一次江淮地區(qū)MCV過程的數(shù)值模擬分析

doi:10.3969/2017jms.0033

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一次江淮地區(qū)MCV過程的數(shù)值模擬分析
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                        10.3969/2017jms.0033
                    
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基金項目:江蘇省氣象局預(yù)報員專項項目（JSYBY201612；JSYBY201810）；連云港市科技局項目（SH1422）；連云港市氣象局科技計劃項目（LG201604）；連云港市氣象局海洋預(yù)報科技創(chuàng)新團隊基金

Numerical simulation on a MCV case in Yangtze-Huaihe Basin

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本文在前期統(tǒng)計工作的基礎(chǔ)上，選取了一次典型的中尺度對流渦旋（MCV）個例，利用NCEP/NCAR再分析資料分析其背景場特征，并利用WRF數(shù)值模擬結(jié)果分析其成因及其觸發(fā)"二次對流"的可能機制。結(jié)果表明：MCV發(fā)生前，江淮地區(qū)處于200 hPa強輻散場中，高層抽吸作用明顯，500 hPa江淮西北部短波槽槽后不斷有冷空氣南下，加強該地區(qū)大氣層結(jié)不穩(wěn)定，850 hPa湖北至安徽中部有切變線活動，這種高低層配置十分有利于MCV生成及對流發(fā)生；MCV生命史各階段垂直輸送項和渦管傾斜項呈反位相分布，而水平平流項和輻合輻散項的作用基本是相互抵消的，垂直輸送項和輻合輻散項是MCV生成階段中低層渦度的主要來源；MCV引發(fā)的"二次對流"出現(xiàn)在其生成階段，且位于其南側(cè)，MCV發(fā)展成熟后，對流迅速減弱；MCV的生成使南側(cè)西南低空急流加強，伴隨水平渦度的變化，"二次對流"的發(fā)生發(fā)展與水平渦度對應(yīng)的垂直環(huán)流上升支有直接聯(lián)系。

Abstract:

Based on the previous statistical analysis, a typical Mesoscale Convective Vortex (MCV) case was selected to investigate its background situation, possible causes and vertical structures by using NCEP/NCAR global objective analysis and WRF simulation data. Results indicate that before MCV forms, Yangtze-Huaihe Basin is in the position with strong divergence at 200 hPa, and dry cold air invasion increases potential instability of atmosphere structure. The shear line is active from Hubei to the center of Anhui Province, which is of great importance to the generation of MCV and new convection. The contributions from vertical advection and tilting counteract at different levels during each stage of MCV lifetime while that from horizontal advection and convergence is opposite. The major vorticity in low layer during the development stage of MCV comes from vertical advection and convergence as a whole. The secondary convection is located on the southern part of MCV center and mainly occurs during the development stage of MCV. After the formation of MCV, the southwesterly airstream in its southern part enhances the jet in the lower level, which may contribute to the change of horizontal vorticity result from vertical wind shear and then lead to updrafts. The two updrafts caused by different low level jets together provide dynamic conditions for the secondary convection.

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劉瑞翔,丁治英,張銀意,馬晨晨.一次江淮地區(qū)MCV過程的數(shù)值模擬分析.氣象科學(xué),2018,38(1):46-56 LIU Ruixiang, DING Zhiying, ZHANG Yinyi, MA Chenchen. Numerical simulation on a MCV case in Yangtze-Huaihe Basin. Journal of the Meteorological Sciences,2018,38(1):46-56

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收稿日期:2016-09-25
最后修改日期:2017-03-20
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在線發(fā)布日期: 2018-03-13
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