高原渦與西南渦相互作用引發(fā)MCC暴雨的形成機制分析

doi:10.12306/2020jms.0002

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高原渦與西南渦相互作用引發(fā)MCC暴雨的形成機制分析
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                        10.12306/2020jms.0002
                    
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中圖分類號:P434
基金項目:四川省氣象局高原與盆地暴雨旱澇災害四川省重點實驗室開放研究基金（KT2017001）；青海省科學技術廳應用基礎研究項目（2020-EZ-739）；瀘州市科技局院地校地科技合作研發(fā)項目（2019-YD-81）

Analysis of formation mechanism of MCC heavy rain caused by interaction between plateau vortex and southwest vortex

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使用常規(guī)觀測資料、ERA-Interim再分析資料和衛(wèi)星資料，以2014年7月8—10日西南渦和高原渦相互作用引發(fā)MCC產生大暴雨的天氣過程為例，分析了兩渦作用導致大暴雨的形成機制。結果表明：相互作用前期，兩渦渦心間距較遠，在500 hPa高度上兩者同處于青海南部的氣旋及其向南延伸的低槽前。約24 h后，高原渦東移與西南渦在不同高度上垂直疊加，耦合作用形成，導致四川盆地的大暴雨。利用衛(wèi)星云圖分析兩渦作用伴隨的MCC特征，發(fā)現(xiàn)強降水區(qū)與云團黑體亮溫的冷中心吻合。西南渦與高原渦相互作用時，對流層低層形成強烈的輻合，垂直上升運動加強，大氣流場呈強烈不穩(wěn)定性，與渦心附近形成的水汽輻合作用結合，促進MCC發(fā)展成熟，導致四川盆地大暴雨天氣形成。

Abstract:

Based on conventional observation data, ERA-Interim reanalysis data and satellite data, the two vortex effects by taking the weather process of the MCC from heavy rain caused by the interaction between the southwest vortex and the plateau vortex from July 8 to 10, 2014 were analyzed, as well as the mechanism led to the formation of heavy rains. Results show that in the early stage of interaction, the distance between the two vortex cores is far, and both of them at 500 hPa height are sited in front of the cyclone in the southern part of Qinghai and the low trough extending southward. After about 24 hours, in the eastward movement, the plateau vortex vertically overlap with the southwest vortex at different heights, and the coupling effect is formed, which leads to the formation of heavy rain in the Sichuan Basin. The satellite cloud image is used to analyze the MCC characteristics that the two vortices accompany. It is found that the strong precipitation area coincides with the cold center of the cloud black body. When the southwest vortex interacts with the plateau vortex, the lower troposphere forms a strong convergence, the vertical ascending motion is strengthened, and the airflow field is strongly unstable, which combine with the water vapor radiant formation formed near the vortex core, so as to promote the maturation of MCC and lead to the formation of heavy rainstorms in the Sichuan basin.

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蒲學敏,白愛娟.高原渦與西南渦相互作用引發(fā)MCC暴雨的形成機制分析.氣象科學,2021,41(1):27-38 PU Xuemin, BAI Aijuan. Analysis of formation mechanism of MCC heavy rain caused by interaction between plateau vortex and southwest vortex. Journal of the Meteorological Sciences,2021,41(1):27-38

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收稿日期:2019-06-19
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在線發(fā)布日期: 2021-03-20
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