高原東側(cè)突發(fā)性大暴雨過(guò)程中螺旋度的診斷分析

doi:10.3969/2012jms.00**

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高原東側(cè)突發(fā)性大暴雨過(guò)程中螺旋度的診斷分析
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                        10.3969/2012jms.00**
                    
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中圖分類號(hào):P458.121.1
基金項(xiàng)目:國(guó)家自然科學(xué)基金?

Diagnostic analysis of the helicity for a heavy rainfall in the east of Plateau

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利用MM5模式模擬輸出結(jié)果,對(duì)2002年6月8-9日發(fā)生在陜西省和四川北部的一次突發(fā)性大暴雨過(guò)程進(jìn)行了螺旋度診斷分析.結(jié)果表明:暴雨區(qū)附近總存在一對(duì)緊鄰的大小(低層)或正負(fù)(中層)螺旋度中心,低層螺旋度正值區(qū)強(qiáng)度遠(yuǎn)大于中高層螺旋度正負(fù)值區(qū),對(duì)流層中層正負(fù)中心的軸線隨高度呈逆時(shí)針旋轉(zhuǎn),相應(yīng)的垂直結(jié)構(gòu)是一對(duì)正負(fù)相伴的螺旋度柱.當(dāng)暴雨區(qū)東側(cè)正螺旋度突然向高層伸展,西側(cè)伴有負(fù)螺旋度發(fā)展,且兩中心間等值線變密集時(shí),暴雨開(kāi)始,大小(正負(fù))螺旋度最強(qiáng)及其間等值線最緊密時(shí),暴雨達(dá)到最強(qiáng)盛時(shí)期,而且暴雨就發(fā)生在兩螺旋度之間偏大值中心的等值線密集區(qū).進(jìn)一步分析表明:螺旋度發(fā)生發(fā)展的主要貢獻(xiàn)者是水平速度和水平速度的垂直切變.

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Using the results of MM5 mesoscale non-hydrostatic model，the helicity of a heavy rainfall occurring in the east of plateau from June 8 to June 9，2002 was diagnosed and analysed.The results showed that there was a pair of centers of positive and negative helicity in the neighbouhood of torrential rain areas. The intensity of positive helicity at the lower level of troposphere was more higher than the positive or negative helicity at the middle and high level of troposphere.The axes of positive and negative helicity circumrotated counterclockwise with elevation and the vertical structure was a pair of columns of intercomparing helicity with opposite signs at the middle-level of troposphere.The evolution and areas of heavy rainfall had a closed relation with the development of helicity at the middle and lower level of troposphere.The torrential rain occurrs when the positive helicity in the eastern part of the heavy rainfall extends suddenly to upper level，having the negative helicity in the western part of the torrentail rain and close isolines in the two centers of helicity.The heavy rainfall happened in the dense area of the isolines.Furthermore，horizontal velocity and its vertical shear were main contribution to the evolution of helicity，which mean the development of lower-level jet and vertical vorticity. Namely the increase of helicity led to the development of unstable energy and vertical velocity，promoting the evolution of convectional system，which indicated that the development of helicity was one of the rainstorm-forming mechanisms.

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慕建利,李澤椿,壽紹文,杜繼穩(wěn).高原東側(cè)突發(fā)性大暴雨過(guò)程中螺旋度的診斷分析.氣象科學(xué),2009,(2):181-186 Mu Jianli, Li Zechun, Shou Shaowen, Du Jiwen. Diagnostic analysis of the helicity for a heavy rainfall in the east of Plateau. Journal of the Meteorological Sciences,2009,(2):181-186

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