一次華北冷渦動力熱力結構及發(fā)展機制分析

doi:10.3969/2012jms.00**

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一次華北冷渦動力熱力結構及發(fā)展機制分析
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                        10.3969/2012jms.00**
                    
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中圖分類號:P458.121.2
基金項目:科技部公益性行業(yè)（氣象）科研專項（GYHY200706042）;浙江省氣象局重點科技專項(2008ZD14)

Analysis on dynamic and thermal structure and development mechanism in a cold vortex over North China

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通過對2008年6月22—30日產(chǎn)生強對流天氣過程中的華北冷渦動力、熱力結構和演變特征的分析，發(fā)現(xiàn)：此次冷渦發(fā)展深厚，300 hPa冷渦中心明顯，冷渦還在地面誘發(fā)了鋒面氣旋。在冷渦發(fā)展直至初步減弱階段對流層整層都為正渦度區(qū)，中高層正渦度逐漸向低層傳播。冷渦發(fā)展加強階段，冷渦南側高空西風急流發(fā)展加強，東西兩側的經(jīng)向風分布趨于對稱，東部和南部伴隨較強的垂直上升運動。華北冷渦中心干冷，對流層中層西北干冷空氣的侵入，對冷渦的發(fā)展加強起著重要作用。此次過程中，持續(xù)的東南氣流將渤海的水汽向華北地區(qū)輸送，水汽以東西向輻合為主。冷渦后部冷空氣南下的日變化活動規(guī)律明顯，10—13時侵入至京津冀地區(qū)，維持時間為15～20 h。冷渦后部干冷空氣的向南侵入易造成強對流天氣發(fā)生。

Abstract:

Through analyses on the structure and evolution characteristics of cold vortex from June 22 to 30, 2008,it was found that this cold vortex developed strongly, its center at 300 hPa was evident, it also had induced frontal cyclone on the ground. In the process from the development phase to the initial weakening stage, the entire troposphere consisted of positive vorticity, which spread from middle and high level to low level gradually. In the development stage, highaltitude westerly jet strengthened in the south of the cold vortex, the longitude direction wind distribution tended to become symmetry on the east and west sides, in the east and south a strong vertical ascending motion appeared. The center of the cold vortex was dry and cold, the intrusion of dry and cold northwest air in middle troposphere played an important role in further development of the cold vortex In this process, continuous southeast water vapor stream was transported from the Bohai Sea to north China, the convergence of water vapor was limited on the east and west sides mainly. The daily change's activities of the cold air going to the south at the rear of the cold vortex were obvious. The cold air penetrated to Beijing, Tianjin and Hebei areas from ten to thirteen o'clock, maintained for 15-20 h. The dry and cold air at the rear of the cold vortex intruded southward and led to the severe convection.

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郁珍艷,何立富,李澤椿.一次華北冷渦動力熱力結構及發(fā)展機制分析.氣象科學,2011,(6):667-676 YU Zhenyan, HE Lifu, LI Zechun. Analysis on dynamic and thermal structure and development mechanism in a cold vortex over North China. Journal of the Meteorological Sciences,2011,(6):667-676

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收稿日期:2010-08-29
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在線發(fā)布日期: 2012-05-17
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