基于多源資料的一次弓狀強颮線成熟結(jié)構(gòu)研究

doi:10.12306/2021jms.0105

首頁 > 過刊瀏覽>2023年第43卷第5期 >632-642. DOI:10.12306/2021jms.0105

基于多源資料的一次弓狀強颮線成熟結(jié)構(gòu)研究
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                        10.12306/2021jms.0105
                    
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中圖分類號:P458
基金項目:湖北省氣象局科技發(fā)展基金（2020Z05；2023Y19；2021Y05）；國家自然科學(xué)基金資助項目（41705019）；政府間國際科技創(chuàng)新合作重點專項（2016YFE0109400）；氣象災(zāi)害教育部重點實驗室/氣象災(zāi)害預(yù)報預(yù)警與評估協(xié)同創(chuàng)新中心聯(lián)合開放課題（KLME202211）；中國氣象局創(chuàng)新發(fā)展專項（CXFZ2021Z081）

Analysis on the mature-stage structures of a arc-shaped strong squall line based on multi-source data

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利用局地分析和預(yù)報系統(tǒng)（Local Analysis and Prediction System，LAPS），結(jié)合多源資料，分析了2018年3月4日暖區(qū)強颮線成熟階段的熱動力結(jié)構(gòu)和大風形成機制。結(jié)果表明：暖區(qū)內(nèi)層結(jié)不穩(wěn)定范圍向東擴展和強的垂直風切變，驅(qū)動颮線組織化加強并向前移動和發(fā)展。成熟階段颮線熱動力結(jié)構(gòu)呈現(xiàn)出兩支強入流和冷池的典型特征，即前側(cè)入流在低層（0~3.0 km）輻合上升，部分氣流在高層翻轉(zhuǎn)流向系統(tǒng)前側(cè)，無后向流出；后側(cè)中層（4.0~5.5 km）入流進入云體后部，在水凝物強烈相變降溫作用下，密度增大轉(zhuǎn)而下沉；下沉氣流區(qū)降雨蒸發(fā)冷卻增強了雷暴冷池。相比于颮線南段單一的對流線，北段弓形特點突出，后側(cè)入流下降，加之存在尾隨層狀云，有更大的潛在冷卻作用，促進氣流加速下沉增強地面雷暴高壓，最終導(dǎo)致更強的極端大風。

Abstract:

Local Analysis and Prediction System (LAPS), combining multiple data sources, were used to investigate the severe surface wind formation mechanism and the mature-stage structures of a warm-sector severe squall line occurring on 4 March 2018. An organized squall line was formed and moved forward due to the strong vertical wind shear and instability stratification spreading eastward in the warm zone. At the squall-line mature stage, the thermal dynamic structure was characterized by two strong inflows and a cold pool. The front-to-rear inflow converged in the low layers and then rose, and part flowed forward aloft without obvious rearward storm outflow. The mid-tropospheric rear inflow at a height of 4.0-5.5 km intruded into the back edge of the storm, and then sunk due to strong sublimation cooling. Over this downdraft region, cold pools strengthened due to rain evaporative cooling. The north and south structures of the squall-line bow echo displayed only a convective line and convective line followed by a narrow stratiform precipitation region, respectively. In the northern section, the presence of a stratiform precipitation region can lead to a more significant cooling potential. That can cause the rear inflow to descend closer to the surface, resulting in a stronger thunderstorm high and potentially reinforcing severe surface winds.

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孫玉婷,李紅莉,汪小康,康兆萍,肖艷姣,林建.基于多源資料的一次弓狀強颮線成熟結(jié)構(gòu)研究.氣象科學(xué),2023,43(5):632-642 SUN Yuting, LI Hongli, WANG Xiaokang, KANG Zhaoping, XIAO Yanjiao, LIN Jian. Analysis on the mature-stage structures of a arc-shaped strong squall line based on multi-source data. Journal of the Meteorological Sciences,2023,43(5):632-642

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收稿日期:2021-08-05
最后修改日期:2021-12-03
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在線發(fā)布日期: 2024-01-23
出版日期: 2023-10-15

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