一次大范圍海效應(yīng)暴雪的雷達(dá)反演風(fēng)場(chǎng)分析

doi:10.3969/2014jms.0074

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一次大范圍海效應(yīng)暴雪的雷達(dá)反演風(fēng)場(chǎng)分析
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                        10.3969/2014jms.0074
                    
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基金項(xiàng)目:國家自然科學(xué)基金資助項(xiàng)目(41175044)

Analysis on radar wind field retrieval of a snowstorm derived from ocean-effect

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摘要:

用EVAP(Extended Velocity Azimuth Processing)方法對(duì)2010年12月30日發(fā)生在山東半島的一次海效應(yīng)暴雪過程進(jìn)行風(fēng)場(chǎng)反演,以了解暴雪過程中雷達(dá)回波和低層風(fēng)場(chǎng)的特征。得出以下結(jié)論:(1)煙臺(tái)和威海暴雪發(fā)生時(shí)間不同步,降雪帶有明顯東移的過程,對(duì)應(yīng)煙臺(tái)強(qiáng)回波帶逐漸向東移動(dòng),而威海回波位置少動(dòng)。(2)雷達(dá)回波開始產(chǎn)生于渤海,減弱也始于渤海;強(qiáng)回波帶的位置與風(fēng)場(chǎng)的輻合區(qū)有很好的對(duì)應(yīng)關(guān)系。(3)反演風(fēng)場(chǎng)水平切變線的移動(dòng),會(huì)引起強(qiáng)回波帶的波動(dòng);煙臺(tái)北部切變線相對(duì)穩(wěn)定,南部切變線西移,致使強(qiáng)回波帶沿順時(shí)針方向旋轉(zhuǎn);威海南部切變線位置相對(duì)穩(wěn)定,北部切變線西移,引起強(qiáng)回波帶沿逆時(shí)針方向旋轉(zhuǎn)。(4)輻合切變線是由經(jīng)過遼寧南下的東北風(fēng)與山東半島的西北風(fēng)(西風(fēng))輻合構(gòu)成;切變線受西風(fēng)分量減弱的影響而發(fā)生移動(dòng)。

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The EVAP technology was used to retrieve an ocean-effect snowstorm in Shangdong Peninsula on 30 December, 2010, in order to analyze the characteristics of radar echo and wind field at low level during snowstorm.Results show that the snowstorm did not take place simultaneously in Yantai and Weihai and the snowbelt moved eastward obviously, meanwhile, the corresponding strong echo zone gradually moved to east in Yantai, but kept stationary in Weihai. The strong radar echo started and weakened in the Bohai Sea, and the location of the strong echo zone corresponded well to the convergence zone of wind field. The movement of horizontal shear line of retrieval wind field led to the fluctation of strong echo zone. The shear line in northern Yantai was relatively stable, but in southern Yantai it gradually moved to west, which caused the strong echo zone to rotate clockwise;the shear line in southern Weihai was relatively stable, but in northern Weihai it gradually moved to west, which caused the strong echo zone to rotate counterclockwise. The convergence of northeast wind crossing Liaoning province and the northwest(west)wind in Shangdong Peninsula brought about the shear line, whose movement was affected by the weakening west wind component.

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王琪,楊成芳,王俊.一次大范圍海效應(yīng)暴雪的雷達(dá)反演風(fēng)場(chǎng)分析.氣象科學(xué),2015,35(5):653-661 WANG QI, YANG Chengfang, WANG Jun. Analysis on radar wind field retrieval of a snowstorm derived from ocean-effect. Journal of the Meteorological Sciences,2015,35(5):653-661

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收稿日期:2014-03-04
最后修改日期:2014-09-05
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在線發(fā)布日期: 2015-11-13
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