安徽一次大范圍暴雨和大風(fēng)過程的成因分析

doi:10.3939/2012jms.0054

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安徽一次大范圍暴雨和大風(fēng)過程的成因分析
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                        10.3939/2012jms.0054
                    
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基金項目:公益性行業(yè)(氣象)科研專項(GYHY201006001);安徽省氣象科研面上項目(KM201102Z)

Analysis on a case of wide-range rainstorm and gale process in Anhui province

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對2010年6月8日08時—9日08時發(fā)生在安徽麥?zhǔn)諈^(qū)的一次大范圍暴雨和大風(fēng)過程進(jìn)行天氣學(xué)分析,分析結(jié)果表明:在低層輻合、高層輻散的有利環(huán)流配置條件下,高壓的阻擋、低空西南急流和低空東風(fēng)急流是形成這次暴雨的最主要原因。高壓阻擋使降雨維持的時間較長,兩支低空急流不僅為暴雨區(qū)提供了充沛的水汽,而且兩者之間的相互作用使得降雨進(jìn)一步增強(qiáng)。通過對低空東風(fēng)急流的作用做深入分析發(fā)現(xiàn):低空東風(fēng)急流的存在不僅使低空西南急流輸送的水汽在其左側(cè)累積,而且低空東風(fēng)急流上的正渦度平流也迫使江淮氣旋向麥?zhǔn)諈^(qū)方向緩慢移動,并使其不斷發(fā)展,進(jìn)一步加大了江淮氣旋移動前方的氣壓梯度,使風(fēng)力加大,東風(fēng)急流進(jìn)一步加強(qiáng),形成正反饋機(jī)制。另外東風(fēng)急流的動量下傳又使得地面出現(xiàn)偏東大風(fēng)。

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A wide range rainstorm and gale case occurred in wheat harvest areas of Anhui province on June 8 and 9, 2010 was analyzed in this paper. The results indicated that under the favorable conditions of circulation configuration between low-level convergence and upper-level divergence, the high-pressure blocking, southwest and easterly low-level jet were the main reasons for this rainstorm. The rain lasted for a long time due to the high-pressure blocking, and abundant water vapour was provided by the two low-level jets for the rainstorm, it was their interaction that further enhanced the precipitation. According to the comprehensive analysis, the existence of easterly low-level jet led to the water vapor transportation by southwest jet and the accumulation on its left side, and the positive vorticity advection on the easterly low level jet made the Jianghuai cyclone developing through the slow-moving process towards the wheat area, which further increased the pressure gradient in front of the Jianghuai cyclone, and the geostrophic wind increased while the easterly low-level jet was further strengthened, therefore the positive feedback mechanism was set up. Furthermore, the downward momentum transfer of easterly low-level jet caused the easterly ground gale.

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余金龍,姚葉青,邱學(xué)興.安徽一次大范圍暴雨和大風(fēng)過程的成因分析.氣象科學(xué),2012,32(3):288-292 YU Jinlong, YAO Yeqing, QIU Xuexing. Analysis on a case of wide-range rainstorm and gale process in Anhui province. Journal of the Meteorological Sciences,2012,32(3):288-292

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收稿日期:2011-05-23
最后修改日期:2011-09-24
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在線發(fā)布日期: 2012-06-15
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