一次高原低渦誘發(fā)西南低渦耦合加強(qiáng)的動(dòng)力診斷分析

doi:10.3969/2019jms.0012

首頁 > 過刊瀏覽>2020年第40卷第3期 >363-373. DOI:10.3969/2019jms.0012

一次高原低渦誘發(fā)西南低渦耦合加強(qiáng)的動(dòng)力診斷分析
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                        10.3969/2019jms.0012
                    
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中圖分類號(hào):P435
基金項(xiàng)目:國家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目（2018YFC1507200）；國家自然科學(xué)基金資助項(xiàng)目（41675057；41765003）；中國氣象局氣候變化專項(xiàng)（CCSF202020）；重慶市氣象局重點(diǎn)業(yè)務(wù)建設(shè)項(xiàng)目

Dynamic diagnosis of the strengthened Southwest Vortex coupling induced by the Plateau Vortex

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利用2013年6月29日—7月2日期間逐6 h的NCEP 0.5°×0.5°全球預(yù)報(bào)場(chǎng)再分析GFS （Global Forecast System）資料，對(duì)一次引發(fā)特大暴雨的西南低渦和高原低渦耦合貫通加強(qiáng)過程進(jìn)行動(dòng)力診斷分析，結(jié)果表明：西南低渦和高原低渦耦合區(qū)上方在不同階段均維持正渦度柱，呈現(xiàn)低空輻合和高空輻散的特征，并伴有強(qiáng)烈上升運(yùn)動(dòng)。垂直運(yùn)動(dòng)在耦合開始階段最強(qiáng)，正渦度柱在耦合強(qiáng)盛階段顯著增強(qiáng)，高原低渦和西南低渦耦合貫通后，改變了渦度的垂直特征。西南低渦發(fā)展維持的渦動(dòng)動(dòng)能主要源于水平通量散度項(xiàng)和渦動(dòng)動(dòng)能制造項(xiàng)，摩擦耗散項(xiàng)和垂直通量散度項(xiàng)是其主要消耗項(xiàng)。高原低渦發(fā)展維持的渦動(dòng)動(dòng)能主要源于垂直通量散度項(xiàng)和區(qū)域平均動(dòng)能與渦動(dòng)動(dòng)能之間的轉(zhuǎn)換項(xiàng)，渦動(dòng)動(dòng)能制造項(xiàng)出現(xiàn)負(fù)值是其渦動(dòng)動(dòng)能減弱的主要原因。耦合期間強(qiáng)烈垂直運(yùn)動(dòng)將西南低渦的渦動(dòng)動(dòng)能向高原低渦輸送，西南低渦對(duì)高原低渦發(fā)展維持有重要?jiǎng)恿ψ饔谩?/p>

Abstract:

By using the NCEP 0.5°×0.5° GFS (Global Forecast System) data from June 29 to July 2 in 2013, the dynamic diagnostic process coupled with a Southwest Vortex and a Plateau Vortex was analyzed. The main results show that: The coupling region of the Southwest Vortex and the Plateau Vortex remains the positive vorticity column, low level convergence and high level divergence characteristics, and a strong upward motion at various stages. The vertical movement is strongest at the beginning state of the coupling process. The positive vorticity column significantly enhance at the powerful stage of the coupling process. The vertical characteristics of vorticity are changed after the coupling of the Southwest Vortex and the Plateau Vortex. The eddy kinetic energy of the development and maintenance of Southwest Vortex mainly due to the horizontal flux divergence term and the generation term of kinetic energy. The dissipation term and vertical flux divergence term are the main consumption items of the Southwest Vortex. The eddy kinetic energy of the development and maintenance of the Plateau Vortex mainly due to vertical flux divergence term and the conversion term. The negative generation term is the main weakness reason of the Plateau Vortex eddy kinetic energy. During the coupling period, strong vertical motion transports the eddy kinetic energy of the Southwest Vortex to the Plateau Vortex, which plays an important dynamic role in maintaining the development of the Plateau Vortex.

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劉曉冉,李國平,胡祖恒,李永華.一次高原低渦誘發(fā)西南低渦耦合加強(qiáng)的動(dòng)力診斷分析.氣象科學(xué),2020,40(3):363-373 LIU Xiaoran, LI Guoping, HU Zuheng, LI Yonghua. Dynamic diagnosis of the strengthened Southwest Vortex coupling induced by the Plateau Vortex. Journal of the Meteorological Sciences,2020,40(3):363-373

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收稿日期:2018-08-23
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