西風(fēng)槽與強(qiáng)熱帶風(fēng)暴配置下動(dòng)力正、斜壓性對(duì)暴雨影響研究

doi:10.3969/2013jms.0024

首頁(yè) > 過(guò)刊瀏覽>2013年第33卷第3期 >347-354. DOI:10.3969/2013jms.0024

西風(fēng)槽與強(qiáng)熱帶風(fēng)暴配置下動(dòng)力正、斜壓性對(duì)暴雨影響研究
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                        10.3969/2013jms.0024
                    
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基金項(xiàng)目:國(guó)家自然科學(xué)基金面上項(xiàng)目(41276033);國(guó)家科技支撐計(jì)劃項(xiàng)目(2012BAH05B01);公益性行業(yè)(氣象)科研專項(xiàng)(201206068);南京氣象雷達(dá)開放實(shí)驗(yàn)室研究基金項(xiàng)目(BJG201105);江蘇省科技支撐計(jì)劃項(xiàng)目(BE2012774);江蘇高校優(yōu)勢(shì)學(xué)科建設(shè)工程資助項(xiàng)目(PAPD)

Impact of dynamic barotropics and baroclinics on rainstorm under combination of strong tropical storm and westerly trough

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摘要:

用加密氣象站降水資料、NCEP再分析資料以及WRF 模式的精細(xì)化模擬產(chǎn)品資料,對(duì)2011年6月24日20時(shí)-25日20時(shí),由強(qiáng)熱帶風(fēng)暴"米雷"與西風(fēng)槽結(jié)合造成的江淮區(qū)域暴雨過(guò)程進(jìn)行分析和診斷。結(jié)果表明:西風(fēng)槽溫壓場(chǎng)斜壓性顯著,強(qiáng)熱帶風(fēng)暴溫壓場(chǎng)正壓性顯著, 構(gòu)成了有利于中小尺度系統(tǒng)和暴雨發(fā)生發(fā)展的環(huán)流背景。由強(qiáng)熱帶風(fēng)暴攜帶而來(lái)的水汽,路程近、速度快,在暴雨區(qū)形成深厚的水汽層。暴雨區(qū)具有兩個(gè)上下疊置的垂直上升運(yùn)動(dòng)中心,保持對(duì)水汽的深厚強(qiáng)抬升,維持暴雨環(huán)流系統(tǒng)的強(qiáng)度。暴雨區(qū)環(huán)境大氣流場(chǎng)動(dòng)力正、斜壓分解顯示,此次暴雨過(guò)程大氣流場(chǎng)的斜壓成分占顯著的主導(dǎo)地位;暴雨開始階段, 正壓動(dòng)能向斜壓動(dòng)能的轉(zhuǎn)換迅速增強(qiáng), 各分項(xiàng)和總項(xiàng)都達(dá)到最大值;其后的暴雨階段, 轉(zhuǎn)換強(qiáng)度逐漸減弱, 暴雨結(jié)束時(shí)各項(xiàng)都接近0值,甚至出現(xiàn)弱的斜壓動(dòng)能向正壓動(dòng)能的轉(zhuǎn)換。

Abstract:

Based on precipitation data from weather stations,NCEP reanalysis data and refined simulated product data from WRF model, the rainstorm occurred in Changjiang-Huaihe area caused by the combination of strong tropical storm "Milai" and westerly trough from 20:00, June 24 to 20:00, June 25, 2011 is diagnosed and analysed. The results show that the strong tropical storm is mainly a barotropic system while the westerly trough is a baroclinic system, which constructs background bene ficial to easy development of rainstorm and meso-scale system. With a short path from the East Sea and a fast transportation speed, the moisture brought by strong tropical storm forms a thick moisture layer over the heavy rainfall area, where two centers of vertical velocity overlap vertically, maintain the strong moisture lifting upwards and support the rainstorm strengthen. The analysis on dynamic barotropic and baroclinic characteristics of rainstorm environment shows that the baroclinic component is dominant in this rainstorm event. At the beginning of the rainstorm event, the conversion from barotropic to baroclinic energy enhances rapidly and gets to the peak, but in the following rainstorm period, the conversion strength gradually reduces; at the end of rainstorm, the items of calculation approaches zero or even occur weak inverse conversion.

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郭文剛,王堅(jiān)紅,于華,苗春生,梅海霞.西風(fēng)槽與強(qiáng)熱帶風(fēng)暴配置下動(dòng)力正、斜壓性對(duì)暴雨影響研究.氣象科學(xué),2013,33(3):347-354 GUO Wengang, WANG Jianhong, YU Hua, MIAO Chunsheng, MEI Haixia. Impact of dynamic barotropics and baroclinics on rainstorm under combination of strong tropical storm and westerly trough. Journal of the Meteorological Sciences,2013,33(3):347-354

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收稿日期:2013-01-07
最后修改日期:2013-04-22
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在線發(fā)布日期: 2013-06-24
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