雙TC和梅雨鋒共同作用下的一次暴雨過(guò)程分析

doi:10.3969/2014jms.0006

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雙TC和梅雨鋒共同作用下的一次暴雨過(guò)程分析
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                        10.3969/2014jms.0006
                    
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基金項(xiàng)目:舟山海上交通高影響天氣預(yù)報(bào)服務(wù)技術(shù)研究（2013C13044）

Analysis on a rainstorm caused by double tropical cyclones and Meiyu front

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通過(guò)NCEP再分析資料計(jì)算各種物理量和應(yīng)用衛(wèi)星云圖、雷達(dá)資料，并用WRF中尺模式做數(shù)值模擬，從動(dòng)力過(guò)程、水汽輸送過(guò)程、中小尺度系統(tǒng)等3個(gè)方面對(duì)TC和梅雨鋒共同作用在浙北產(chǎn)生的一次暴雨過(guò)程進(jìn)行分析。結(jié)論如下：（1）動(dòng)力過(guò)程特點(diǎn)：300 hPa急流出口區(qū)輻散，中層3支氣流匯合形成變形場(chǎng)鋒生，產(chǎn)生強(qiáng)烈上升運(yùn)動(dòng)。低層TC外圍的東南氣流輸入暖平流和濕位渦，使海上臺(tái)風(fēng)倒槽向北傳播發(fā)展，最終形成氣旋。TC高層流出氣流對(duì)梅雨鋒南側(cè)垂直環(huán)流的維持有利；（2）水汽主要由兩個(gè)TC外圍的環(huán)流輸送；（3）衛(wèi)星云圖和雷達(dá)回波顯示有不同的降水云團(tuán)合并且有加強(qiáng)的過(guò)程。用WRF中尺模式做數(shù)值模擬顯示：700 hPa中小尺度的切變線或輻合區(qū)與強(qiáng)降水回波相對(duì)應(yīng)。過(guò)程主要特點(diǎn)是中低層兩個(gè)TC外圍的氣流與西風(fēng)帶氣流在華東地區(qū)匯合，形成變形場(chǎng)鋒生，產(chǎn)生強(qiáng)烈的輻合上升。在不同的氣流匯合后產(chǎn)生了強(qiáng)急流輸送水汽，加強(qiáng)垂直環(huán)流和中小尺度的輻合，是強(qiáng)降水產(chǎn)生的主要原因。西南季風(fēng)經(jīng)過(guò)臺(tái)風(fēng)繞流后在合適的環(huán)境場(chǎng)下仍有可能到達(dá)華東地區(qū)，這時(shí)往往與中緯度西風(fēng)帶匯合，在這種情況下會(huì)加強(qiáng)梅雨降水。

Abstract:

A torrential rain caused by double tropical cyclones and Meiyu front in northern Zhejiang was analyzed through calculating the synoptic situation and physical quantity by NCEP reanalysis data. Based on satellite imagery and radar data, numerical simulation by WRF was conducted to analyze the dynamic process,water vapor transmission,mesoscale and small-scale systems of the rainstorm. The results show:(1) Characteristics of the dynamic process:the frontogenesis deformation caused by divergence of 300 hPa jet stream in exit area and convergence of three airflows in middle layer could produce an strong upward movement. Southeast airflow in the periphery of the lower TC "Guchol" provided warm advection and moist potential vorticity,making the typhoon inverted trough on the sea spread northward and form cyclone eventually. Outflow from the upper TC "Guchol" was good at preserving vertical circulation in the south side of Meiyu front. (2) Water vapor was mainly delivered by two circulations in the periphery of tropical cyclones. (3)Satellite imagerys and radar echo data showed a merging and strengthening process of different precipitation clouds. Numerical simulation by WRF shows that mesoscale shear line or convergence zone at 700 hPa is corresponding with heavy precipitation echo. The main feature of the process is the meeting of peripheral airflow of TCs with westerly airflow, which not only caused deformation frontogenesis, strong convergence and upward movement, but transported water vapor by strong jet and enhanced the vertical circulation and mesoscale convergence.Southwest monsoon still might arrive at Jianghuai region after flowing around the typhoon in good condions, which would strengthen the Meiyu precipitation when it is confluent with the mid-latitude westerlies.

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陳淑琴,陳梅汀,龔,錢(qián)滿億,周昊.雙TC和梅雨鋒共同作用下的一次暴雨過(guò)程分析.氣象科學(xué),2014,34(3):335-342 CHEN Shuqin, CHEN Meiting, GONG Yan, QIAN Manyi, ZHOU Hao. Analysis on a rainstorm caused by double tropical cyclones and Meiyu front. Journal of the Meteorological Sciences,2014,34(3):335-342

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收稿日期:2013-08-05
最后修改日期:2013-12-17
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在線發(fā)布日期: 2014-07-11
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