滇東北一次颮線過程的中尺度結構特征

doi:10.3969/2012jms.00**

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滇東北一次颮線過程的中尺度結構特征
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                        10.3969/2012jms.00**
                    
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中圖分類號:P458.2
基金項目:昭通市氣象局課題“昭通冰雹天氣預警和人工影響天氣作業(yè)研究”

The mesoscale configuration characteristics of a squall line happened in the northeast of Yunnan province

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利用常規(guī)觀測資料、衛(wèi)星云圖和多普勒天氣雷達資料，綜合分析了2007年6月14日發(fā)生在滇東北的一次颮線過程。結果表明：颮線發(fā)生在700 hPa切變線前和冷鋒前暖區(qū)中，位于高層冷舌和低層暖舌相疊置的地區(qū)，高層冷空氣侵入和地面中尺度切變線的觸發(fā)作用是颮線形成和發(fā)展的主要動力過程。颮線前沿形成含有5個強單體的帶狀強回波，成熟階段的強單體出現(xiàn)了弓形回波特征。颮線前沿出現(xiàn)低層輻合、中層徑向輻合和高層輻散的特征，低層β中尺度輻合線隨高度增加向颮線后部傾斜。颮線前沿存在前側低層入流、中高層出流急流以及后側低層入流急流。颮線上存在深厚的上升氣流，兩側為下沉氣流,且前方的下沉氣流比后方強。低層強垂直風切變有利于颮線的產(chǎn)生和發(fā)展。

Abstract:

Based on conventional data， satellite cloud imagery and Doppler radar data, a squall line happened in the northeast of Yunnan Province on 14 June 2007 was analyzed. The result showed that Zhaotong was located in the superimposed region of cold tongue at the upper level and warm tongue at the lower level. The squall line was located in front of shear line at 700 hPa and in the warm region in front of cold front. The front of squall line included five strong cells bowlike echo in mature stage. A mesoscale convergence appeared in front of the squall line, the convergence line was sloped to the rear of the squall line as the height raises. The front of the squall line had convergence at the low level,Mid-Altitude Radial Convergence (MARC) and divergence on the top of the storm. There were inflow at the low level and strong outflow at the middle level before the squall line,and strong inflow at the low level behind it. The squall line had strong updraft in it and downdraft beside it. The downdraft before the squall line was stronger than the downdraft behind it. The strong warm advection and strong vertical wind shear at the low level accelerated the organization and development of the squall line.

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馬紅,胡勇,鄭翔飚,韓勇怡.滇東北一次颮線過程的中尺度結構特征.氣象科學,2010,(6):874-880 Ma Hong, Hu Yong, Zheng Xiangbiao, Han Yongyi. The mesoscale configuration characteristics of a squall line happened in the northeast of Yunnan province. Journal of the Meteorological Sciences,2010,(6):874-880

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收稿日期:2009-07-01
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