西北地區(qū)東部一次持續(xù)性暴雨的成因分析

doi:10.3969/2012jms.00**

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西北地區(qū)東部一次持續(xù)性暴雨的成因分析
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                        10.3969/2012jms.00**
                    
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中圖分類號:P426.62
基金項目:國家科技攻關(guān)計劃，甘肅省氣象局資助項目?

The contributing factor analysis of a continued heavy rain case in eastern part of northwest China

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摘要:

分析了西北地區(qū)東部一次副高西北側(cè)西南氣流型的暴雨過程.結(jié)果表明,這次暴雨是中α和中β尺度對流云團引發(fā)的強對流性降水.青藏高原云團移到川西北后出現(xiàn)更新,老云團消亡時在其前方有新云團生成.冷鋒云帶到達甘肅河?xùn)|地區(qū)后,其前緣也觸發(fā)對流云團,受四川盆地強水汽輸送帶影響,新云團一般生成在水汽輸送帶左側(cè).強雨區(qū)產(chǎn)生在冷鋒云帶與對流云團結(jié)合時,對流云團的發(fā)展是水汽輸送及天氣系統(tǒng)輻合和有利的局地環(huán)境條件如雙層對流不穩(wěn)定加地形等多因子綜合作用的結(jié)果.區(qū)域性暴雨出現(xiàn)在冷鋒云帶與對流云團疊加區(qū),這里降水效率高.強雨區(qū)大多位于對流云團的西北或東北部與冷鋒云帶結(jié)合處.

Abstract:

In this paper a case heavy rain of southwest air stream type over northwest edge of subtropical high has been analyzed. The results show that this heavy rain is caused by strong convective precipitation generated in meso-α and meso-β convective cloud cluster. When the cloud cluster over Qinghai-Xizang plateau moves onto northwest Sichuan, the replacement occurs that the new cloud cluster supersedes in front of the old. Convective cloud cluster have been triggered from front edge of cold-front cloud zone when the latter moves onto eastern part of Gansu . In general, the new cloud clusters occur to the left of strong vapor transfer belt over Sichuan basin. The heavy rain area is generated when cold-front cloud zone combines with convective cloud cluster. As a result of many factors such as vapor transfer, synoptic system convergence , favorable local environmental and orographic conditions and so on the convective cloud cluster is developed. The regional heavy rain occurs inlaid with cold-front cloud zone and convective cloud cluster area where the precipitation efficiency is high . The heavy rain area is located in northwest or northeast part of convective cloud cluster where it associated with cold-front cloud zone.

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陳添宇,陳乾,付雙喜,毛玉琴.西北地區(qū)東部一次持續(xù)性暴雨的成因分析.氣象科學(xué),2009,(1):115-120 Chen Tianyu, Chen Qian, Fu Shuangxi, Mao Yuqin. The contributing factor analysis of a continued heavy rain case in eastern part of northwest China. Journal of the Meteorological Sciences,2009,(1):115-120

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