(fēng)區(qū)、弱中氣旋、中尺度輻合帶和中層兩次波動(dòng)影響,分別對(duì)應(yīng)兩個(gè)強(qiáng)降水時(shí)段。

Abstract:

Based on the conventional observational data,NCEP 1°×1°reanalyzed data and Doppler weather radar data, the environmental conditions and meso-microscale characteristics of the torrential rainfall in Guangzhou during May 14-15 were analyzed.The results showed that strong convergences at lower levels and strong divergence at upper levels contributed to enhance of cyclonic vorticities and ascending motions,or vice versa. Middle level fluctuations also helped strengthen convergence at low-middle levels,divergence at high-middle levels and then the ascending motion. High energy airs from southwest of Guangdong were hindered by cold airs and blocked in the middle and northern parts of Guangdong to provide water vapor and energies for rainstorms. The strong surface energy front formed by weak cold air advancing south and its daily variation, combined together with surface convergence line and wind shear line at low levels provided strong trigger mechanisms jointly. Doppler weather radar could detect the adverse wind regions,weak meso-cyclone, meso-scale convergence line and twice middle-level fluctuations, which are easier to reveal two precipitation stages.

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葉愛(ài)芬,伍志方,李懷宇.一次廣州大暴雨的環(huán)境條件及中小尺度特征分析.氣象科學(xué),2012,32(2):202-209 YE Aifen, WU Zhifang, LI Huaiyu. Analysis on environmental conditions and meso-microscale characteristics of a rainstorm in Guangzhou. Journal of the Meteorological Sciences,2012,32(2):202-209

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收稿日期:2010-10-19
最后修改日期:2010-12-17
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在線發(fā)布日期: 2012-05-03
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