移出型西南渦與我國(guó)中東部降水的關(guān)系

doi:10.3969/2018jms.0084

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移出型西南渦與我國(guó)中東部降水的關(guān)系
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                        10.3969/2018jms.0084
                    
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基金項(xiàng)目:安徽省氣象局預(yù)報(bào)員專(zhuān)項(xiàng)資助項(xiàng)目（kY201611）；中國(guó)氣象局預(yù)報(bào)員專(zhuān)項(xiàng)資助項(xiàng)目（CMAYBY2018-033）

Statistical characteristics of moving-out southwest vortex and correlation between vortex and precipitation in central and eastern China

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利用常規(guī)觀測(cè)資料、逐日降水和NCEP再分析資料等統(tǒng)計(jì)2007-2017年5-7月西南渦共計(jì)199例，其中110例移出源地發(fā)展。在移出型西南渦中有66例沿偏東路徑移動(dòng)，占比60%；東北路徑西南渦約占28.2%；東南路徑西南渦僅占10.9%。移出型西南渦與我國(guó)中東部降水具有密切關(guān)系：偏東型有利于沿江地區(qū)降水增多；東北型使江北大部分地區(qū)降水增加；東南型有利于華南地區(qū)降水增加。偏東型和東北型西南渦中心路徑與雨帶走向近乎平行，但存在不同程度的偏移，造成偏移差異的直接原因在于低渦北側(cè)是否有降水。研究表明：當(dāng)高空無(wú)干冷侵入時(shí)，低渦南側(cè)偏南風(fēng)越強(qiáng)，北側(cè)空氣濕度越大，北側(cè)低空有偏東氣流將有利于北側(cè)空氣抬升產(chǎn)生降水；當(dāng)高空存在干冷侵入時(shí)，若北側(cè)低層有一支濕潤(rùn)的偏東氣流，二者疊加形成對(duì)流不穩(wěn)定，也有利于降水。

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Based on several kinds of observed statistics and reanalysis data, the characteristics of moving-out southwest vortex from 2007 to 2017, and their effect to precipitation in central and eastern China were studied. There were 199 southwest vortices, of which 110 cases moved out of the origin in different paths. Among the 110 moving-out southeast vortices, 60% moved in eastward path, 28.2% in northeast path, and only 10.9% in southeast path. Precipitation in central and eastern China was closely related to moving-out southwest vortex. It was proved that the precipitation was heavier in regions along the Yangtze River during the life circle of eastward-vortex. During northeast-moving vortex's life time, the precipitation increased in most area of north of Yangtze River. Coincidently, the precipitation in South China was heavier when vortex moving in southeast path. The routines of centers of vortices in eastward and northeast ways were nearly parallel to the axis of their rain bands, but not coincided. The direct cause of the deviation difference is whether there is precipitation on the north side of the vortex. Study showed, without dry and cold invasion at upper air, the stronger the southerly wind on the south side of the vortex was, the more humid the air on the north side. By this time, a low-level easterly air flow on the north side of vortex center may be conducive to the air uplift and local precipitation. When dry and cold invasion existed at upper air, a low-level easterly moist air flow may arouse convective instability, and this was also in favor of precipitation on the north side.

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吳瑞姣,羅艷,余金龍.移出型西南渦與我國(guó)中東部降水的關(guān)系.氣象科學(xué),2019,39(6):818-826 WU Ruijiao, LUO Yan, YU Jinlong. Statistical characteristics of moving-out southwest vortex and correlation between vortex and precipitation in central and eastern China. Journal of the Meteorological Sciences,2019,39(6):818-826

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收稿日期:2018-07-04
最后修改日期:2018-10-10
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在線發(fā)布日期: 2020-01-07
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抽查舔水白紧大视频,冲喜娘子超甜哒激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说