大別山地形對(duì)江淮颮線發(fā)展變化及組織結(jié)構(gòu)的影響研究

doi:10.3969/2017jms.0006

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大別山地形對(duì)江淮颮線發(fā)展變化及組織結(jié)構(gòu)的影響研究
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                        10.3969/2017jms.0006
                    
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基金項(xiàng)目:國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展項(xiàng)目計(jì)劃（973計(jì)劃）項(xiàng)目（2013CB430103）；國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目資助項(xiàng)目（41530427）；國(guó)家自然科學(xué)基金資助項(xiàng)目（41375058）；中國(guó)氣象科學(xué)研究院災(zāi)害天氣國(guó)家重點(diǎn)實(shí)驗(yàn)室開(kāi)放課題（2015LASW-A07）

Study of the orographic effects of the Dabie mountain on the development and structure of squall line

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利用中尺度WRF模式，NCEP/NCAR再分析資料以及常規(guī)氣象觀測(cè)資料，對(duì)2014年7月11—12日發(fā)生在江淮地區(qū)的一次颮線過(guò)程進(jìn)行數(shù)值模擬、地形敏感性試驗(yàn)和對(duì)比分析，研究了在經(jīng)過(guò)大別山地形時(shí)颮線內(nèi)部組織結(jié)構(gòu)的變化特征以及地形對(duì)其發(fā)展的影響。結(jié)果表明：（1）颮線經(jīng)過(guò)大別山主體時(shí)在山前加強(qiáng)以及過(guò)山后迅速減弱的主要原因與山前對(duì)流不穩(wěn)定、上升運(yùn)動(dòng)大于山后有關(guān)；（2）大別山東部邊緣對(duì)颮線的加強(qiáng)有增幅作用：當(dāng)午后颮線移至大別山東部邊緣時(shí)，東部邊緣的谷風(fēng)加強(qiáng)并強(qiáng)迫對(duì)流單體在颮線的前部新生，試驗(yàn)得出谷風(fēng)可使低層風(fēng)速最大增強(qiáng)6 m·s^-1左右，若無(wú)山谷存在時(shí)前向新生單體不再出現(xiàn)；（3）經(jīng)地形敏感性試驗(yàn)得出：地形引發(fā)的大別山東部背風(fēng)一側(cè)的背風(fēng)波擾動(dòng)，有利于颮線內(nèi)部對(duì)流單體的發(fā)展與加強(qiáng)，同時(shí)充沛的水汽補(bǔ)充，也是下山后颮線加強(qiáng)的因子之一。

Abstract:

By using the WRF model, NCEP/NCAR reanalysis data and conventional meteorological observation data, a squall line process occurred in Jianghuai region during 11-12 July, 2014 was conducted numerical simulation, topographical sensitivity experiments and comparison analysis. Moreover, the variation characteristics of inner organizational structure of the squall line and the orographic effect on the squall line when went through the Dabie Mountain were also studied. Results show that:(1) the reasons why the squall line strengthened in front of the mountain and while weakened rapidly at the leeward side are the instable windward convection and the much stronger upward movement. (2)The eastern edge of Dabie Mountain had a greater contribution to the strengthening of the squall line. When the squall line moved to the Dabie Mountain in the afternoon, the valley wind circulation strengthened at the eastern edge and it forced the convective cell generate in the front of the squall line. The experiment shows that the valley wind can enhance the low-level wind velocity up to 6 m·s^-1. There existed no new cell without the valley wind. (3)Sensitivity experiments implied that the lee wave turbulence at the east side of Dabie Mountain caused by the terrain is conducive to convective development and the strengthening of squall line. Furthermore, the supplement of abundant moisture is one of the factors to the strengthening of the squall line when it went down the mountain.

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王瑾婷,丁治英,趙向軍,劉瑾.大別山地形對(duì)江淮颮線發(fā)展變化及組織結(jié)構(gòu)的影響研究.氣象科學(xué),2017,37(5):639-651 WANG Jinting, DING Zhiying, ZHAO Xiangjun, LIU Jin. Study of the orographic effects of the Dabie mountain on the development and structure of squall line. Journal of the Meteorological Sciences,2017,37(5):639-651

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收稿日期:2016-09-09
最后修改日期:2017-01-09
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在線發(fā)布日期: 2018-01-15
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